Between brackets is the number of accepted species
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- Biota
- Kingdom Animalia
- Kingdom Archaea
- Kingdom Bacteria
- Kingdom Chromista
- Kingdom Fungi
- Kingdom Plantae
- Phylum Acritarcha †
- Phylum Algae (awaiting allocation)
- Phylum Algae incertae sedis
- Phylum Anthocerotophyta
- Phylum Bryophyta
- Phylum Calcitarcha †
- Phylum Charophyta
- Phylum Chlorophyta
- Phylum Eophyta †
- Phylum Glaucophyta
- Phylum Gymnospermophyta accepted as Tracheophyta
- Phylum Horneophyta †
- Phylum Magnoliophyta accepted as Tracheophyta
- Phylum Marchantiophyta
- Phylum Picozoa
- Phylum Plantae (awaiting allocation)
- Phylum Prasinodermatophyta
- Phylum Pteridophyta accepted as Tracheophyta
- Phylum Rhodelphidia
- Phylum Rhodophyta
- Phylum Sporae dispersae †
- Phylum Tracheophyta
- Subdivision Lycopodiophytina
- Subdivision Polypodiophytina
- Subdivision Spermatophytina
- Superclass Angiospermae
- Class Liliopsida accepted as Magnoliopsida
- Class Magnoliopsida
- Order Acorales
- Order Adoxales accepted as Dipsacales
- Order Alismatales
- Order Alstroemeriales accepted as Liliales
- Order Amaryllidales accepted as Asparagales
- Order Amborellales
- Order Apiales
- Order Apocynales accepted as Gentianales
- Order Aquifoliales
- Order Arales accepted as Alismatales
- Order Araliales accepted as Apiales
- Order Aralidiales accepted as Apiales
- Order Arecales
- Order Aristolochiales accepted as Piperales
- Order Asparagales
- Family Agapanthaceae F. Voigt, 1850 accepted as Amaryllidaceae J. Saint-Hilaire, 1805
- Family Agavaceae Dumortier, 1829 accepted as Asparagaceae de Jussieu, 1789
- Family Alliaceae Borkhausen, 1797 accepted as Amaryllidaceae J. Saint-Hilaire, 1805
- Family Aloaceae Batsch, 1802 accepted as Asphodelaceae de Jussieu, 1789
- Family Aloeaceae accepted as Asphodelaceae de Jussieu, 1789
- Family Amaryllidaceae J. Saint-Hilaire, 1805
- Family Anthericaceae J.G. Agardh, 1858 accepted as Asparagaceae de Jussieu, 1789
- Family Aphyllanthaceae Burnett, 1835 accepted as Asparagaceae de Jussieu, 1789
- Family Asparagaceae de Jussieu, 1789
- Family Asparagales (awaiting allocation)
- Family Asphodelaceae de Jussieu, 1789
- Family Asteliaceae Dumortier, 1829
- Family Blandfordiaceae R. Dahlgren & Clifford, 1985
- Family Boryaceae M.W. Chase, Rudall & Conran, 1997
- Family Convallariaceae Horaninow, 1834 accepted as Asparagaceae de Jussieu, 1789
- Family Cyanastraceae Engler, 1900 accepted as Tecophilaeaceae Leybold, 1862
- Family Dianellaceae Salisbury, 1866 accepted as Asphodelaceae de Jussieu, 1789
- Family Doryanthaceae R. Dahlgren & Clifford, 1985
- Family Dracaenaceae Salisbury, 1866 accepted as Asparagaceae de Jussieu, 1789
- Family Eriospermaceae Lemaire, 1845 accepted as Asparagaceae de Jussieu, 1789
- Family Geosiridaceae Jonker, 1939 accepted as Iridaceae de Jussieu, 1789
- Family Hemerocallidaceae R. Brown, 1810 accepted as Asphodelaceae de Jussieu, 1789
- Family Herreriaceae Kunth, 1850 accepted as Asparagaceae de Jussieu, 1789
- Family Hesperocallidaceae Traub, 1972 accepted as Asparagaceae de Jussieu, 1789
- Family Hostaceae B. Mathew, 1988 accepted as Asparagaceae de Jussieu, 1789
- Family Hyacinthaceae Batsch ex Borkhausen, 1797 accepted as Asparagaceae de Jussieu, 1789
- Family Hypoxidaceae R. Brown, 1814
- Family Iridaceae de Jussieu, 1789
- Family Isophysidaceae F. A. Barkley, 1948 accepted as Iridaceae de Jussieu, 1789
- Family Ixioliriaceae Nakai, 1943
- Family Lanariaceae H. Huber ex R. Dahlgren, 1988
- Family Laxmanniaceae Bubani, 1902 accepted as Asparagaceae de Jussieu, 1789
- Family Lomandraceae Lotsy, 1911 accepted as Asparagaceae de Jussieu, 1789
- Family Nolinaceae Nakai, 1943 accepted as Asparagaceae de Jussieu, 1789
- Family Ophiopogonaceae Meissner, 1842 accepted as Asparagaceae de Jussieu, 1789
- Family Orchidaceae de Jussieu, 1789
- Genus Aa H.G. Reichenbach, 1854
- Genus Abaxianthus M.A. Clements & D.L. Jones, 2002 accepted as Dendrobium O. Swartz, 1799
- Genus Abdominea J.J. Smith, 1914
- Genus Aberconwayara J.M.H. Shaw, 2011
- Genus Abola Lindley, 1853 accepted as Caucaea Schlechter, 1920
- Genus Abrochis Necker ex Rafinesque, 1838
- Genus Acacallis Lindley, 1853 accepted as Aganisia J. Lindley, 1839
- Genus Acampe Lindley, 1853
- Genus Acampodorum J.M.H. Shaw, 2003
- Genus Acampoglottis M. Chanyangam, 2024
- Genus Acanthephippium C.L. von Blume ex S.F.L. Endlicher, 1837
- Genus Acanthoglossum Blume, 1825 accepted as Pholidota Lindley ex W.J. Hooker, 1825
- Genus Acanthophippium Blume, 1825 accepted as Acanthephippium C.L. von Blume ex S.F.L. Endlicher, 1837
- Genus Acapetalum Hort. ex J.M.H. Shaw, 2013
- Genus Acemannia J.M.H. Shaw, 2018
- Genus Aceraherminium E.G. Camus, 1929
- Genus Aceras R. Brown in W.T. Aiton, 1813 accepted as Orchis Linnaeus, 1753
- Genus Acerasherminium Gremli, 1883
- Genus Aceratoglossum F.M. Vázquez, 2009 accepted as Orchimantoglossum P. Ascherson & P. Graebner, 1907
- Genus Aceratorchis Schlechter in Limpricht, 1922
- Genus Achlydosa M.A. Clements & D.L. Jones, 2002 accepted as Megastylis (Schlechter) Schlechter, 1911
- Genus Achroanthes Rafinesque, 1819 accepted as Malaxis Solander ex O. Swartz, 1788
- Genus Acianthella D.L. Jones & M.A. Clements, 2004 accepted as Acianthus R. Brown, 1810
- Genus Acianthera Scheidweiler, 1842 accepted as Pleurothallis R. Brown in W.T. Aiton, 1813
- Genus Acianthopsis M.A. Clements & D.L. Jones, 2002 accepted as Acianthus R. Brown, 1810
- Genus Acianthopsis D.L. Szlachetko, 2002 accepted as Acianthus R. Brown, 1810
- Genus Acianthus R. Brown, 1810
- Genus Acinbreea Hort., 1985
- Genus Acineta J. Lindley, 1843
- Genus Aciopea G. Gaviria-Correa, 2005
- Genus Ackermania C.H. Dodson & R. Escobar, 1993
- Genus Aclinia W. Griffith, 1851 accepted as Dendrobium O. Swartz, 1799
- Genus Acoidium J. Lindley, 1837 accepted as Trichocentrum Poeppig & Endlicher, 1836
- Genus Acoridium C.G.D. Nees & F.J.F. Meyen in F.J.F. Meyen, 1843 accepted as Dendrochilum Blume, 1825
- Genus Acostaea Schlechter, 1923
- Genus Acraea Lindley in Bentham, 1845 accepted as Pterichis Lindley, 1840
- Genus Acriopsis Blume, 1825
- Genus Acroanthes C.S. Rafinesque, 1819 accepted as Malaxis Solander ex O. Swartz, 1788
- Genus Acrochaene Lindley, 1853
- Genus Acrolophia Pfitzer, 1887
- Genus Acronia K.B. Presl, 1827 accepted as Pleurothallis R. Brown in W.T. Aiton, 1813
- Genus Acropera J. Lindley, 1833 accepted as Gongora Ruiz & Pavon, 1794
- Genus Acrorchis R.L. Dressler, 1990
- Genus Acrostylia Frappier ex E. Jacob de Cordemoy, 1895 accepted as Cynorkis Du Petit-Thouars, 1809
- Genus Ada Lindley, 1854
- Genus Adachilum J.M.H. Shaw, 2009
- Genus Adacidium Hort., 1990
- Genus Adactylus (Endlicher) Rolfe, 1896 accepted as Apostasia Blume, 1825
- Genus Adaglossum Hort., 1913
- Genus Adamantinia C. Van den Berg & C.N. Gonçalves, 2004
- Genus Adamara A. Cogniaux, 1911
- Genus Adapasia Hort., 1997
- Genus Adelopetalum R.D. Fitzgerald, 1891 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Adeneleuterophora Barbosa Rodrigues, 1881 accepted as Elleanthus K.B. Presl, 1827
- Genus Adeneleuthera O. Kuntze in Post & O. Kuntze, 1903
- Genus Adenocalpa J.M.H. Shaw, 2015
- Genus Adenochilus J.D. Hooker, 1853
- Genus Adenoncos Blume, 1825
- Genus Adenostylis Blume, 1825 accepted as Zeuxine Lindley, 1826
- Genus Adioda Hort., 1911
- Genus Adipe Rafinesque, 1837
- Genus Adnula Rafinesque, 1837 accepted as Pelexia Poiteau ex Lindley, 1826
- Genus Adoglossum Hort., 1913
- Genus Adonclioda J.M.H. Shaw, 2009
- Genus Adoncostele J.M.H. Shaw, 2010
- Genus Adrorhizon J.D. Hooker in Trimen, 1898
- Genus Aenhenrya R. Gopalan, 1994
- Genus Aenigma (Luer) D.L. Szlachetko & M. Kolanowska in Szlachetko et al., 2022 accepted as Aletheia Z. Feng, 2023
- Genus Aeonia J. Lindley, 1824 accepted as Oeonia J. Lindley, 1824
- Genus Aerachnochilus J.M.H. Shaw, 2010
- Genus Aerangaeris Hort., 2001
- Genus Aeranganthes J.M.H. Shaw, 2013
- Genus Aerangis H.G. Reichenbach, 1865
- Genus Aërangis H.G. Reichenbach, 1865 represented as Aerangis H.G. Reichenbach, 1865
- Genus Aerangopsis J.M.H. Shaw, 2019
- Genus Aeranthes J. Lindley, 1824
- Genus Aeranthus J. Lindley ex Sprengel accepted as Aeranthes J. Lindley, 1824
- Genus Aerasconetia Hort., 1978
- Genus Aeridachnanathe L.A. Garay & H.R. Sweet in C.L. Withner, 1974 accepted as Aeridachnanthe L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Aeridachnanthe L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Aeridachnis Hort., 1954
- Genus Aeridanthe L.A. Garay & H.R. Sweet, 1966
- Genus Aerides Loureiro, 1790
- Genus Aeridisia Hort., 1974
- Genus Aeriditis Hort., 1973
- Genus Aeridium R.A. Salisbury, 1812 accepted as Aerides Loureiro, 1790
- Genus Aeridocentrum Hort., 1967
- Genus Aeridochilus Hort., 1976
- Genus Aeridofinetia Hort., 1961
- Genus Aeridoglossum Hort., 1963
- Genus Aeridoglottis Hort., 1992
- Genus Aeridolabium Hort., 1959
- Genus Aeridopsis Hort., 1938
- Genus Aeridopsisanthe L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Aeridostachya (J.D. Hooker) F.G. Brieger in F.G. Brieger et al., 1981 accepted as Eria J. Lindley, 1825
- Genus Aeridostylis A.D. Hawkes, 1961
- Genus Aeridovanda Colman, 1918
- Genus Aeridovanisia Hort., 1983
- Genus Aeridsonia C.T. Wong, 2010
- Genus Aeristoma M. Chanyangam, 2020
- Genus Aeristomanda J.M.H. Shaw, 2013
- Genus Aerobion K.P.J. Sprengel, 1826 accepted as Angraecum Bory de St.-Vincent, 1804
- Genus Aeroeonia J. Knecht, 2013
- Genus Aetheria S.F.L. Endlicher, 1837 accepted as Stenorrhynchos L.C. Richard ex K.P.J. Sprengel, 1826
- Genus Afropectinariella M. Simo-Droissart & T. Stévart in Simo-Droissart et al., 2018
- Genus Agananthes Hort., 1998
- Genus Aganella J.M.H. Shaw, 2010
- Genus Aganisia J. Lindley, 1839
- Genus Aganopeste J.M.H. Shaw, 2005
- Genus Aganopeste J.M.H. Shaw, 2004 accepted as Aganopeste J.M.H. Shaw, 2005
- Genus Aganulophia J.M.H. Shaw, 2018
- Genus Agasepalum Hort., 2001
- Genus Aggeianthus R. Wight, 1851 accepted as Porpax J. Lindley, 1845
- Genus Aglossorhyncha Schlechter accepted as Aglossorrhyncha Schlechter in K.M. Schumann & Lauterbach, 1905
- Genus Aglossorrhyncha Schlechter in K.M. Schumann & Lauterbach, 1905
- Genus Agrostophyllum Blume, 1825
- Genus Aitkenara Hort., 1979
- Genus Ala D.L. Szlachetko, 1995
- Genus Alamania Lexarza, 1824
- Genus Alantuckerara R. Tucker, J.M.H. Shaw & H. Griffits, 2002
- Genus Alatiliparis H.B. Margońska & D.L. Szlachetko, 2001 accepted as Liparis L.C. Richard, 1817
- Genus Alcockara J.M.H. Shaw, 2008
- Genus Aletheia Z. Feng, 2023
- Genus Alexanderara Hort., 1983
- Genus Aliceara Hort., 1964
- Genus Alipsa Hoffmannsegg, 1842 accepted as Liparis L.C. Richard, 1817
- Genus Alipsea Hoffmannsegg accepted as Alipsa Hoffmannsegg, 1842
- Genus Alismorchis L.M.A. du P. Thouars, 1822
- Genus Alismorkis L.M.A.A. Du Petit-Thouars, 1809 accepted as Calanthe R. Brown, 1821
- Genus Allenara Hort., 1975
- Genus Allenblackara A. Black & J.M.H. Shaw, 2022
- Genus Allochilus Gagnepain, 1932 accepted as Goodyera R. Brown in W.T. Aiton, 1813
- Genus Alphonsoara Hort., 1988
- Genus Altensteinia Kunth in Humboldt, Bonpland & Kunth, 1816
- Genus Alvisia Lindley, 1859 accepted as Eria J. Lindley, 1825
- Genus Amalia H.G.L. Reichenbach, 1841 accepted as Laelia J. Lindley, 1831
- Genus Amblostoma Scheidweiler, 1838 accepted as Encyclia W.J. Hooker, 1828
- Genus Amblyanthe S. Rauschert, 1983 accepted as Dendrobium O. Swartz, 1799
- Genus Amblyanthus (Schlechter) F.G. Brieger in F.G. Brieger et al., 1981 accepted as Dendrobium O. Swartz, 1799
- Genus Amblyglottis Blume, 1825 accepted as Calanthe R. Brown, 1821
- Genus Ambrella H. Perrier de la Bâthie, 1934
- Genus Amenopsis C.C. Tsai, 2009
- Genus Amerorchis E. Hultén, 1968
- Genus Amesangis L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Amesara L.A. Garay & H.R. Sweet, 1966
- Genus Amesia A. Nelson & Macbride, 1913 accepted as Epipactis Zinn, 1757
- Genus Amesiella Schlechter ex Garay, 1972
- Genus Amesilabium J.M.H. Shaw, 2003
- Genus Amitostigma Schlechter, 1919
- Genus Amoana C.L. Leopardi Verde & G. Carnevali, 2012
- Genus Amparoa Schlechter, 1923
- Genus Amphigena Rolfe in Thiselton-Dyer, 1913 accepted as Disa P.J. Bergius, 1767
- Genus Amphiglottis R.A. Salisbury ex N.L. Britton & P. Wilson, 1924 accepted as Epidendrum Linnaeus, 1763
- Genus Amphorchis L.M.A. du P. Thouars, 1822 accepted as Cynorkis Du Petit-Thouars, 1809
- Genus Amphorkis L.M.A.A. Du Petit-Thouars, 1809
- Genus Anabaranthe L. Glicenstein, 2012
- Genus Anabarlia J.M.H. Shaw, 2005
- Genus Anacampaludorchis P. Delforge, 2009 accepted as Anacamptis L.C. Richard, 1817
- Genus Anacampterorchis P. Delforge, 2009 accepted as Anacamptis L.C. Richard, 1817
- Genus Anacampteulenia P. Delforge, 2009 accepted as Anacamptis L.C. Richard, 1817
- Genus Anacamptiplatanthera P. Fournier, 1927
- Genus Anacampti-Platanthera P. Fournier, 1927 accepted as Anacamptiplatanthera P. Fournier, 1927
- Genus Anacamptis L.C. Richard, 1817
- Genus Anacamptorchis E.G. Camus, 1892
- Genus Anacampt-orchis E.G. Camus, 1892 accepted as Anacamptorchis E.G. Camus, 1892
- Genus Anacheilium H.G.L. Reichenbach ex Hoffmannsegg, 1842 accepted as Epidendrum Linnaeus, 1763
- Genus Anagymnorhiza J.M.H. Shaw, 2005
- Genus Anamantoglossum J.M.H. Shaw, 2014
- Genus Anaphora Gagnepain, 1932
- Genus Anaphorkis M.F. Bourdon & J.M.H. Shaw, 2004
- Genus Anathallis Barbosa Rodrigues, 1877
- Genus Ancistrochilus Rolfe in Thiselton-Dyer, 1897
- Genus Ancistrolanthe C.G. Wilson, 2016
- Genus Ancistrorhynchus Finet, 1907
- Genus Andersonara J.M.H. Shaw, 2009
- Genus Andinia (C.A. Luer) C.A. Luer, 2000
- Genus Andinorchis D.L. Szlachetko, J. Mytnik-Ejsmont & M. Górniak, 2006
- Genus Andreara A. De Prins, 2009
- Genus Andreettaea C.A. Luer, 1978
- Genus Andreettara J.M.H. Shaw, 2004
- Genus Andrewara Hort., 1984
- Genus Andrewckara J.M.H. Shaw, 2011
- Genus Androchilus Liebman ex C.J. Hartman, 1844 accepted as Ponthieva R. Brown in W.T. Aiton, 1813
- Genus Androcorys Schlechter, 1919
- Genus Androgyne W. Griffith, 1851 accepted as Panisea (Lindley) Lindley, 1854
- Genus Androrchis D. Tyteca & E. Klein, 2008 accepted as Orchis Linnaeus, 1753
- Genus Androrhiza P. Delforge, 2021 accepted as Orchidactylorhiza R. Soó & O. Borsos, 1966
- Genus Andyara A. Chen & J.M.H .Shaw, 2020
- Genus Anecochilus Blume, 1825 accepted as Anoectochilus Blume, 1825
- Genus Anectochilus C.L. von Blume, 1858-1859 accepted as Anoectochilus Blume, 1825
- Genus Anettea D.L. Szlachetko & J. Mytnik-Ejsmont, 2006 accepted as Gomesa R. Brown in J. Sims, 1815
- Genus Angellea L. Glicenstein, 2009
- Genus Angida H.F. Oakeley, 2003
- Genus Anglyda H.F. Oakeley, 2003
- Genus Angorchis L.M.A. du P. Thouars, 1809 accepted as Angraecum Bory de St.-Vincent, 1804
- Genus Angorchis C.G.D. Nees von Esenbeck, 1826
- Genus Angorkis Du Petit-Thouars, 1809
- Genus Angraecentrum Hort., 1978
- Genus Angraecoides (E. Jacob de Cordemoy) D.L. Szlachetko, J. Mytnik-Ejsmont & E. Grochocka, 2013 accepted as Angraecum Bory de St.-Vincent, 1804
- Genus Angraeconopsis J.M.H. Shaw, 2013
- Genus Angraecopsis Kraenzlin, 1900
- Genus Angraecopsis J.M.H. Shaw, 2013 accepted as Angraeconopsis J.M.H. Shaw, 2013
- Genus Angraecostylis Hort., 1982
- Genus Angraecum Bory de St.-Vincent, 1804
- Genus Angraecyrtanthes Hort., 1991
- Genus Angraeorchis Hort., 1974
- Genus Angrandostylis J.M.H. Shaw, 2018
- Genus Angrangis Hort., 1972
- Genus Angranthellea Hort., 1988
- Genus Angranthes Hort., 1975
- Genus Angreoniella Hort., 1987
- Genus Angularia J. Portilla, 2016 accepted as Maxiluloa U.B. Deshmukh & J.M.H. Shaw, 2021
- Genus Anguloa Ruiz & Pavon, 1794
- Genus Angulocaste Hort., 1906
- Genus Ania J. Lindley, 1831 accepted as Tainia Blume, 1825
- Genus Anikaara J.M.H. Shaw, 2007
- Genus Anisopetala (F.W.L. Kraenzlin) M.A. Clements, 2003 accepted as Dendrobium O. Swartz, 1799
- Genus Anisopetalon W.J. Hooker, 1825
- Genus Anisopetalum W.J. Hooker, 1825 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Anistylis Rafinesque, 1825 accepted as Liparis L.C. Richard, 1817
- Genus Ankersmitara J.M.H. Shaw, 2007
- Genus Ankylocheilos Summerhayes, 1943 accepted as Taeniophyllum Blume, 1825
- Genus Anneliesia F.G. Brieger & E. Lückel, 1983 accepted as Miltonia J. Lindley, 1837
- Genus Anocheile J.C. von Hoffmannsegg ex H.G.L. Reichenbach, 1841 accepted as Epidendrum Linnaeus, 1763
- Genus Anochilus (Schlechter) Rolfe in Thiselton-Dyer, 1913 accepted as Pterygodium O. Swartz, 1800
- Genus Anoectochilus Blume, 1825
- Genus Anoectomaria R.A. Rolfe, 1887
- Genus Anota (Lindley) Schlechter, 1914 accepted as Rhynchostylis Blume, 1825
- Genus Ansecymphyllum L.H. Chen, 2013
- Genus Anselangis J.M.H. Shaw, 2013
- Genus Ansellia J. Lindley, 1844
- Genus Ansidium Hort., 1966
- Genus Anteriocamptis P. Delforge, 2009 accepted as Anacamptis L.C. Richard, 1817
- Genus Anterioherorchis P. Delforge, 2009 accepted as Anacamptis L.C. Richard, 1817
- Genus Anteriomeulenia P. Delforge, 2009 accepted as Anacamptis L.C. Richard, 1817
- Genus Anteriopaludorchis P. Delforge, 2009 accepted as Anacamptis L.C. Richard, 1817
- Genus Anteriorchis E. Klein & D. Strack in D. Strack et al., 1989
- Genus Anterioserapias P. Delforge, 2009 accepted as Serapicamptis Godfery, 1921
- Genus Antheglottis L.A. Garay & H.R. Sweet, 1966
- Genus Antheranthe L.A. Garay & H.R. Sweet, 1966
- Genus Anthericlis Rafinesque, 1819 accepted as Tipularia Nuttall, 1818
- Genus Anthogonium Wallich ex J. Lindley, 1840
- Genus Anthogyas C.S. Rafinesque, 1838 accepted as Bletia Ruiz & Pavón, 1794
- Genus Anthosiphon Schlechter, 1920 accepted as Cryptocentrum Bentham, 1880
- Genus Anticheirostylis R.D. Fitzgerald, 1891 accepted as Prasophyllum R. Brown, 1810
- Genus Antillanorchis L.A. Garay in L.A. Garay & J.E. Stacy, 1974
- Genus Aopla J. Lindley, 1834 accepted as Herminium Linnaeus, 1758
- Genus Aorchis P. Vermeulen, 1972 accepted as Galearis Rafinesque, 1833(?)
- Genus Apatales C.L. von Blume ex H.N. Ridley, 1886 accepted as Liparis L.C. Richard, 1817
- Genus Apation Blume ex H.R. Ridley, 1886 accepted as Liparis L.C. Richard, 1817
- Genus Apatoselis L.A. Garay, 1980 accepted as Stelis O. Swartz, 1800
- Genus Apatostelis L.A. Garay, 1980 accepted as Stelis O. Swartz, 1800
- Genus Apaturia J. Lindley, 1831 accepted as Pachystoma Blume, 1825
- Genus Apedium G.R. Chiron, A. Sambin & G.J. Braem, 2015 accepted as Selenipedium H.G. Reichenbach, 1854
- Genus Apetalanthe L.V. Averyanov & B.V. Truong in Averyanov et al., 2020
- Genus Apetalon R. Wight, 1851 accepted as Didymoplexis W. Griffith, 1843
- Genus Aphyllorchis Blume, 1825
- Genus Apista Blume, 1825 accepted as Podochilus Blume, 1825
- Genus Aplectrum (T. Nuttall) J. Torrey, 1826
- Genus Aplostellis A. Richard, 1828 accepted as Nervilia Commerson ex Gaudichaud-Beaupré in Freycinet, 1829
- Genus Aporodes (F.R.R. Schlechter) W. Suarez & J.E. Cootes, 2007 accepted as Eria J. Lindley, 1825
- Genus Aporodes (F.R.R. Schlechter) W. Suarez & J.E. Cootes, 2008 accepted as Eria J. Lindley, 1825
- Genus Aporopsis (F.R.R. Schlechter) M.A. Clements & D.L. Jones, 2002 accepted as Dendrobium O. Swartz, 1799
- Genus Aporostylis Rupp & Hatch, 1946
- Genus Aporum Blume, 1825 accepted as Dendrobium O. Swartz, 1799
- Genus Apostasia Blume, 1825
- Genus Appendicula Blume, 1825
- Genus Appendiculopsis (Schlechter) D.L. Szlachetko, 1995
- Genus Appletonara H. Griffits & J.M.H. Shaw, 2007
- Genus Appletonara J.M.H. Shaw, 2008
- Genus Aracampe Hort., 1977
- Genus Aracamunia G. Carnevali & I.M. Ramírez Morillo, 1989
- Genus Arachnadenia L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Arachnangraecum (F.R.R. Schlechter) D.L. Szlachetko, J. Mytnik-Ejsmont & E. Grochocka, 2013 accepted as Angraecum Bory de St.-Vincent, 1804
- Genus Arachnanthe Blume, 1828 accepted as Arachnis Blume, 1825
- Genus Arachnaria D.L. Szlachetko, 2003
- Genus Arachnis Blume, 1825
- Genus Arachnites F.W. Schmidt, 1793 accepted as Ophrys Linnaeus, 1753
- Genus Arachnocentron Hort., 2001
- Genus Arachnochilus J.M.H. Shaw, 2010
- Genus Arachnoglossum Hort., 1972
- Genus Arachnoglottis Hort., 1958
- Genus Arachnopapua R. Rice, 2019 accepted as Dimorphorchis Rolfe, 1919
- Genus Arachnopsirea J.M.H. Shaw, 2003
- Genus Arachnopsis Hort., 1939
- Genus Arachnostylis Hort., 1966
- Genus Arachnostynopsis T. Phornsawatchai, 2008
- Genus Aranda Hort., 1937
- Genus Aranthera R.E. Holttum, 1936
- Genus Archineottia S.C. Chen, 1979 accepted as Neottia Guettard, 1754
- Genus Archivea E.A. Christenson & R. Jenny, 1996
- Genus Arethusa Linnaeus, 1753
- Genus Arethusantha Finet, 1897
- Genus Arguellesara J.M.H. Shaw, 2013
- Genus Argyrimelia J.M.H. Shaw in Flores et al., 2018
- Genus Argyrorchis Blume, 1859 accepted as Macodes (Blume) J. Lindley, 1840
- Genus Arhynchium Lindley & Paxton, 1850 accepted as Armodorum Breda, 1829
- Genus Arietinum L.C. Beck, 1833 accepted as Cypripedium Linnaeus, 1753
- Genus Arisanorchis Hayata, 1914 accepted as Cheirostylis Blume, 1825
- Genus Aristolelea Loureiro accepted as Aristotelea Loureiro, 1790
- Genus Aristotelea Loureiro, 1790 accepted as Spiranthes L.C. Richard, 1817
- Genus Aristotleara J.M.H. Shaw, 2008
- Genus Arizara Hort., 1965
- Genus Armanda J.M.H. Shaw, 2003
- Genus Armandacentrum J.M.H. Shaw, 2003
- Genus Armocentron J.M.H. Shaw, 2003
- Genus Armochilus J.M.H. Shaw, 2003
- Genus Armodachnis A.D. Hawkes, 1957
- Genus Armodorum Breda, 1829
- Genus Arnedina H.G.L. Reichenbach, 1841 accepted as Arundina Blume, 1825
- Genus Arnottia A. Richard, 1828 accepted as Cynorkis Du Petit-Thouars, 1809
- Genus Arpophyllum Lexarza in La Llave & Lexarza, 1825
- Genus Arthrochilium (T. Irmisch) G. Beck von Mannagetta, 1890 accepted as Epipactis Zinn, 1757
- Genus Arthrochilus F. von Mueller, 1858
- Genus Arthurara J.M.H. Shaw, 2009
- Genus Artomeria Breda accepted as Eria J. Lindley, 1825
- Genus Artorima R.L. Dressler & G.E. Pollard, 1971
- Genus Arundina Blume, 1825
- Genus Asarca J. Lindley, 1827 accepted as Chloraea J. Lindley, 1827
- Genus Asarum F. Archila, 2014 accepted as Dendrobium O. Swartz, 1799
- Genus Ascandopsis Hort., 1975
- Genus Ascidieria G. Seidenfaden, 1984
- Genus Ascocampe J.M.H. Shaw, 2012
- Genus Ascocenda Hort., 1949
- Genus Ascocentrochilus J.M.H. Shaw, 2010
- Genus Ascocentropsis K. Senghas & H. Schildhauer, 2000
- Genus Ascocentrum Schlechter ex J.J. Smith, 1914
- Genus Ascochilopsis C.E. Carr, 1929
- Genus Ascochilus Ridley, 1896
- Genus Ascochilus Blume, 1828 accepted as Geodorum G. Jackson in H.C. Andrews, 1811
- Genus Ascocleinetia Hort., 1984
- Genus Ascocleiserides J.M.H. Shaw, 2010
- Genus Ascodenia L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Ascofadanda J.M.H. Shaw, 2004
- Genus Ascofinetia Hort., 1961
- Genus Ascogastisia Hort., 1985
- Genus Ascoglossum Schlechter, 1913
- Genus Ascoglottis Hort., 1983
- Genus Ascolabium S.S. Ying, 1977 accepted as Ascocentrum Schlechter ex J.J. Smith, 1914
- Genus Asconopsis Hort., 1968
- Genus Ascoparanthera J.M.H. Shaw, 2002
- Genus Ascorachnis Hort., 1967
- Genus Ascoralda J.M.H. Shaw, 2003
- Genus Ascorella L.A. Garay & H.R. Sweet, 1966
- Genus Ascorenanthochilus J.M.H. Shaw, 2010
- Genus Ascorhynopsis J.M.H. Shaw, 2002
- Genus Ascostomanda J.M.H. Shaw, 2013
- Genus Ascotainia Ridley, 1907 accepted as Tainia Blume, 1825
- Genus Ascovandanthe J.M.H. Shaw, 2008
- Genus Ascovandoritis Hort., 1969
- Genus Ashtonara J.M.H. Shaw, 2008
- Genus Aspacidopsis J.M.H. Shaw, 2011
- Genus Aspacidostele J.M.H. Shaw, 2011
- Genus Aspaleomnia J.M.H. Shaw, 2005
- Genus Aspaleomnia J.M.H. Shaw, 2004 accepted as Aspaleomnia J.M.H. Shaw, 2005
- Genus Aspasia J. Lindley, 1832
- Genus Aspasiopsis J.M.H. Shaw, 2005
- Genus Aspasiopsis J.M.H. Shaw, 2004 accepted as Aspasiopsis J.M.H. Shaw, 2005
- Genus Aspasium Hort., 1958
- Genus Aspegrenia Poeppig & Endlicher, 1836 accepted as Octomeria R. Brown in W.T. Aiton, 1813
- Genus Aspezia J.M.H. Shaw, 2003
- Genus Aspidogyne L.A. Garay, 1977
- Genus Aspioda Hort., 1990
- Genus Aspla H.G.L. Reichenbach, 1841 accepted as Herminium Linnaeus, 1758
- Genus Asplundara J.M.H. Shaw, 2011
- Genus Aspodonia Hort., 1980
- Genus Aspoglossum Hort., 1962
- Genus Aspomesa J.M.H. Shaw, 2005
- Genus Aspopsis J.M.H. Shaw, 2005
- Genus Aspopsis J.M.H. Shaw, 2004 accepted as Aspopsis J.M.H. Shaw, 2005
- Genus Aspostele J.M.H. Shaw, 2010
- Genus Astroglossus H.G. Reichenbach ex G. Bentham & J.D. Hooker, 1883 accepted as Stellilabium Schlechter, 1914
- Genus Ate Lindley, 1835 accepted as Habenaria Willdenow, 1805
- Genus Aucellia D.L. Szlachetko & M. Sitko, 2012 accepted as Maxillaria Ruiz & Pavon, 1794
- Genus Auliza J.K. Small, 1913 accepted as Epidendrum Linnaeus, 1763
- Genus Aulosepalum L.A. Garay, 1982
- Genus Aulostylis Schlechter, 1912 accepted as Calanthe R. Brown, 1821
- Genus Aurinocidium A. Romowicz & D.L. Szlachetko, 2006 accepted as Grandiphyllum A. Docha Neto, 2006
- Genus Australia J.M.H. Shaw, 2003
- Genus Australorchis F.G. Brieger in F.G. Brieger et al., 1981 accepted as Dendrobium O. Swartz, 1799
- Genus Auxopus Schlechter, 1900
- Genus Aviceps J. Lindley, 1838 accepted as Satyrium O. Swartz, 1800
- Genus Ayubara Hort., 1985
- Genus Azadehdelia G.J. Braem, 1988 accepted as Cribbia K. Senghas, 1985
- Genus Aziza J.N.M. Farminhão & T. D'haijère, 2020
- Genus Backhouseara H. Griffits & J.M.H. Shaw, 2007
- Genus Bakerara Hort., 1976
- Genus Balaguerara Hort., 1997
- Genus Baldwinara Hort., 1983
- Genus Balfourara J.M.H. Shaw, 2008
- Genus Ballantineara J.M.H. Shaw, 2008
- Genus Balmeara J.M.H. Shaw, 2008
- Genus Bambuseria A. Schuiteman, Y.P. Ng & H.Æ. Pedersen in Ng et al., 2018
- Genus Banfieldara Hort., 1982
- Genus Baptichilum J. Woodward, 2013
- Genus Bapticidium Hort., 1999
- Genus Baptiguezia E. Lorincz & J.M.H. Shaw, 2002
- Genus Baptikoa J.M.H. Shaw, 2004
- Genus Baptirettia Hort., 2002
- Genus Baptistoglossum Flockerzi & P.F. Hunt, 1993
- Genus Baptistonia Barbosa Rodrigues, 1877 accepted as Oncidium O. Swartz, 1800
- Genus Baptodia G. Staal & J.M.H. Shaw, 2004
- Genus Barangis Hort., 1982
- Genus Baraniara J.M.H. Shaw, 2007
- Genus Baravolia J.M.H. Shaw, 2013
- Genus Barbosaara Hort., 1975
- Genus Barbosella Schlechter, 1918
- Genus Barbrodria C.A. Luer, 1981
- Genus Barcatanthe J.M.H. Shaw, 2007
- Genus Barclia J.M.H. Shaw, 2007
- Genus Bardendrum Hort., 1962
- Genus Barkeranthe J.M.H. Shaw, 2007
- Genus Barkeria Knowles & Westcott, 1838
- Genus Barkleyadendrum J.M.H. Shaw, 2009
- Genus Barkonitis Hort., 1988
- Genus Barkorima L. Glicenstein, 2013
- Genus Barkronleya J.M.H. Shaw, 2008
- Genus Barlaceras E.G. Camus in A. Camus, 1924
- Genus Barlaea H.G. Reichenbach, 1876 accepted as Cynorkis Du Petit-Thouars, 1809
- Genus Barlia Parlatore, 1860 accepted as Himantoglossum K.P.J. Sprengel, 1826
- Genus Barnesara J.M.H. Shaw, 2008
- Genus Barombia Schlechter, 1914 accepted as Aerangis H.G. Reichenbach, 1865
- Genus Barombiella D.L. Szlachetko, 2003 accepted as Ypsilopus Summerhayes, 1949
- Genus Bartholina R. Brown in W.T. Aiton, 1813
- Genus Bartlettara J.M.H. Shaw, 2008
- Genus Basigyne J.J. Smith, 1917
- Genus Basiphyllaea Schlechter, 1921
- Genus Baskervilla J. Lindley, 1840
- Genus Batchmanara K. Batchman, 2022
- Genus Batemannia J. Lindley, 1834
- Genus Bateostylis Hort., 1967
- Genus Bathiea Schlechter, 1918 accepted as Neobathiea R. Schlechter, 1925
- Genus Baumannara Hort., 1983
- Genus Beadlea J.K. Small, 1903 accepted as Cyclopogon K.B. Presl, 1827
- Genus Beallara Hort., 1970
- Genus Beardara Hort., 1970
- Genus Beaumontara Hort., 1961
- Genus Beclardia A. Richard, 1828
- Genus Belgeara H. Griffits & J.M.H. Shaw, 2007
- Genus Beloglottis Schlechter, 1920
- Genus Bennett-poeara J.M.H. Shaw, 2008
- Genus Bensteinia E.A. Christenson, 2006 accepted as Bensteinia E.A. Christenson, 2010
- Genus Bensteinia E.A. Christenson, 2010
- Genus Benthamara L.A. Garay & H.R. Sweet, 1966
- Genus Benthamara Hort., 1974 accepted as Nashara Hort., 1974
- Genus Benthamia A. Richard, 1828
- Genus Benzingia C.H. Dodson, 1995 accepted as Benzingia C.H. Dodson, 2010
- Genus Benzingia C.H. Dodson, 1989 accepted as Benzingia C.H. Dodson, 2010
- Genus Benzingia C.H. Dodson, 2010
- Genus Beranekara H. Griffits & J.M.H. Shaw, 2007
- Genus Berlinerara L. Glicenstein, 2009
- Genus Bernardara J.M.H. Shaw, 2009
- Genus Bertara J.M.H. Shaw, 2007
- Genus Bettsara J.M.H. Shaw, 2009
- Genus Bhumipolara K. Kanchanawatee, 2011
- Genus Bhutanthera J. Renz in N. Pearce, P.J. Cribb & J. Renz, 2001
- Genus Bicchia Parlatore, 1860 accepted as Habenaria Willdenow, 1805
- Genus Bicornella J. Lindley, 1834 accepted as Cynorkis Du Petit-Thouars, 1809
- Genus Bidacaste J.M.H. Shaw, 2017
- Genus Bidoupia L.V. Averyanov, P.A. Ormerod & N.V. Duy, 2016
- Genus Bieneria H.G. Reichenbach, 1853 accepted as Chloraea J. Lindley, 1827
- Genus Biermannia G. King & R. Pantling, 1897
- Genus Bifolium Petiver ex Nieuwland, 1913 accepted as Listera R. Brown in W.T. Aiton, 1813
- Genus Bifranisia Hort., 1997
- Genus Bifrenaria J. Lindley, 1832
- Genus Bifrenidium Hort., 1988
- Genus Bifreniella Hort., 1989
- Genus Bifrinlaria Hortus in Lager & Hurrell, 1966
- Genus Bifuloa J.M.H. Shaw, 2023
- Genus Bilabrella J. Lindley, 1834 accepted as Habenaria Willdenow, 1805
- Genus Bilneyara J.M.H. Shaw, 2008
- Genus Biltonara Hort., 1994
- Genus Binotia Rolfe, 1905
- Genus Binotioda J.M.H. Shaw, 2007
- Genus Bipinnula Commerson ex A.L. Jussieu, 1789
- Genus Birchea A. Richard, 1841 accepted as Luisia Gaudichaud-Beaupré in Freycinet, 1829
- Genus Bishopara Hort., 1976
- Genus Blackara Hort., 1981
- Genus Bleitzara M. Bleitz, 2010
- Genus Blephariglotis Rafinesque, 1837 accepted as Blephariglottis Rafinesque, 1837
- Genus Blephariglottis Rafinesque, 1837 accepted as Platanthera L.C. Richard, 1817
- Genus Blepharochilum M.A. Clements & D.L. Jones, 2002 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Blepharoglossum (R. Schlechter) L. Li, 2020
- Genus Blepharopsis P.G. Efimov, 2009 accepted as Platanthera L.C. Richard, 1817
- Genus Bleteleorchis Maekawa, 1971
- Genus Bletia Ruiz & Pavón, 1794
- Genus Bletiaglottis Hort., 1999
- Genus Bletiana Rafinesque, 1818 accepted as Bletia Ruiz & Pavón, 1794
- Genus Bletilla H.G. Reichenbach, 1852-1853
- Genus Bletundina Maekawa, 1971
- Genus Bleuara J.M.H. Shaw, 2013
- Genus Bloomara Hort., 1966
- Genus Blumeara J.M.H. Shaw, 2011
- Genus Blumeorchis D.L. Szlachetko, 2003
- Genus Boelanara J.M.H. Shaw, 2014
- Genus Bogardara Hort., 1996
- Genus Bogoria J.J. Smith, 1905
- Genus Bohnhoffara J.M.H. Shaw, 2010
- Genus Bokchoonara Hort., 1977
- Genus Bolbicymbidium J.M.H. Shaw, 2011
- Genus Bolbidium (Lindley) F.G. Brieger in R. Schlechter, 1981 accepted as Dendrobium O. Swartz, 1799
- Genus Bolbidium (Lindley) Lindley, 1846 accepted as Maxillaria Ruiz & Pavon, 1794
- Genus Bolbophyllaria H.G. Reichenbach, 1852
- Genus Bolbophyllopsis H.G. Reichenbach, 1852 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Bolborchis Zollinger & Moritzi in Moritzi, 1846 accepted as Coelogyne J. Lindley, 1821?
- Genus Bollea H.G. Reichenbach, 1852
- Genus Bolleanthes Hort., 1993
- Genus Bolleochondrorhyncha A. Cogniaux, 1902 accepted as Bolleo-chondrorhyncha A. Cogniaux, 1902
- Genus Bolleo-chondrorhyncha A. Cogniaux, 1902
- Genus Bolleoscaphe J.M.H. Shaw, 2013
- Genus Bollopetalum Hort., 1989
- Genus Bolusiella Schlechter, 1918
- Genus Bonatea Willdenow, 1805
- Genus Bonniera E. Jacob de Cordemoy, 1899
- Genus Bonplandara J.M.H. Shaw, 2005
- Genus Bonplandara J.M.H. Shaw, 2004 accepted as Bonplandara J.M.H. Shaw, 2005
- Genus Bootara J.M.H. Shaw, 2007
- Genus Borwickara J.M.H. Shaw, 2008
- Genus Boryangraecum (F.R.R. Schlechter) D.L. Szlachetko, J. Mytnik-Ejsmont & E. Grochocka, 2013 accepted as Angraecum Bory de St.-Vincent, 1804
- Genus Bothriochilus Lemaire, 1856 accepted as Coelia Lindley, 1830
- Genus Bouletia M.A. Clements & D.L. Jones, 2002 accepted as Dendrobium O. Swartz, 1799
- Genus Bovornara Hort., 1975
- Genus Bowringara J.M.H. Shaw, 2008
- Genus Braasiella G.J. Braem, E. Lückel & M. Rüssmann, 1984 accepted as Oncidium O. Swartz, 1800
- Genus Brachionidium J. Lindley, 1859
- Genus Brachtia H.G. Reichenbach, 1850
- Genus Brachycorythis J. Lindley, 1838
- Genus Brachypeza Garay, 1972
- Genus Brachystele Schlechter, 1920
- Genus Brachystepis G.A. Pritzel, 1855 accepted as Oeonia J. Lindley, 1824
- Genus Bracisepalum J.J. Smith, 1933 accepted as Coelogyne J. Lindley, 1821?
- Genus Bradeara Hort., 1973
- Genus Bradriguezia W.W.G. Moir, 1957
- Genus Bradriquezia W.W.G. Moir, 1957 accepted as Bradriguezia W.W.G. Moir, 1957
- Genus Bradshawara J.M.H. Shaw, 2011
- Genus Braemia R. Jenny, 1985
- Genus Bramesa J.M.H. Shaw, 2009
- Genus Bramiltumnia J.M.H. Shaw, 2004 accepted as Bramiltumnia J.M.H. Shaw, 2005
- Genus Bramiltumnia J.M.H. Shaw, 2005
- Genus Brapacidium M.O. Carpenter & J.M.H. Shaw, 2002
- Genus Braparmesa J.M.H. Shaw, 2011
- Genus Brapasia W.W.G. Moir, 1957
- Genus Brasadastele J.M.H. Shaw, 2004 accepted as Brasadastele J.M.H. Shaw, 2005
- Genus Brasadastele J.M.H. Shaw, 2005
- Genus Brascidostele J.M.H. Shaw, 2004 accepted as Brascidostele J.M.H. Shaw, 2005
- Genus Brascidostele J.M.H. Shaw, 2005
- Genus Brasiliorchis R.B. Singer, S. Koehler & G. Carnevali, 2007
- Genus Brasolia (H.G. Reichenbach) P. Baranow, M. Dudek & D.L. Szlachetko, 2017
- Genus Brasophonia H. Griffits & J.M.H. Shaw, 2007
- Genus Brasophrolia J.M.H. Shaw, 2013
- Genus Brassacathron H. Griffits & J.M.H. Shaw, 2007
- Genus Brassada Hort., 1970
- Genus Brassanthe J.M.H. Shaw, 2003
- Genus Brassaphilanthe J.M.H. Shaw, 2018
- Genus Brassavola R. Brown in W.T. Aiton, 1813
- Genus Brassia R. Brown in W.T. Aiton, 1813
- Genus Brassidiocentrum J.M.H. Shaw, 2011
- Genus Brassidium Hort., 1948
- Genus Brassidomesa J.M.H. Shaw, 2011
- Genus Brassioda Hort., 1989
- Genus Brassiopsis D.L. Szlachetko & M. Górniak, 2006 accepted as Brassia R. Brown in W.T. Aiton, 1813
- Genus Brassocatanthe J.M.H. Shaw, 2004
- Genus Brassocattleya Hort., 1889
- Genus Brasso-cattleya Hort., 1889 accepted as Brassocattleya Hort., 1889
- Genus Brassochilum J.M.H. Shaw, 2004 accepted as Brassochilum J.M.H. Shaw, 2005
- Genus Brassochilum J.M.H. Shaw, 2005
- Genus Brassochilus Hort., 1979
- Genus Brassodiacrium Hort., 1915
- Genus Brassoepidendrum Hort., 1906
- Genus Brassoepilaelia Hort., 1978
- Genus Brassokeria Hort., 1980
- Genus Brassolaelia Hort., 1902
- Genus Brassolaeliocattleya Hort., 1906
- Genus Brassomicra Hort., 1994
- Genus Brassoncidopsis J.M.H. Shaw, 2011
- Genus Brassonitis Hort., 1962 accepted as Sophrovola G. Hansen, 1895
- Genus Brassophranthe J.M.H. Shaw, 2003
- Genus Brassophronitis H. Hottinger, 1954
- Genus Brassopsis J.M.H. Shaw, 2005
- Genus Brassopsis J.M.H. Shaw, 2004 accepted as Brassopsis J.M.H. Shaw, 2005
- Genus Brassopsycanthe J.M.H. Shaw, 2022
- Genus Brassostele J.M.H. Shaw, 2004 accepted as Brassostele J.M.H. Shaw, 2005
- Genus Brassostele J.M.H. Shaw, 2005
- Genus Brassotonia Hort., 1960
- Genus Bratonia W.W.G. Moir, 1957
- Genus Brenesia Schlechter, 1923 accepted as Pleurothallis R. Brown in W.T. Aiton, 1813
- Genus Brescansinara J.M.H. Shaw, 2019
- Genus Brevilongium E.A. Christenson, 2006
- Genus Brianara J.M.H. Shaw, 2003
- Genus Briegeria K. Senghas, 1980 accepted as Jacquiniella Schlechter, 1920
- Genus Briggs-buryara J.M.H. Shaw, 2008
- Genus Brilliandeara Hort., 1983
- Genus Broanthevola J.M.H. Shaw, 2008
- Genus Brolaelianthe J.M.H. Shaw, 2007
- Genus Brolarchilis J.M.H. Shaw, 2008
- Genus Bromecanthe J.M.H. Shaw, 2007
- Genus Bromheadia J. Lindley, 1841
- Genus Brongniartara J.M.H. Shaw, 2008
- Genus Broughtonia R. Brown in W.T. Aiton, 1813
- Genus Broughtopsis W.W.G. Moir, 1957
- Genus Brownara Hort., 1974
- Genus Brownleea W.H. Harvey ex J. Lindley, 1842
- Genus Brummittara Hort., 1978
- Genus Brymerara J.M.H. Shaw, 2011
- Genus Bryobium J. Lindley, 1836 accepted as Eria J. Lindley, 1825
- Genus Bryopinalia J.M.H. Shaw, 2013
- Genus Bucculina J. Lindley, 1837 accepted as Holothrix L.C. Richard ex J. Lindley, 1835
- Genus Buchtienia Schlechter, 1929
- Genus Buckmanara J.M.H. Shaw, 2013
- Genus Buesiella C. Schweinfurth, 1952
- Genus Buiara Hort., 1984
- Genus Bulbophyllaria S. Le M. Moore in Baker, 1877 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Bulbophyllopsis H.G. Reichenbach accepted as Bolbophyllopsis H.G. Reichenbach, 1852
- Genus Bulbophyllum Du Petit-Thouars, 1822
- Genus Bullara H. Griffits & J.M.H. Shaw, 2007
- Genus Bulleyia Schlechter, 1912 accepted as Coelogyne J. Lindley, 1821?
- Genus Burkhardtara Hort., 1987
- Genus Burkillara Hort., 1967
- Genus Burkinshawara J.M.H. Shaw, 2008
- Genus Burlingtonia J. Lindley, 1837 accepted as Rodriguezia Ruiz & Pavon, 1794
- Genus Burnettia J. Lindley, 1840
- Genus Burnsbaloghia D.L. Szlachetko, 1991 accepted as Deiregyne Schlechter, 1920
- Genus Burrageara Hort., 1927
- Genus Buyssonara J.M.H. Shaw, 2010
- Genus Cadetia Gaudichaud-Beaupré in Freycinet, 1829
- Genus Caelogyne J. Lindley, 1821? accepted as Coelogyne J. Lindley, 1821?
- Genus Cahuzacara J.M.H. Shaw, 2007
- Genus Caladenia R. Brown, 1810
- Genus Caladeniastrum (D.L. Szlachetko) D.L. Szlachetko, 2003 accepted as Caladenia R. Brown, 1810
- Genus Calanthe R. Brown, 1821
- Genus Calanthidium Pfitzer in Engler & Prantl, 1889 accepted as Calanthe R. Brown, 1821
- Genus Calanthidum Pfitzer accepted as Calanthe R. Brown, 1821
- Genus Calassodia M.A. Clements, 1989
- Genus Calawaya D.L. Szlachetko & M. Sitko, 2012 accepted as Maxillaria Ruiz & Pavon, 1794
- Genus Calcearia Blume, 1825 accepted as Corybas R.A. Salisbury, 1807
- Genus Calceolaria Heister ex Fabricius, 1763 accepted as Cypripedium Linnaeus, 1753
- Genus Calceolus P. Miller, 1754 accepted as Cypripedium Linnaeus, 1753
- Genus Caleana R. Brown, 1810
- Genus Caletilla J.M.H. Shaw, 2015
- Genus Caleya R. Brown, 1813 accepted as Caleana R. Brown, 1810
- Genus Calista Ritgen, 1831
- Genus Calliphyllon Bubani, 1901 accepted as Epipactis Zinn, 1757
- Genus Callista Loureiro, 1790 accepted as Dendrobium O. Swartz, 1799
- Genus Callistanthos D.L. Szlachetko, 2008 accepted as Pteroglossa Schlechter, 1920
- Genus Callithronum J.K. Ehrhart, 1789 accepted as Cephalanthera L.C. Richard, 1817
- Genus Callostylis Blume, 1825 accepted as Eria J. Lindley, 1825
- Genus Calnorchis J.M.H. Shaw, 2014
- Genus Caloarethusa Hort., 1990
- Genus Calochilus R. Brown, 1810
- Genus Caloglossum Schlechter, 1918 accepted as Cymbidiella Rolfe, 1918
- Genus Calomitra Hort., 1998
- Genus Calonema (J. Lindley) D.L. Jones & M.A. Clements, 2001
- Genus Calonema (J. Lindley) D.L. Szlachetko, 2001
- Genus Calopogon R. Brown in W.T. Aiton, 1813
- Genus Calorchis Barbosa Rodrigues, 1877 accepted as Ponthieva R. Brown in W.T. Aiton, 1813
- Genus Caluera C.H. Dodson & R.O. Determann, 1983
- Genus Calymmanthera Schlechter, 1913
- Genus Calypso R.A. Salisbury, 1807
- Genus Calypsodium Link, 1829 accepted as Calypso R.A. Salisbury, 1807
- Genus Calyptrochilum Kraenzlin, 1895
- Genus Camaridium J. Lindley, 1824
- Genus Camarotis Lindley, 1833 accepted as Micropera Lindley, 1832
- Genus Camelostalix Pfitzer & Kraenzlin in Engler, 1907 accepted as Pholidota Lindley ex W.J. Hooker, 1825
- Genus Camilleugenia Frappier ex E. Jacob de Cordemoy, 1895 accepted as Cynorkis Du Petit-Thouars, 1809
- Genus Campaccia D.H. Baptista, P.A. Harding & V.P. Castro, 2011 accepted as Gomesa R. Brown in J. Sims, 1815
- Genus Campanulorchis F.G. Brieger in F.G. Brieger et al., 1981 accepted as Eria J. Lindley, 1825
- Genus Campbellara Hort., 1979
- Genus Campylocentrum Bentham, 1881
- Genus Canacorchis Guillaumin, 1964 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Cannaeorchis M.A. Clements & D.L. Jones, 1998
- Genus Cannazzaroara J.M.H. Shaw, 2012
- Genus Capanemia J. Barbosa Rodrigues, 1877
- Genus Cappeara J.M.H. Shaw, 2007
- Genus Cardiochilos P.J. Cribb, 1977
- Genus Cardiophyllum J.K. Ehrhart, 1789 accepted as Listera R. Brown in W.T. Aiton, 1813
- Genus Carlwithnerara J.M.H. Shaw, 2013
- Genus Carmichaelara Hort., 1999
- Genus Carolara M. Blietz, 2015
- Genus Carolineleongara W.L. How, J. Elliot & J.M.H. Shaw, 2013
- Genus Carparomorchis M.A. Clements & D.L. Jones, 2002 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Carpenterara Hort., 1987
- Genus Carrara L.A. Garay & H.R. Sweet, 1966
- Genus Carriella V.P. Castro Neto & K.G. Lacerda, 2006
- Genus Carterara Hort., 1969
- Genus Carteretia A. Richard in Dumont d'Urville, 1834 accepted as Cleisostoma Blume, 1825
- Genus Carteria J.K. Small, 1910 accepted as Basiphyllaea Schlechter, 1921
- Genus Casoara Hort., 1980
- Genus Catachaetum J.C. von Hoffmannsegg, 1842 accepted as Catasetum L.C. Richard ex Kunth, 1822
- Genus Catachysis G. Brill, 2021
- Genus Catamodes Hort., 1967
- Genus Catanoches Hort., 1967
- Genus Catasandra Hort., 1987
- Genus Catasellia M. Chen & J.M.H. Shaw, 2003
- Genus Catasetum L.C. Richard ex Kunth, 1822
- Genus Catcattleyella J.M.H. Shaw, 2007
- Genus Catcaullia J.M.H. Shaw, 2008
- Genus Catcylaelia J.M.H. Shaw, 2004
- Genus Cathea R.A. Salisbury, 1812 accepted as Calopogon R. Brown in W.T. Aiton, 1813
- Genus Catminichea J.M.H. Shaw, 2008
- Genus Cattarthrophila J.M.H. Shaw, 2009
- Genus Cattkeria Hort., 1985
- Genus Cattleya J. Lindley, 1821 (?)
- Genus Cattleychea J.M.H. Shaw, 2005
- Genus Cattleychea J.M.H. Shaw, 2004 accepted as Cattleychea J.M.H. Shaw, 2005
- Genus Cattleychytonia J.M.H. Shaw, 2015
- Genus Cattleyodendrum Hort., 1898 accepted as Epicattleya Hort., 1889
- Genus Cattleyopsis Lemaire, 1853 accepted as Broughtonia R. Brown in W.T. Aiton, 1813
- Genus Cattleyopsisgoa Hort., 1967
- Genus Cattleyopsistonia Hort., 1966
- Genus Cattleytonia Hort., 1959
- Genus Cattlianthe J.M.H. Shaw, 2003
- Genus Cattotes Hort., 1982
- Genus Catyclia J.M.H. Shaw, 2004
- Genus Caucaea Schlechter, 1920
- Genus Caucaerettia J.M.H. Shaw, 2010
- Genus Cauchostele J.M.H. Shaw, 2004 accepted as Cauchostele J.M.H. Shaw, 2005
- Genus Cauchostele J.M.H. Shaw, 2005
- Genus Caucidium J.M.H. Shaw, 2005
- Genus Caucidium J.M.H. Shaw, 2004 accepted as Caucidium J.M.H. Shaw, 2005
- Genus Caucoglossum R.A. Culver, 2023
- Genus Caulaeliokeria P.A. Storm, 2010
- Genus Caularstedella J.M.H. Shaw, 2004 accepted as Caularstedella J.M.H. Shaw, 2005
- Genus Caularstedella J.M.H. Shaw, 2005
- Genus Caularthron Rafinesque, 1837
- Genus Cauldenclia H. Griffits & J.M.H. Shaw, 2007
- Genus Caulocattleya W.J. Dress, 1975
- Genus Caulrianitis J.M.H. Shaw, 2008
- Genus Caulrianvola H. Griffits & J.M.H. Shaw, 2007
- Genus Caulronleya J.M.H. Shaw, 2008
- Genus Caultonia H. Griffits & J.M.H. Shaw, 2004
- Genus Cautonleya H. Griffits & J.M.H. Shaw, 2007
- Genus Celatorchis (R. Rice) R. Rice, 2007 accepted as Solenangis Schlechter, 1918
- Genus Centranthera Scheidweiler in Otto & A.G. Dietrich, 1842 accepted as Pleurothallis R. Brown in W.T. Aiton, 1813
- Genus Centrochilus J.C. Schauer, 1843 accepted as Habenaria Willdenow, 1805
- Genus Centrogenium Schlechter, 1920 accepted as Eltroplectris Rafinesque, 1837
- Genus Centroglossa Barbosa Rodrigues, 1882
- Genus Centropetalum J. Lindley, 1838 accepted as Fernandezia Ruiz & Pavon, 1794
- Genus Centrosia A. Richard, 1828 accepted as Calanthe R. Brown, 1821
- Genus Centrosis O. Swartz ex Du Petit-Thouars, 1822 accepted as Calanthe R. Brown, 1821
- Genus Centrosis O. Swartz, 1829 accepted as Limodorum Boehmer in C.G. Ludwig, 1760
- Genus Centrostigma Schlechter, 1915
- Genus Cephalangraecum Schlechter, 1918 accepted as Ancistrorhynchus Finet, 1907
- Genus Cephalanthera L.C. Richard, 1817
- Species Cephalanthera austiniae (Gray) Heller
- Genus Cephalantheropsis Guillaumin, 1960
- Genus Cephalopactis P. Ascherson & P. Graebner, 1907
- Genus Cephalophrys W.H. Cox, 1912
- Genus Cephalorchis F.M. Vázquez, 2009
- Genus Cepobaculum M.A. Clements & D.L. Jones, 2002 accepted as Dendrobium O. Swartz, 1799
- Genus Ceporillia J.M.H. Shaw, 2003
- Genus Ceraia Loureiro, 1790 accepted as Dendrobium O. Swartz, 1799
- Genus Ceratandra Lindley in F.A. Bauer & Lindley, 1838
- Genus Ceratandropsis Rolfe in Thiselton-Dyer, 1913
- Genus Ceratium Blume, 1825 accepted as Eria J. Lindley, 1825
- Genus Ceratobium M.A. Clements & D.L. Jones, 2002 accepted as Dendrobium O. Swartz, 1799
- Genus Ceratocentron K. Senghas, 1989
- Genus Ceratochilus Blume, 1825
- Genus Ceratochilus G. Loddiges in C. Loddiges, 1829 accepted as Stanhopea Frost ex W.J. Hooker, 1829
- Genus Ceratograecum Hort., 1995
- Genus Ceratopetalorchis D.L. Szlachetko, M. Górniak & P. Tukallo, 2003
- Genus Ceratopsis J. Lindley, 1840 accepted as Epipogium Gmelin ex Borkhausen, 1792
- Genus Ceratosiella J.M.H. Shaw, 2003
- Genus Ceratostylis Blume, 1825
- Genus Cerochilus J. Lindley, 1854 accepted as Hetaeria Blume, 1825
- Genus Cestichis L.M.A.A. Du Petit-Thouars ex E. Pfitzer, 1887 accepted as Liparis L.C. Richard, 1817
- Genus Chadwickara G. Monnier & J.M.H. Shaw, 2004
- Genus Chaenanthe J. Lindley, 1838 accepted as Diadenium Poeppig & Endlicher, 1836
- Genus Chaetocephala Barbosa Rodrigues, 1882 accepted as Myoxanthus Poeppig & Endlicher, 1836
- Genus Chamaeangis Schlechter, 1918
- Genus Chamaeanthus Schlechter ex J.J. Smith, 1905
- Genus Chamaegastrodia Makino & F. Maekawa, 1935
- Genus Chamaeleorchis K. Senghas & E. Lückel in F.G. Brieger et al., 1997
- Genus Chamaerepes K.P.J. Sprengel, 1826 accepted as Herminium Linnaeus, 1758
- Genus Chamberlainara H. Griffits & J.M.H. Shaw, 2007
- Genus Chamelophyton Garay, 1974
- Genus Chamodenia E. Peitz, 1970
- Genus Chamorchis L.C. Richard, 1817
- Genus Changnienia Chien, 1935
- Genus Chapmanara J.M.H. Shaw, 2009
- Genus Charlesara J.M.H. Shaw & C.G. Wilson, 2016
- Genus Charlesknappara J.M.H. Shaw, 2013
- Genus Charlesworthara Hort., 1919
- Genus Charlesworthiara Hort., 1919 accepted as Charlesworthara Hort., 1919
- Genus Charlieara Hort., 1990
- Genus Chaseella Summerhayes, 1961
- Genus Chaseëlla Summerhayes, 1961 represented as Chaseella Summerhayes, 1961
- Genus Chaseopsis D.L. Szlachetko & M. Sitko, 2012 accepted as Maxillaria Ruiz & Pavon, 1794
- Genus Chaubardia H.G. Reichenbach, 1852
- Genus Chaubardianthes Hort., 2000
- Genus Chaubardiella L.A. Garay, 1969
- Genus Chaubewiczella J.M.H. Shaw, 2010
- Genus Chauliodon Summerhayes, 1943
- Genus Cheiradenia J. Lindley, 1853
- Genus Cheiropterocephalus Barbosa Rodrigues, 1877 accepted as Malaxis Solander ex O. Swartz, 1788
- Genus Cheirorchis C.E. Carr, 1932 accepted as Cordiglottis J.J. Smith, 1922
- Genus Cheirostylis Blume, 1825
- Genus Chelonanthera Blume, 1825 accepted as Pholidota Lindley ex W.J. Hooker, 1825
- Genus Chelonistele Pfitzer in Engler, 1907 accepted as Coelogyne J. Lindley, 1821?
- Genus Chelychocentrum J.M.H. Shaw, 2004 accepted as Chelychocentrum J.M.H. Shaw, 2005
- Genus Chelychocentrum J.M.H. Shaw, 2005
- Genus Chelycidium J.M.H. Shaw, 2004 accepted as Chelycidium J.M.H. Shaw, 2005
- Genus Chelycidium J.M.H. Shaw, 2005
- Genus Chelyella D.L. Szlachetko & M. Sitko, 2012 accepted as Maxillaria Ruiz & Pavon, 1794
- Genus Chelyopsis J.M.H. Shaw, 2004
- Genus Chelyorchis R.L. Dressler & N.H. Williams, 2000
- Genus Chelystachya J. Mytnik-Ejsmont & D.L. Szlachetko, 2011 accepted as Polystachya W.J. Hooker, 1824
- Genus Chenara C.C. Tsai, 2009
- Genus Chenlanara C.C. Tsai, 2015
- Genus Chenorchis Z.J. Liu, J.J. Chen, K.W. Liu, L.Q. Li, X.Y. Ma & W.H. Rao, 2008
- Genus Chewara Hort., 1973
- Genus Cheyenneclarkara M. Clark, 2017
- Genus Chicalia D.L. Szlachetko & M. Kolanowska, 2022
- Genus Chileorchis D.L. Szlachetko, 2008 accepted as Chloraea J. Lindley, 1827
- Genus Chilocentrum Hort., 1976
- Genus Chiloglottis R. Brown, 1810
- Genus Chilopogon Schlechter, 1912
- Genus Chiloschista J. Lindley, 1832
- Genus Chilosimpliglottis J. Jeanes, 2002
- Genus Chiloterus D.L. Jones & M.A. Clements, 2004 accepted as Prasophyllum R. Brown, 1810
- Genus Chingsungara J.M.H. Shaw, 2022
- Genus Chingsunglinara J.M.H. Shaw, 2023
- Genus Chinheongara C.H. Tan ex J.M.H. Shaw, 2002
- Genus Chinkovsyara A. Easton, 2021
- Genus Chitonanthera Schlechter in K.M. Schumann & Lauterbach, 1905
- Genus Chitonochilus Schlechter in K.M. Schumann & Lauterbach, 1905
- Genus Chloidia J. Lindley, 1840
- Genus Chloraea J. Lindley, 1827
- Genus Chlorogavilea G. Verdura, 2015
- Genus Chlorosa Blume, 1825 accepted as Cryptostylis R. Brown, 1810
- Genus Chlorvilea E.A. Molinari-Novoa, 2016
- Genus Choeradoplectron J.C. Schauer, 1843 accepted as Habenaria Willdenow, 1805
- Genus Chondradenia Maximowicz ex Maekawa, 1971
- Genus Chondranthes Hort., 1998
- Genus Chondrobollea Rolfe, 1902
- Genus Chondropetalon Hort., 1908
- Genus Chondropetalum Hort., 1908 accepted as Chondropetalon Hort., 1908
- Genus Chondrorhyncha J. Lindley, 1846
- Genus Chondroscaphe (R.L. Dressler) K. Senghas & G. Gerlach in F.G. Brieger et al., 1993
- Genus Chouara C.C. Tsai, 2009
- Genus Chrisanda J.M.H. Shaw, 2003
- Genus Chrisanthera J.M.H. Shaw, 2005
- Genus Chrisnetia C.C. Kao, 2009
- Genus Chrisnopsis J.M.H. Shaw, 2004
- Genus Christendoritis J.M.H. Shaw, 2008
- Genus Christensonella D.L. Szlachetko, J. Mytnik-Ejsmont, M. Górniak & M. Śmiszek, 2006
- Genus Christensonia J.R. Haager, 1993
- Genus Christieara W.F. Christie & M. Wreford, 1969
- Genus Chromatotriccum M.A. Clements & D.L. Jones, 2002 accepted as Dendrobium O. Swartz, 1799
- Genus Chroniochilus J.J. Smith, 1918
- Genus Chrysobaphus Wallich, 1826 accepted as Anoectochilus Blume, 1825
- Genus Chrysocycnis Linden & H.G. Reichenbach, 1854 accepted as Mormolyca Fenzl, 1850
- Genus Chrysoglosella Hatusima, 1967
- Genus Chrysoglossum Blume, 1825
- Genus Chuanyenara Hort., 1976
- Genus Chuatianara Hort., 2000
- Genus Chusua S.A. Nevski in V.L. Komarov, 1935 accepted as Ponerorchis H.G. Reichenbach, 1852
- Genus Chyletia Hort., 1980
- Genus Chysis J. Lindley, 1837
- Genus Chytroglossa H.G. Reichenbach, 1863
- Genus Cionisaccus Breda, 1829
- Genus Ciripedium A.M. Zumaglini, 1829 accepted as Cypripedium Linnaeus, 1753
- Genus Cirranthus J.M.H. Shaw, 2021
- Genus Cirrhaea Lindley, 1832
- Genus Cirrhopea Hort., 1993
- Genus Cirrhopetalum J. Lindley, 1830 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Cirrhophyllum Hort., 1965
- Genus Cischostalix Hort., 1990
- Genus Cischweinfia Dressler & N.H. Williams, 1970
- Genus Cischweinidium J.M.H. Shaw, 2011
- Genus Cistella Blume, 1825 accepted as Geodorum G. Jackson in H.C. Andrews, 1811
- Genus Claderia J.D. Hooker, 1890
- Genus Cladobium J. Lindley, 1836 accepted as Scaphyglottis Poeppig & Endlicher, 1836
- Genus Cladobium Schlechter, 1920 accepted as Stenorrhynchos L.C. Richard ex K.P.J. Sprengel, 1826
- Genus Cladorhiza Rafinesque, 1828 accepted as Corallorhiza Gagnebin, 1755
- Genus Clarkeara Hort., 1999
- Genus Claudegayara J.M.H. Shaw, 2005
- Genus Claudegayara J.M.H. Shaw, 2004 accepted as Claudegayara J.M.H. Shaw, 2005
- Genus Claudehamiltonara J.M.H. Shaw, 2008
- Genus Claudiasauledaara J.M.H. Shaw, 2013
- Genus Clayara J.M.H. Shaw, 2008
- Genus Cleisanda J.M.H. Shaw, 2013
- Genus Cleisanthera M.Z. Huang, 2021
- Genus Cleiscocentrum J.M.H. Shaw, 2013
- Genus Cleisocalpa Hort., 1992
- Genus Cleisocentron Brühl, 1926
- Genus Cleisodes Hort., 1983
- Genus Cleisofinetia Hort., 1987
- Genus Cleisoglottis M. Chanyangam, 2017
- Genus Cleisomeria J. Lindley ex G. Don, 1855
- Genus Cleisonopsis Hort., 1977
- Genus Cleisopera Hort., 1991
- Genus Cleisoquetia Hort., 1983
- Genus Cleisostoma Blume, 1825
- Genus Cleisostomopsis G. Seidenfaden, 1992
- Genus Cleisostylanda J.M.H. Shaw, 2013
- Genus Cleisostylis Hort., 1992
- Genus Cleisotheria Hort., 1990
- Genus Cleisovanda J.M.H. Shaw, 2013
- Genus Cleistes L.C. Richard ex J. Lindley, 1840
- Genus Cleistesiopsis E.R. Pansarin & F. de Barros, 2009
- Genus Clematepistephium N. Hallé, 1977
- Genus Clomophyllum M. Chen & J.M.H. Shaw, 2003
- Genus Cloughara G.F. Carr & J.M.H. Shaw, 2002
- Genus Cloweandra L. Glicenstein, 2013
- Genus Clowenoches G.C. Kennedy, 1978
- Genus Clowesetenaea L. Glicenstein, 2013
- Genus Clowesetum G.C. Kennedy, 1978
- Genus Clowesia J. Lindley, 1843
- Genus Clowsellia B. Butts & C.T. Lefaive, 2015
- Genus Cnemidia J. Lindley, 1833 accepted as Tropidia J. Lindley, 1833
- Genus Coccineorchis Schlechter, 1920
- Genus Coccinoglottis L. Glicenstein, 2009
- Genus Cochella Hort., 1976
- Genus Cochleanthes Rafinesque, 1838
- Genus Cochleatorea Hort., 1965 accepted as Cochleatoria Hort., 1965
- Genus Cochleatoria Hort., 1965
- Genus Cochlecaste Hort., 1981
- Genus Cochlenia Hort., 1967
- Genus Cochleottia
- Genus Cochlepetalon Hort., 1980
- Genus Cochlepetalum Hort., 1980 accepted as Cochlepetalon Hort., 1980
- Genus Cochlesepalum R. Oba & J.M.H. Shaw, 2001
- Genus Cochlesteinella J.M.H. Shaw, 2010
- Genus Cochlezella J.M.H. Shaw, 2010
- Genus Cochlia Blume, 1825 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Cochlicidichilum J.M.H. Shaw, 2009
- Genus Cochlioda Lindley, 1853
- Genus Cochliodopsis J.M.H. Shaw, 2005
- Genus Cochliodopsis J.M.H. Shaw, 2004 accepted as Cochliodopsis J.M.H. Shaw, 2005
- Genus Cochlistele J.M.H. Shaw, 2005
- Genus Cochlistele J.M.H. Shaw, 2004 accepted as Cochlistele J.M.H. Shaw, 2005
- Genus Cochloncopsis J.M.H. Shaw, 2004 accepted as Cochloncopsis J.M.H. Shaw, 2005
- Genus Cochloncopsis J.M.H. Shaw, 2005
- Genus Cochlumnia J.M.H. Shaw, 2005
- Genus Cochlumnia J.M.H. Shaw, 2004 accepted as Cochlumnia J.M.H. Shaw, 2005
- Genus Cocleorchis D.L. Szlachetko, 1994 accepted as Cyclopogon K.B. Presl, 1827
- Genus Codonorchis J. Lindley, 1840
- Genus Codonosiphon Schlechter, 1912
- Genus Coelandria R.D. Fitzgerald, 1882 accepted as Dendrobium O. Swartz, 1799
- Genus Coeleione J.M.H. Shaw, 2003
- Genus Coelia Lindley, 1830
- Genus Coeliopsis H.G. Reichenbach, 1872
- Genus Coeloglossogymnadenia A. Camus in E.G. Camus & A. Camus, 1928 accepted as Gymnaglossum Rolfe, 1919
- Genus Coeloglossorchis Guétrot, 1927 accepted as Orchicoeloglossum P. Ascherson & P. Graebner, 1907
- Genus Coeloglossum C.J. Hartman, 1820 accepted as Dactylorhiza Necker ex Nevski, 1937
- Genus Coeloglossum Lindley, 1834 accepted as Peristylus Blume, 1825
- Genus Coelogyne J. Lindley, 1821?
- Genus Coeloneogyna J.M.H. Shaw, 2020
- Genus Coelonisea J.M.H. Shaw, 2022
- Genus Coeloplatanthera R. Ciferri & V. Giacomini, 1950
- Genus Coenadenium (V.S. Summerhayes) D.L. Szlachetko, 2003
- Genus Coenoemersa J.R. González Tamayo & L. Hernández Hernández, 2010
- Genus Cogniauxara L.A. Garay & H.R. Sweet, 1966
- Genus Cogniauxiocharis (Schlechter) Hoehne, 1944 accepted as Stenorrhynchos L.C. Richard ex K.P.J. Sprengel, 1826
- Genus Cohnia H.G. Reichenbach, 1852 accepted as Oncidium O. Swartz, 1800
- Genus Cohniella Pfitzer in Engler & Prantl, 1889 accepted as Oncidium O. Swartz, 1800
- Genus Cohnlophiaris W. Cetzal-Ix & R. Balam‐Narváez in Cetzal-Ix et al., 2012
- Genus Coilochilus Schlechter, 1906
- Genus Coilostylis Rafinesque, 1838 accepted as Epidendrum Linnaeus, 1763
- Genus Colaste Hort., 1988
- Genus Colax Lindley ex K.P.J. Sprengel, 1826
- Genus Colax J. Lindley, 1843 accepted as Pabstia Garay, 1973
- Genus Coleara J.M.H. Shaw, 2007
- Genus Coleottia Hort., 1994
- Genus Collabiopsis S.S. Ying, 1977 accepted as Collabium Blume, 1825
- Genus Collabium Blume, 1825
- Genus Collea J. Lindley, 1823 accepted as Pelexia Poiteau ex Lindley, 1826
- Genus Colmanara Hort., 1936
- Genus Colombiana M. Ospina, 1973 accepted as Pleurothallis R. Brown in W.T. Aiton, 1813
- Genus Commersonara J.M.H. Shaw, 2004 accepted as Commersonara J.M.H. Shaw, 2005
- Genus Commersonara J.M.H. Shaw, 2005
- Genus Comparettia Poeppig & Endlicher, 1836
- Genus Comparumnia J.M.H. Shaw, 2005
- Genus Comparumnia J.M.H. Shaw, 2004 accepted as Comparumnia J.M.H. Shaw, 2005
- Genus Compelenzia J.M.H. Shaw, 2004
- Genus Comperia K.H.E. Koch, 1849 accepted as Himantoglossum K.P.J. Sprengel, 1826
- Genus Conattleya J.M.H. Shaw, 2009
- Genus Conchidium W. Griffith, 1851 accepted as Eria J. Lindley, 1825
- Genus Conchochilus J.C. Hasskarl, 1842 accepted as Appendicula Blume, 1825
- Genus Conchograecum D.L. Szlachetko, E. Grochocka, N. Olędrzyńska & J. Mytnik, 2018 accepted as Angraecum Bory de St.-Vincent, 1804
- Genus Concocidium A. Romowicz & D.L. Szlachetko, 2006 accepted as Gomesa R. Brown in J. Sims, 1815
- Genus Condylago C.A. Luer, 1982
- Genus Conopsidium Wallroth, 1842
- Genus Conostalix (Kraenzlin) F.G. Brieger in F.G. Brieger et al., 1981 accepted as Dendrobium O. Swartz, 1799
- Genus Conphronitis Hort., 1983
- Genus Constanciaara J.M.H. Shaw, 2008
- Genus Constantia Barbosa Rodrigues, 1877
- Genus Cookara Hort., 1989
- Genus Cooktownia D.L. Jones, 1997
- Genus Coppensia Dumortier, 1835
- Genus Coppensitonia M.A. Campacci, 2011 accepted as Gomesa R. Brown in J. Sims, 1815
- Genus Coralliokyphos H. Fleischmann & K. Rechinger, 1910
- Genus Corallorhiza Gagnebin, 1755
- Genus Corallorrhiza Gagnebin, 1755 accepted as Corallorhiza Gagnebin, 1755
- Genus Corbettara J.M.H. Shaw, 2014
- Genus Cordanthera L.O. Williams, 1941 accepted as Stellilabium Schlechter, 1914
- Genus Cordiglottis J.J. Smith, 1922
- Genus Cordula Rafinesque, 1838 accepted as Paphiopedilum Pfitzer, 1886
- Genus Cordyla Blume, 1825 accepted as Nervilia Commerson ex Gaudichaud-Beaupré in Freycinet, 1829
- Genus Cordylestylis Falconer, 1841 accepted as Goodyera R. Brown in W.T. Aiton, 1813
- Genus Corningara H. Griffits & J.M.H. Shaw, 2007
- Genus Coronadoara R.F. Fuchs & J.M.H. Shaw, 2003
- Genus Correllara J.M.H. Shaw, 2011
- Genus Correorchis D.L. Szlachetko, 2008 accepted as Chloraea J. Lindley, 1827
- Genus Corunastylis R.D. Fitzgerald, 1888 accepted as Genoplesium R. Brown, 1810
- Genus Coryanthes W.J. Hooker, 1831
- Genus Corybas R.A. Salisbury, 1807
- Genus Corycium O. Swartz, 1800
- Genus Corydandra H.G.L. Reichenbach, 1841
- Genus Corygora B. Soderholm, 2023
- Genus Coryhopea Hort., 1985
- Genus Corymbis L.M.A.A. Du Petit-Thouars, 1822 accepted as Corymborkis Du Petit-Thouars, 1809
- Genus Corymborchis Du Petit-Thouars ex C.L. von Blume, 1859 accepted as Corymborkis Du Petit-Thouars, 1809
- Genus Corymborkis Du Petit-Thouars, 1809
- Genus Corysanthes R. Brown, 1810 accepted as Corybas R.A. Salisbury, 1807
- Genus Costaricaea Schlechter, 1923 accepted as Hexisea Lindley, 1834
- Genus Cottonia R. Wight, 1851
- Genus Cotylolabium L.A. Garay, 1982
- Genus Cowperara J.M.H. Shaw, 2007
- Genus Crangonorchis D.L. Jones & M.A. Clements, 2002 accepted as Pterostylis R. Brown, 1810
- Genus Cranichis O. Swartz, 1788
- Genus Cravenara H. Griffits & J.M.H. Shaw, 2007
- Genus Crawshayara Hort., 1978
- Genus Cremastra J. Lindley, 1833
- Genus Crepidium Blume, 1825 accepted as Malaxis Solander ex O. Swartz, 1788
- Genus Cribbia K. Senghas, 1985
- Genus Crinonia Blume, 1825 accepted as Pholidota Lindley ex W.J. Hooker, 1825
- Genus Criogenes R.A. Salisbury, 1814 accepted as Cypripedium Linnaeus, 1753
- Genus Criosanthes Rafinesque, 1819
- Genus Crocodeilanthe H.G. Reichenbach & Warscewicz, 1854 accepted as Pleurothallis R. Brown in W.T. Aiton, 1813
- Genus Crossangis Schlechter, 1918 accepted as Diaphananthe Schlechter, 1914
- Genus Crossoglossa R.L. Dressler & C.H. Dodson, 1993
- Genus Crossoliparis H.B. Margońska, 2009
- Genus Crybe J. Lindley, 1836 accepted as Bletia Ruiz & Pavón, 1794
- Genus Cryptanthemis Rupp, 1932 accepted as Rhizanthella R.S. Rogers, 1928
- Genus Cryptarrhena R. Brown, 1816
- Genus Cryptocentrum Bentham, 1880
- Genus Cryptochilus Wallich, 1824
- Genus Cryptoglottis Blume, 1825 accepted as Podochilus Blume, 1825
- Genus Cryptophoranthus Barbosa Rodrigues, 1881 accepted as Pleurothallis R. Brown in W.T. Aiton, 1813
- Genus Cryptopus Lindley, 1824
- Genus Cryptopylos Garay, 1972
- Genus Cryptosanus Scheidweiler in Otto & A.G. Dietrich, 1843 accepted as Leochilus Knowles & Westcott, 1838
- Genus Cryptostylis R. Brown, 1810
- Genus Crytopus Lindley, 1824 accepted as Cryptopus Lindley, 1824
- Genus Ctenorchis K.M. Schumann, 1901 accepted as Angraecum Bory de St.-Vincent, 1804
- Genus Cuculina Rafinesque, 1838 accepted as Catasetum L.C. Richard ex Kunth, 1822
- Genus Cuitlacidium J.M.H. Shaw, 2004 accepted as Cuitlacidium J.M.H. Shaw, 2005
- Genus Cuitlacidium J.M.H. Shaw, 2005
- Genus Cuitlauzina La Llave & Lexarza, 1825
- Genus Cuitliodaglossum J.M.H. Shaw, 2005
- Genus Cuitliodaglossum J.M.H. Shaw, 2004 accepted as Cuitliodaglossum J.M.H. Shaw, 2005
- Genus Cuitlumnia J.M.H. Shaw, 2005
- Genus Cuitlumnia J.M.H. Shaw, 2004 accepted as Cuitlumnia J.M.H. Shaw, 2005
- Genus Cutsis P. Balogh, E. Greenwood & Gonzales in P. Balogh & E. Greenwood, 1982 accepted as Dichromanthus L.A. Garay, 1982
- Genus Cyanaeorchis Barbosa Rodrigues, 1877
- Genus Cyanicula S.D. Hopper & A.P. Brown, 2000
- Genus Cyanorchis L.M.A.A. Du Petit-Thouars, 1822 accepted as Phaius Loureiro, 1790
- Genus Cyanorkis Du Petit-Thouars, 1809
- Genus Cyanthera N. Hoffman & A.P. Brown, 2004
- Genus Cyathoglottis Poeppig & Endlicher, 1836 accepted as Sobralia Ruiz & Pavon, 1794
- Genus Cybebus L.A. Garay, 1978
- Genus Cybelion K.P.J. Sprengel, 1826 accepted as Ionopsis Kunth in Humboldt, Bonpland & Kunth, 1816
- Genus Cycgalenodes A. Chen & J.M.H. Shaw, 2010
- Genus Cyclodes G.F. Carr & J.M.H. Shaw, 2002
- Genus Cyclopogon K.B. Presl, 1827
- Genus Cyclosia Klotzsch in Otto & A.G. Dietrich, 1838
- Genus Cycnandra Hort., 1997
- Genus Cycnoches J. Lindley, 1832
- Genus Cycnodes Hort., 1961
- Genus Cycnophyllum M. Chen & J.M.H. Shaw, 2003
- Genus Cycsellia Hort., 2000
- Genus Cydoniorchis K. Senghas, 1994
- Genus Cylindrochilus Thwaites, 1861
- Genus Cylindrolobus Blume, 1828 accepted as Eria J. Lindley, 1825
- Genus Cymaclosetum G.F. Carr & J.M.H. Shaw, 2002
- Genus Cymasetum Hort., 1994
- Genus Cymbidiella Rolfe, 1918
- Genus Cymbidilophia A. Chen, 2011
- Genus Cymbidiopsis H.J. Chowdhery, 2009 accepted as Cymbidium O. Swartz, 1799
- Genus Cymbidium O. Swartz, 1799
- Genus Cymbiglossum F. Halbinger, 1983 accepted as Lemboglossum F. Halbinger, 1984
- Genus Cymbilabia D.K. Liu & M.H. Li, 2020
- Genus Cymbiliorchis J.M.H. Shaw, 2008
- Genus Cymbipetalum J.M.H. Shaw, 2005
- Genus Cymbiphyllum Hort., 1967 accepted as Grammatocymbidium Hort., 1922
- Genus Cymbisellia M. Chen, 2010
- Genus Cymbisteria M.Z. Huang, 2021
- Genus Cymboglossum (J.J. Smith) F.G. Brieger in F.G. Brieger et al., 1981 accepted as Eria J. Lindley, 1825
- Genus Cymphiella Hort., 1988
- Genus Cynorchis Du Petit-Thouars, 1822 accepted as Cynorkis Du Petit-Thouars, 1809
- Genus Cynorkaria J.M.H. Shaw, 2009
- Genus Cynorkis Du Petit-Thouars, 1809
- Genus Cynosorchis Du Petit-Thouars, 1822 accepted as Cynorkis Du Petit-Thouars, 1809
- Genus Cyperochis Blume accepted as Cymbidium O. Swartz, 1799
- Genus Cyperocymbidium Hawkes, 1964
- Genus Cyperorchis Blume, 1849 accepted as Cymbidium O. Swartz, 1799
- Genus Cyphochilus Schlechter, 1912
- Genus Cypholoron C.H. Dodson & R.L. Dressler, 1972
- Genus Cypripedium Linnaeus, 1753
- Genus Cyrassostele J.M.H. Shaw, 2004 accepted as Cyrassostele J.M.H. Shaw, 2005
- Genus Cyrassostele J.M.H. Shaw, 2005
- Genus Cyrollaria J. Portilla, 2008
- Genus Cyrtellia Hort., 1985
- Genus Cyrtidiorchis S. Rauschert, 1982
- Genus Cyrtidium Schlechter, 1924 accepted as Cyrtidiorchis S. Rauschert, 1982
- Genus Cyrtionopsis J.M.H. Shaw, 2009
- Genus Cyrtobrassidium J.M.H. Shaw, 2011
- Genus Cyrtobrassonia J.M.H. Shaw, 2009
- Genus Cyrtocaucaea M. Portilla, 2013
- Genus Cyrtochiloides N.H. Williams & M.W. Chase, 2001
- Genus Cyrtochilum Kunth in Humboldt, Bonpland & Kunth, 1816
- Genus Cyrtocidistele J.M.H. Shaw, 2010
- Genus Cyrtocidium J.M.H. Shaw, 2003
- Genus Cyrtodenia J.M.H. Shaw, 2009
- Genus Cyrtodontella J.M.H. Shaw, 2008
- Genus Cyrtodontioda J.M.H. Shaw, 2008
- Genus Cyrtodontocidium J.M.H. Shaw, 2009
- Genus Cyrtodontostele J.M.H. Shaw, 2011
- Genus Cyrtoglossum J.M.H. Shaw, 2004 accepted as Cyrtoglossum J.M.H. Shaw, 2005
- Genus Cyrtoglossum J.M.H. Shaw, 2005
- Genus Cyrtoglottis Schlechter, 1920 accepted as Mormolyca Fenzl, 1850
- Genus Cyrtogomestele J.M.H. Shaw, 2012
- Genus Cyrtogramcymbidium A. Chen, 2008
- Genus Cyrtolauzina J.M.H. Shaw, 2004 accepted as Cyrtolauzina J.M.H. Shaw, 2005
- Genus Cyrtolauzina J.M.H. Shaw, 2005
- Genus Cyrtolioda J.M.H. Shaw, 2004 accepted as Cyrtolioda J.M.H. Shaw, 2005
- Genus Cyrtolioda J.M.H. Shaw, 2005
- Genus Cyrtomangophyllum J.M.H. Shaw, 2013
- Genus Cyrtonaea L. Glicenstein, 2012
- Genus Cyrtoncidopsis J.M.H. Shaw, 2010
- Genus Cyrtoncidumnia J.M.H. Shaw, 2009
- Genus Cyrtoniopsis J.M.H. Shaw, 2004 accepted as Cyrtoniopsis J.M.H. Shaw, 2005
- Genus Cyrtoniopsis J.M.H. Shaw, 2005
- Genus Cyrtopasia J.M.H. Shaw, 2009
- Genus Cyrtopera J. Lindley, 1833 accepted as Eulophia R. Brown, 1821
- Genus Cyrtopodium R. Brown in W.T. Aiton, 1813
- Genus Cyrtorchis Schlechter, 1914
- Genus Cyrtosetum A. Chen & J.M.H. Shaw, 2024
- Genus Cyrtosia Blume, 1825
- Genus Cyrtostele J.M.H. Shaw, 2009
- Genus Cyrtostylis R. Brown, 1810
- Genus Cyrtozia J.M.H. Shaw, 2009
- Genus Cyrtumnia J.M.H. Shaw, 2009
- Genus Cystochilum Barbosa Rodrigues, 1877 accepted as Cranichis O. Swartz, 1788
- Genus Cystopus Blume, 1858 accepted as Odontochilus Blume, 1858 (?)
- Genus Cystorchis Blume, 1858
- Genus Cytherea R.A. Salisbury, 1808 accepted as Calypso R.A. Salisbury, 1807
- Genus Cytheris J. Lindley, 1831 accepted as Calanthe R. Brown, 1821
- Genus Dacruzara C. Barnes, 2014
- Genus Dactylanthera P.F. Hunt & V.S. Summerhayes in J.C. Willis, 1966
- Genus Dactyleucorchis Soó, 1966
- Genus Dactylitella P.F. Hunt & Summerhayes, 1965
- Genus Dactylocamptis P.F. Hunt & Summerhayes, 1965
- Genus Dactyloceras L.A. Garay & H.R. Sweet, 1969
- Genus Dactylodenia L.A. Garay & H.R. Sweet, 1966
- Genus Dactyloglossum P.F. Hunt & Summerhayes, 1965
- Genus Dactylogymnadenia Soó, 1966
- Genus Dactylorchis (Klinge) Vermeulen, 1947 accepted as Dactylorhiza Necker ex Nevski, 1937
- Genus Dactylorhiza Necker ex Nevski, 1937
- Genus Dactylorhynchus Schlechter, 1912
- Genus Dactylostalix H.G. Reichenbach, 1878
- Genus Dactylostylis Scheidweiler in Otto & A.G. Dietrich, 1839 accepted as Zygostates Lindley, 1837
- Genus Dallemagneara J.M.H. Shaw, 2007
- Genus Danhatchia L.A. Garay & E.A. Christenson, 1995
- Genus Danxiaorchis J.W. Zhai, F.W. Xing & Z.J. Liu, 2013
- Genus Darwinara Hort., 1980
- Genus Darwiniella L.A. Braas & E. Lückel, 1982 accepted as Stellilabium Schlechter, 1914
- Genus Darwiniera L.A. Braas & E. Lückel, 1982 accepted as Stellilabium Schlechter, 1914
- Genus Dasyglossum W. Königer & H. Schildhauer, 1994
- Genus Davejonesia M.A. Clements, 2002 accepted as Dendrobium O. Swartz, 1799
- Genus Davidsonara J.M.H. Shaw, 2005
- Genus Debarriara J.M.H. Shaw, 2011
- Genus Debruyneara Hort., 1972
- Genus Decaisnea A.T. Brongniart in Duperrey, 1834 accepted as Prescottia J. Lindley in W.J. Hooker, 1824
- Genus Decaisnea J. Lindley, 1832 accepted as Tropidia J. Lindley, 1833
- Genus Deceptor G. Seidenfaden, 1992
- Genus Degarmoara Hort., 1968
- Genus Degranvillea R.O. Determann, 1985
- Genus Deiregyne Schlechter, 1920
- Genus Deiregynopsis S. Rauschert, 1982 accepted as Aulosepalum L.A. Garay, 1982
- Genus Deiselara Hort., 1989
- Genus Dekensara Hort., 1955
- Genus Delouvrexara J.M.H. Shaw, 2010
- Genus Dendrobates M.A. Clements & D.L. Jones, 2002 accepted as Dendrobium O. Swartz, 1799
- Genus Dendrobianthe J. Mytnik Ejsmont, 2008
- Genus Dendrobium O. Swartz, 1799
- Genus Dendrocatanthe J.M.H. Shaw, 2011
- Genus Dendrocattleya R.E. Schultes & A.S. Pease, 1963
- Genus Dendrochilum Blume, 1825 accepted as Coelogyne J. Lindley, 1821?
- Genus Dendrocolla Blume, 1825
- Genus Dendrocoryne (Lindley) F.G. Brieger in F.G. Brieger et al., 1981 accepted as Dendrobium O. Swartz, 1799
- Genus Dendrogeria Hort., 1988
- Genus Dendrolirium Blume, 1825 accepted as Eria J. Lindley, 1825
- Genus Dendrophylax H.G. Reichenbach in C. Müller, 1864
- Genus Dendrorchis L.M.A. du P. Thouars ex C.E.O. Kuntze, 1891
- Genus Dendrorkis Du Petit-Thouars, 1809 accepted as Aerides Loureiro, 1790
- Genus Denisara J.M.H. Shaw, 2009
- Genus Denslovia Rydberg, 1931 accepted as Habenaria Willdenow, 1805
- Genus Deppia Rafinesque, 1837 accepted as Lycaste Lindley, 1843
- Genus Deprinsara A. De Prins, 2007
- Genus Deroemera H.G. Reichenbach, 1852 accepted as Holothrix L.C. Richard ex J. Lindley, 1835
- Genus Derosaara Hort., 1996
- Genus Desmetara J.M.H. Shaw, 2010
- Genus Desmotrichum Blume, 1825 accepted as Flickingeria A.D. Hawkes, 1961
- Genus Devereuxara Hort., 1970
- Genus Devogelia A. Schuiteman, 2004
- Genus Devriesara J.M.H. Shaw, 2009
- Genus Dewolfara L.A. Garay & H.R. Sweet, 1969
- Genus Diabroughtonia Hort., 1956
- Genus Diacattleya Hort., 1908
- Genus Diacrium (Lindley) Bentham, 1881 accepted as Caularthron Rafinesque, 1837
- Genus Diacrocattleya Hort., 1908
- Genus Diacro-Cattleya Hort., 1908 accepted as Diacrocattleya Hort., 1908
- Genus Diadeniopsis D.L. Szlachetko, 2006 accepted as Systeloglossum Schlechter, 1923
- Genus Diadenium Poeppig & Endlicher, 1836
- Genus Diakeria Hort., 1992
- Genus Dialaelia Hortus, 1905
- Genus Dialaeliocattleya Hort., 1915
- Genus Dialaeliopsis Hort., 1966
- Genus Dialissa J. Lindley, 1845 accepted as Stelis O. Swartz, 1800
- Genus Diaphanangis Hort., 1986
- Genus Diaphananthe Schlechter, 1914
- Genus Diaschomburgkia W.W.G. Moir, 1957
- Genus Diceratostele Summerhayes, 1938
- Genus Dicerostylis Blume, 1859 accepted as Hylophila J. Lindley, 1833
- Genus Dichaea J. Lindley, 1833
- Genus Dichaeopsis Pfitzer, 1887 accepted as Dichaea J. Lindley, 1833
- Genus Dichopus Blume, 1856 accepted as Dendrobium O. Swartz, 1799
- Genus Dichromanthus L.A. Garay, 1982
- Genus Dichromarrhynchos L. Glicenstein, 2009
- Genus Dickasonia L.O. Williams, 1941 accepted as Coelogyne J. Lindley, 1821?
- Genus Dicksonhowara W.L. How, J. Elliot & J.M.H. Shaw, 2013
- Genus Dicranotaenia Finet, 1907 accepted as Microcoelia J. Lindley, 1830
- Genus Dicrophyla Rafinesque, 1838
- Genus Dicrypta J. Lindley, 1830 accepted as Heterotaxis J. Lindley, 1826
- Genus Dictyophyllaria L.A. Garay, 1986
- Genus Didactyle J. Lindley, 1852 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Didiciea G. King & D. Prain in G. King & R. Pantling, 1896
- Genus Didimoplexiella L.A. Garay, 1954 accepted as Didymoplexiella L.A. Garay, 1954
- Genus Didothion Rafinesque, 1838 accepted as Epidendrum Linnaeus, 1763
- Genus Didymoplexiella L.A. Garay, 1954
- Genus Didymoplexiopsis G. Seidenfaden, 1997
- Genus Didymoplexis W. Griffith, 1843
- Genus Dienia J. Lindley, 1824 accepted as Malaxis Solander ex O. Swartz, 1788
- Genus Diglyphis C.L. von Blume, 1828 accepted as Diglyphosa Blume, 1825
- Genus Diglyphosa Blume, 1825
- Genus Dignathe J. Lindley, 1849
- Genus Digomphotis Rafinesque, 1837 accepted as Habenaria Willdenow, 1805
- Genus Dikylikostigma Kraenzlin, 1919 accepted as Discyphus R. Schlechter, 1919
- Genus Dillonara Hort., 1966
- Genus Dilochia J. Lindley, 1830
- Genus Dilochiopsis (J.D. Hooker) F.G. Brieger in F.G. Brieger et al., 1981 accepted as Eria J. Lindley, 1825
- Genus Dilochopsis (J.D. Hooker) F.G. Brieger in F.G. Brieger et al., 1981 accepted as Dilochiopsis (J.D. Hooker) F.G. Brieger in F.G. Brieger et al., 1981
- Genus Dilomilis Rafinesque, 1838
- Genus Dimerandra Schlechter, 1922
- Genus Dimorphachnis J.M.H. Shaw, 2014
- Genus Dimorphanda J.M.H. Shaw, 2014
- Genus Dimorphorchis Rolfe, 1919
- Genus Dineclia J.M.H. Shaw, 2014
- Genus Dinema J. Lindley, 1831 accepted as Encyclia W.J. Hooker, 1828
- Genus Dinklageella Mansfeld, 1934
- Genus Diodonopsis A.M. Pridgeon & M.W. Chase, 2001
- Genus Diothonea J. Lindley, 1834 accepted as Epidendrum Linnaeus, 1763
- Genus Diovallia J.M.H. Shaw, 2007
- Genus Dipera C.P.J. Sprengel, 1826 accepted as Disperis O. Swartz, 1800
- Genus Diphryllum Rafinesque, 1808 accepted as Listera R. Brown in W.T. Aiton, 1813
- Genus Diphyes Blume, 1825 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Diphylax J.D. Hooker, 1889
- Genus Diplacorchis Schlechter, 1921
- Genus Diplandrorchis S.C. Chen, 1979 accepted as Neottia Guettard, 1754
- Genus Diplanthera C.S. Rafinesque, 1833 accepted as Platanthera L.C. Richard, 1817
- Genus Diplecthrum Persoon, 1807 accepted as Satyrium O. Swartz, 1800
- Genus Diplectraden Rafinesque, 1837 accepted as Habenaria Willdenow, 1805
- Genus Diplectrum Persoon accepted as Diplecthrum Persoon, 1807
- Genus Diplocaulobium (H.G. Reichenbach) F. Kraenzlin in Engler, 1910
- Genus Diplocentrum J. Lindley, 1832
- Genus Diplochilos J. Lindley, 1832
- Genus Diplochilus J. Lindley, 1832 accepted as Diplomeris D. Don, 1825
- Genus Diploconchium J.C. Schauer, 1843 accepted as Agrostophyllum Blume, 1825
- Genus Diplodium O. Swartz, 1810 accepted as Pterostylis R. Brown, 1810
- Genus Diplogastra Welwitsch ex H.G. Reichenbach, 1865
- Genus Diplolabellum F. Maekawa, 1935
- Genus Diplomeris D. Don, 1825
- Genus Diplonopsis Hort., 1977
- Genus Diplopanda J.M.H. Shaw, 2011
- Genus Diploprora J.D. Hooker, 1890
- Genus Dipodium R. Brown, 1810
- Genus Dipteranthus Barbosa Rodrigues, 1882
- Genus Dipterostele Schlechter, 1921 accepted as Stellilabium Schlechter, 1914
- Genus Disa P.J. Bergius, 1767
- Genus Discyphus R. Schlechter, 1919
- Genus Diseris Wight, 1719 accepted as Disperis O. Swartz, 1800
- Genus Disperis O. Swartz, 1800
- Genus Dissorhynchium J.C. Schauer, 1843 accepted as Habenaria Willdenow, 1805
- Genus Distichis L.M.A. du P. Thouars ex J. Lindley, 1847 accepted as Liparis L.C. Richard, 1817
- Genus Distichorchis M.A. Clements & D.L. Jones, 2002 accepted as Dendrobium O. Swartz, 1799
- Genus Distomaea Spenner, 1825 accepted as Listera R. Brown in W.T. Aiton, 1813
- Genus Distylodon V.S. Summerhayes, 1966
- Genus Diteilis Rafinesque, 1833 (?) accepted as Liparis L.C. Richard, 1817
- Genus Dithrix (J.D. Hooker) Schlechter, 1926 accepted as Habenaria Willdenow, 1805
- Genus Dithyridanthus L.A. Garay, 1982 accepted as Deiregyne Schlechter, 1920
- Genus Ditulima Rafinesque, 1838 accepted as Dendrobium O. Swartz, 1799
- Genus Diuris J.E. Smith, 1798
- Genus Dixuanara W.R. How, 2005
- Genus Docjonesia J.M.H. Shaw, 2003
- Genus Dockrillia F.G. Brieger in F.G. Brieger et al., 1981 accepted as Dendrobium O. Swartz, 1799
- Genus Dodara J.M.H. Shaw, 2009
- Genus Dodsonia J.D. Ackerman, 1979
- Genus Doinara J.M.H. Shaw, 2007
- Genus Dolichocentrum (Schlechter) F.G. Brieger in F.G. Brieger et al., 1981 accepted as Dendrobium O. Swartz, 1799
- Genus Domindendrum W.W.G. Moir, 1957
- Genus Domindesmia Hort., 1964
- Genus Domingleya J.M.H. Shaw, 2009
- Genus Domingoa Schlechter in Urban, 1913
- Genus Dominleychile J.M.H. Shaw, 2013
- Genus Domintonia W.W.G. Moir, 1957
- Genus Dominyara Hort., 1980
- Genus Domliopsis Hort., 1965
- Genus Donacopsis Gagnepain, 1932
- Genus Donaestelaara J.M.H. Shaw, 2008
- Genus Doncollinara Hort., 1982
- Genus Donsutingara J.M.H. Shaw, 2013
- Genus Dorandopsis Hort., 1978
- Genus Doredirea J.M.H. Shaw, 2003
- Genus Doreenhuntara Hort., 1999
- Genus Doricentrum Hort., 1969
- Genus Doriella Hort., 1966
- Genus Doriellaopsis Hort., 1968
- Genus Dorifinetia Hort., 1975
- Genus Doriglossum Hort., 1979
- Genus Dorisia Hort., 1993
- Genus Doristylis Hort., 1978
- Genus Doritaenopsis Guillaumin & Lami, 1935 accepted as Phalaenopsis Blume, 1825
- Genus Doritis J. Lindley, 1833 accepted as Phalaenopsis Blume, 1825
- Genus Doritopsis Krackow, 1950
- Genus Dormanara J.M.H. Shaw, 2009
- Genus Dorthera Hort., 1976
- Genus Dorycheile H.G.L. Reichenbach, 1841 accepted as Cephalanthera L.C. Richard, 1817
- Genus Dossinia C. Morren, 1848
- Genus Dossinimaria R.A. Rolfe, 1887 accepted as Dossisia L.A. Garay & H.R. Sweet, 1966
- Genus Dossinochilus L. Glicenstein & J.M.H. Shaw, 2004
- Genus Dossinyera L. Glicenstein & J.M.H. Shaw, 2003
- Genus Dossisia L.A. Garay & H.R. Sweet, 1966
- Genus Dothilis Rafinesque, 1837 accepted as Spiranthes L.C. Richard, 1817
- Genus Dothilophis Rafinesque, 1838 accepted as Epidendrum Linnaeus, 1763
- Genus Downsara Hort., 1975
- Genus Doxosma Rafinesque, 1838 accepted as Epidendrum Linnaeus, 1763
- Genus Dracomonticola H.P. Linder & H. Kurzweil, 1995
- Genus Draconanthes (C.A. Luer) C.A. Luer, 1996
- Genus Dracula C.A. Luer, 1978
- Genus Dracuvallia C.A. Luer, 1978
- Genus Drakaea J. Lindley, 1840
- Genus Drakodenia N. Hoffman & A.P. Brown, 1992
- Genus Dresslerara Hort., 1983
- Genus Dresslerella C.A. Luer, 1976
- Genus Dressleria C.H. Dodson, 1975
- Genus Dressleriella F.G. Brieger in F.G. Brieger et al., 1977 accepted as Jacquiniella Schlechter, 1920
- Genus Drewettara J.M.H. Shaw, 2007
- Genus Dryadella C.A. Luer, 1978
- Genus Dryadorchis Schlechter, 1913
- Genus Drymoanthus W.H. Nicholls, 1943
- Genus Drymoda J. Lindley, 1838
- Genus Dryopeia L.M.A. du P. Thouars, 1822 accepted as Disperis O. Swartz, 1800
- Genus Dryopria Du Petit-Thouars, 1822
- Genus Dryorchis Thouars accepted as Disperis O. Swartz, 1800
- Genus Dryorkis Du Petit-Thouars, 1809 accepted as Disperis O. Swartz, 1800
- Genus Duboisia H. Karsten, 1847 accepted as Myoxanthus Poeppig & Endlicher, 1836
- Genus Duboisreymondia H. Karsten, 1848 accepted as Dubois-Reymondia H. Karsten, 1848
- Genus Dubois-Reymondia H. Karsten, 1848 accepted as Myoxanthus Poeppig & Endlicher, 1836
- Genus Duckeella Porto & Brade, 1940
- Genus Duckittara W. Duckitt, 2008
- Genus Duggerara Hort., 1982
- Genus Dungsara J.M.H. Shaw, 2009
- Genus Dunkelbergerara J. Kaeding & J.M.H. Shaw, 2020
- Genus Dunnara Hort., 1979
- Genus Dunningara Hort., 1980
- Genus Dunstervillea Garay in Dunsterville & Garay, 1972
- Genus Dunstervilleara J.M.H. Shaw, 2009
- Genus Dupontara J.M.H. Shaw, 2008
- Genus Durabaculum M.A. Clements & D.L. Jones, 2002 accepted as Dendrobium O. Swartz, 1799
- Genus Durantara C. Barnes, 2014
- Genus Durutyara Hort., 1976
- Genus Duvalara J.M.H. Shaw, 2007
- Genus Dyakia E.A. Christenson, 1986
- Genus Earina J. Lindley, 1834
- Genus Eastonara Hort., 1975
- Genus Eburophyton Heller, 1904 accepted as Cephalanthera L.C. Richard, 1817
- Genus Echinoglossum H.G.L. Reichenbach, 1841 accepted as Cleisostoma Blume, 1825
- Genus Echinosepala A.M. Pridgeon & M.W. Chase, 2002
- Genus Echioglossum Blume, 1825
- Genus Eckartia H.G.L. Reichenbach, 1841 accepted as Peristeria W.J. Hooker, 1831
- Genus Eclecticus P. O'Byrne, 2009
- Genus Ecuadorella C.H. Dodson & G.A. Romero-González, 2010 accepted as Otoglossum (Schlechter) Garay & Dunsterville in Dunsterville & Garay, 1976
- Genus Ecuadoria C.H. Dodson & R.L. Dressler, 1994 accepted as Microthelys L.A. Garay, 1982
- Genus Edara J.M.H. Shaw, 2008
- Genus Edeara Hort., 1976
- Genus Effusiella C.A. Luer, 2007 accepted as Stelis O. Swartz, 1800
- Genus Eggelingia Summerhayes, 1951
- Genus Eichlerangraecum D.L. Szlachetko, J. Mytnik-Ejsmont & E. Grochocka, 2013 accepted as Angraecum Bory de St.-Vincent, 1804
- Genus Eksanara W. Tjiasmanto & J.M.H. Shaw, 2022
- Genus Elasmatium Dulac, 1867 accepted as Goodyera R. Brown in W.T. Aiton, 1813
- Genus Elearethusa Hort., 1994
- Genus Elecalthusa Hort., 1996
- Genus Eleorchis Maekawa, 1935
- Genus Elepogon Hort., 1993
- Genus Eleutheroglossum (F.R.R. Schlechter) M.A. Clements & D.L. Jones, 2002 accepted as Dendrobium O. Swartz, 1799
- Genus Eliara Hort., 1997
- Genus Elleanthus K.B. Presl, 1827
- Genus Eloyella P. Ortiz Valdivieso, 1979 accepted as Dunstervillea Garay in Dunsterville & Garay, 1972
- Genus Eltrolexia L. Glicenstein, 2016
- Genus Eltroplectris Rafinesque, 1837
- Genus Eltropterolexia L. Glicenstein, 2019
- Genus Elwesara H. Griffits & J.M.H. Shaw, 2007
- Genus Elythodia Hort., 2000
- Genus Elythranthera (Endlicher) A.S. George, 1963
- Genus Embreea C.H. Dodson, 1980
- Genus Emigara D. Emig & J.M.H. Shaw, 2015
- Genus Emilythwaitesara J.M.H. Shaw, 2009
- Genus Empusa J. Lindley, 1824 accepted as Liparis L.C. Richard, 1817
- Genus Empusaria H.G.L. Reichenbach, 1829 accepted as Liparis L.C. Richard, 1817
- Genus Enanthleya J.M.H. Shaw, 2007
- Genus Encabarcenia F. Archila & D.L. Szlachetko, 2014
- Genus Encalaelia F. Archila & D.L. Szlachetko, 2014
- Genus Encheiridion Summerhayes, 1943 accepted as Microcoelia J. Lindley, 1830
- Genus Enchelia Z.-H. Feng & J.M.H. Shaw, 2022
- Genus Encyarthrolia J.M.H. Shaw, 2008
- Genus Encyclia W.J. Hooker, 1828
- Genus Encyleyola
- Genus Encytonavola J.M.H. Shaw, 2008
- Genus Encyvola J.M.H. Shaw, 2004
- Genus Endeisa Rafinesque, 1837 accepted as Dendrobium O. Swartz, 1799
- Genus Endlicherara J.M.H. Shaw, 2004 accepted as Endlicherara J.M.H. Shaw, 2005
- Genus Endlicherara J.M.H. Shaw, 2005
- Genus Endresiella Schlechter, 1921 accepted as Trevoria F.C. Lehmann, 1897
- Genus Engkhiamara Hort., 2001
- Genus Engsoonara J.M.H. Shaw, 2003
- Genus Enothrea Rafinesque, 1838 accepted as Octomeria R. Brown in W.T. Aiton, 1813
- Genus Entaticus S.F. Gray, 1821 accepted as Habenaria Willdenow, 1805
- Genus Enthevola J.M.H. Shaw, 2024
- Genus Entomophobia E.F. de Vogel, 1984 accepted as Coelogyne J. Lindley, 1821?
- Genus Eoorchis J. Mehl, 1984 †
- Genus Eparmatostigma Garay, 1972
- Genus Ephemerantha P.F. Hunt & V.S. Summerhayes, 1961 accepted as Flickingeria A.D. Hawkes, 1961
- Genus Ephippianthus H.G. Reichenbach, 1868
- Genus Ephippium Blume, 1825 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Epibarkiella Hort., 1983
- Genus Epibator C.A. Luer, 2004
- Genus Epiblastus Schlechter in K.M. Schumann & Lauterbach, 1905
- Genus Epiblema R. Brown, 1810
- Genus Epibrassavola Hort., 1926 accepted as Brassoepidendrum Hort., 1906
- Genus Epibrassonitis Hort., 1977
- Genus Epibroughtonia W.W.G. Moir, 1957
- Genus Epicatanthe J.M.H. Shaw, 2007
- Genus Epicatarthron J.M.H. Shaw, 2008
- Genus Epicatcyclia J.M.H. Shaw, 2008
- Genus Epicatechea J.M.H. Shaw, 2007
- Genus Epicatonia Hort., 1978
- Genus Epicattlaelia Hort. in F.A.E. Price, 1933
- Genus Epicattleya Hort., 1889
- Genus Epicaulaelia J.M.H. Shaw, 2012
- Genus Epichile J.M.H. Shaw, 2013
- Genus Epicladium (J. Lindley) J.K. Small, 1913 accepted as Epidendrum Linnaeus, 1763
- Genus Epicranthes Blume, 1825 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Epicrianthes C.L. von Blume, 1828 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Epicrianthus Blume accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Epicyclia J.M.H. Shaw, 2004
- Genus Epidanthus L.O. Williams, 1940 accepted as Epidendrum Linnaeus, 1763
- Genus Epidella Hort., 1974
- Genus Epidendropsis Garay & Dunsterville in Dunsterville & Garay, 1976 accepted as Epidendrum Linnaeus, 1763
- Genus Epidendrum Linnaeus, 1753 accepted as Brassavola R. Brown in W.T. Aiton, 1813
- Genus Epidendrum Linnaeus, 1763
- Genus Epidiacrium Hort., 1908
- Genus Epidomingoleya L. Glicenstein, 2011
- Genus Epidominkeria J.M.H. Shaw, 2008
- Genus Epidorkis Du Petit-Thouars, 1809
- Genus Epierstedella J.M.H. Shaw, 2004
- Genus Epigeneium Gagnepain, 1932
- Genus Epiglottis Hort., 1986
- Genus Epigoa Hort., 1957
- Genus Epilaelia Hort., 1894
- Genus Epilaeliocattleya Hort., 1960
- Genus Epilaeliopsis Hort., 1959
- Genus Epilaelopsis Hort., 1959
- Genus Epileptovola Hort., 1994
- Genus Epiliopsis W.W.G. Moir, 1957
- Genus Epilopsis C.L. Withner, 1971 accepted as Psytonia J.M.H. Shaw, 2004
- Genus Epilopsis Hort., 1957
- Genus Epilyna Schlechter, 1918
- Genus Epimicra Hort., 1994
- Genus Epinidema J.M.H. Shaw, 2004
- Genus Epiopsis Hort., 1991
- Genus Epipactis Zinn, 1757
- Genus Epipactis Séguier, 1754
- Genus Epipactis Persoon, 1807
- Genus Epiphanes Blume, 1825
- Genus Epiphora Lindley, 1837 accepted as Polystachya W.J. Hooker, 1824
- Genus Epiphorella J. Mytnik-Ejsmont & D.L. Szlachetko, 2008 accepted as Polystachya W.J. Hooker, 1824
- Genus Epiphronitella A.D. Hawkes, 1961
- Genus Epiphronitis Hort., 1890
- Genus Epipogium Gmelin ex Borkhausen, 1792
- Genus Epipogon C.F. von Ledebour, 1852 accepted as Epipogium Gmelin ex Borkhausen, 1792
- Genus Epirhynanthe J.M.H. Shaw, 2008
- Genus Epistephium Kunth, 1822
- Genus Epistoma Hort., 1985
- Genus Epithechavola J.M.H. Shaw, 2008
- Genus Epithechea J.M.H. Shaw, 2005
- Genus Epithechea J.M.H. Shaw, 2004 accepted as Epithechea J.M.H. Shaw, 2005
- Genus Epithecia Knowles & Westcott, 1839
- Genus Epitonanthe H. Griffits & J.M.H. Shaw, 2007
- Genus Epitonia Hort., 1960
- Genus Epivola R.A. Rolfe, 1908
- Genus Erasaecum J.M.H. Shaw, 2022
- Genus Erasanthe P.J. Cribb, J. Hermans & D.L. Roberts, 2007
- Genus Eremorchis D.L. Jones & M.A. Clements, 2002 accepted as Pterostylis R. Brown, 1810
- Genus Eria J. Lindley, 1825
- Genus Eriaxis H.G. Reichenbach, 1876
- Genus Ericara J.M.H. Shaw, 2013
- Genus Ericholttumara J.M.H. Shaw, 2013
- Genus Ericksonella S.D. Hopper & A.P. Bown, 2004
- Genus Erikstephenstormara P.A. Storm & J.M.H. Shaw, 2015
- Genus Erinara J.M.H. Shaw, 2013
- Genus Eriochilum F.M.A.F. von Ritgen, 1831 accepted as Eriochilus R. Brown, 1810
- Genus Eriochilus R. Brown, 1810
- Genus Eriochylus E.G. von Steudel, 1840 accepted as Eriochilus R. Brown, 1810
- Genus Eriodes Rolfe, 1915
- Genus Erioidea W. Griffith, 1848
- Genus Eriopexis (Schlechter) F.G. Brieger in F.G. Brieger et al., 1981
- Genus Eriopsis J. Lindley, 1847
- Genus Erioxantha Rafinesque, 1832 accepted as Eria J. Lindley, 1825
- Genus Ernestara Hort., 1968
- Genus Erporchis Du Petit-Thouars, 1822 accepted as Platylepis A. Richard, 1828
- Genus Erporkis Du Petit-Thouars, 1809 accepted as Platylepis A. Richard, 1828
- Genus Erycina Lindley, 1853
- Genus Erydium Hort., 1986
- Genus Erymesa J.M.H. Shaw, 2011
- Genus Erythrodes Blume, 1825
- Genus Erythrorchis Blume, 1837
- Genus Eryumnia C. Chang, 2012
- Genus Esmenanthera L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Esmeralda H.G. Reichenbach, 1862
- Genus Esmeranda M. Vacherot, 1954
- Genus Esmeropsis J.M.H. Shaw, 2003
- Genus Esmerstylis J.M.H. Shaw, 2003
- Genus Esperonara R.P. Sauleda, 2011
- Genus Espinhassoa G.A. Salazar & J.A.N. Batista, 2019
- Genus Estelaara Hort., 1996
- Genus Estelara Hort., 1996 accepted as Estelaara Hort., 1996
- Genus Etaeria Blume, 1825 accepted as Hetaeria Blume, 1825
- Genus Euanthe Schlechter, 1914 accepted as Vanda W. Jones ex R. Brown, 1820
- Genus Euarachnides L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Euarthron J.M.H. Shaw, 2013
- Genus Eucatanthe J.M.H. Shaw, 2013
- Genus Eucatlaelia J.M.H. Shaw, 2013
- Genus Eucatophila J.M.H. Shaw, 2013
- Genus Eucattlevola J.M.H. Shaw, 2013
- Genus Eucattonia J.M.H. Shaw, 2013
- Genus Eucentrum L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Euchiclia J.M.H. Shaw, 2013
- Genus Euchilaelia J.M.H. Shaw, 2013
- Genus Euclades Hort., 1996
- Genus Eucnemia H.G.L. Reichenbach, 1841 accepted as Govenia J. Lindley, 1832
- Genus Eucnemis J. Lindley, 1833 accepted as Govenia J. Lindley, 1832
- Genus Eucosia Blume, 1825
- Genus Eucycattleya J.M.H. Shaw, 2013
- Genus Eucyclechea J.M.H. Shaw, 2013
- Genus Eudendravola J.M.H. Shaw, 2013
- Genus Eudisanthema Necker ex Post & O. Kuntze, 1903 accepted as Brassavola R. Brown in W.T. Aiton, 1813
- Genus Eulaelianthe J.M.H. Shaw, 2013
- Genus Euleya J.M.H. Shaw, 2013
- Genus Euleyarthron J.M.H. Shaw, 2013
- Genus Eulobidium P. Rakthai, 2013
- Genus Eulocymbidiella Hort., 1981
- Genus Eulomangis J.M.H. Shaw, 2010
- Genus Eulophia R. Brown, 1821
- Genus Eulophidium Pfitzer, 1887 accepted as Oeceoclades Lindley, 1832
- Genus Eulophiella Rolfe, 1892
- Genus Eulophiopsis Pfitzer, 1887 accepted as Graphorkis L.M.A.A. Du Petit-Thouars, 1809
- Genus Eulophus R. Brown, 1821 accepted as Eulophia R. Brown, 1821
- Genus Eulopodium J.M.H. Shaw, 2018
- Genus Eumingoa J.M.H. Shaw, 2013
- Genus Eunannos P. Campos Porto & A.C. Brade, 1935
- Genus Euothonaea H.G. Reichenbach, 1852 accepted as Hexisea Lindley, 1834
- Genus Eupapilanda L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Euphlebium (Kraenzlin) F.G. Brieger in F.G. Brieger et al., 1981 accepted as Dendrobium O. Swartz, 1799
- Genus Euporphyranda L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Euproboscis W. Griffith, 1844 accepted as Thelasis Blume, 1825
- Genus Eurachnis B. Choon, 1960 accepted as Aranda Hort., 1937
- Genus Eurhyncattleya J.M.H. Shaw, 2013
- Genus Euryangis Hort., 1980
- Genus Eurycaulis M.A. Clements & D.L. Jones, 2002 accepted as Dendrobium O. Swartz, 1799
- Genus Eurycentrum Schlechter in K.M. Schumann & Lauterbach, 1905
- Genus Eurychone Schlechter, 1918
- Genus Eurygraecum Hort., 1987
- Genus Eurynopsis Hort., 1977
- Genus Eurystyles Wawra, 1863
- Genus Euthechedendrum J.M.H. Shaw, 2013
- Genus Eutonia J.M.H. Shaw, 2013
- Genus Euvola J.M.H. Shaw, 2013
- Genus Evakara J.M.H. Shaw, 2013
- Genus Evelyna Poeppig & Endlicher, 1836 accepted as Elleanthus K.B. Presl, 1827
- Genus Evota (Lindley) Rolfe in Thiselton-Dyer, 1913 accepted as Ceratandra Lindley in F.A. Bauer & Lindley, 1838
- Genus Evotella H. Kurzweil & H.P. Linder, 1991
- Genus Evrardia Gagnepain, 1932 accepted as Odontochilus Blume, 1858 (?)
- Genus Evrardiana L.V. Averyanov, 1988 accepted as Odontochilus Blume, 1858 (?)
- Genus Evrardianthe S. Rauschert, 1983 accepted as Odontochilus Blume, 1858 (?)
- Genus Exalaria L.A. Garay & G.A. Romero, 1999
- Genus Exeria Rafinesque, 1838 accepted as Eria J. Lindley, 1825
- Genus Exochanthus M.A. Clements & D.L. Jones, 2002 accepted as Dendrobium O. Swartz, 1799
- Genus Exophya Rafinesque, 1837 accepted as Epidendrum Linnaeus, 1763
- Genus Eydisanthema Necker ex Rafinesque, 1838
- Genus Fergusonara Hort., 1976
- Genus Fernandezia Ruiz & Pavon, 1794
- Genus Ferruminaria L.A. Garay, F. Hamer & E.S. Siegerist, 1994
- Genus Fialaara Hort., 1989
- Genus Fieldia Gaudichaud-Beaupré in Freycinet, 1829 accepted as Vandopsis Pfitzer in Engler & Prantl, 1889
- Genus Fimbriella O.A. Farwell ex F. Butzin, 1981
- Genus Finetia Schlechter, 1918 accepted as Neofinetia H.H. Hu, 1925
- Genus Fingardia D.L. Szlachetko, 1995
- Genus Fisherara J.M.H. Shaw, 2003
- Genus Fissipes J.K. Small, 1903 accepted as Cypripedium Linnaeus, 1753
- Genus Fitzgeraldia F. von Mueller, 1882
- Genus Fletcherara J.M.H. Shaw, 2011
- Genus Flickingeria A.D. Hawkes, 1961
- Genus Forbesina Ridley, 1925
- Genus Fordyceara Hort., 1994
- Genus Forficaria J. Lindley, 1838 accepted as Disa P.J. Bergius, 1767
- Genus Forgetara Hort., 1972
- Genus Forsterara J.M.H. Shaw, 2004 accepted as Forsterara J.M.H. Shaw, 2005
- Genus Forsterara J.M.H. Shaw, 2005
- Genus Fournierara J.M.H. Shaw, 2008
- Genus Fowlerara J.M.H. Shaw, 2009
- Genus Fowlieara J.M.H. Shaw, 2009
- Genus Fractiunguis Schlechter, 1922 accepted as Reichenbachanthus Barbosa Rodrigues, 1882
- Genus Frankquintalara K. Quintal & J.M.H. Shaw, 2022
- Genus Fredclarkeara F.W. Clarke & J.M.H. Shaw, 2003
- Genus Fredschechterara F. Schechter & J.M.H. Shaw, 2002
- Genus Freedara Hort., 1977
- Genus Fregea H.G. Reichenbach, 1852 accepted as Sobralia Ruiz & Pavon, 1794
- Genus Frezierara J.M.H. Shaw, 2005
- Genus Frezierara J.M.H. Shaw, 2004 accepted as Frezierara J.M.H. Shaw, 2005
- Genus Friedaara W. Duckitt, 2009
- Genus Frigidorchis Z.J. Liu & X. Qi Chen, 2007
- Genus Froebelara H. Griffits & J.M.H. Shaw, 2007
- Genus Frondaria C.A. Luer, 1986
- Genus Froscula Rafinesque, 1838 accepted as Dendrobium O. Swartz, 1799
- Genus Fruticicola (F.R.R. Schlechter) M.A. Clements & D.L. Jones, 2002 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Fuchsara R.F. Fuchs & J.M.H. Shaw, 2003
- Genus Fuertesiella Schlechter in Urban, 1913
- Genus Fujioara Hort., 1974
- Genus Fujiwarara Hort., 1963
- Genus Fulaichangara J.M.H. Shaw, 2009
- Genus Funara C.E. Fun, 2023
- Genus Funckiella Schlechter accepted as Funkiella Schlechter, 1920
- Genus Funkiella Schlechter, 1920
- Genus Gabertia Gaudichaud-Beaupré in Freycinet, 1829 accepted as Grammatophyllum Blume, 1825
- Genus Galabstia J.M.H. Shaw, 2003
- Genus Galeandra Lindley in F.A. Bauer & Lindley, 1832
- Genus Galeansellia Hort., 1981
- Genus Galearis Rafinesque, 1833(?)
- Genus Galeodes R. Levy & J.M.H. Shaw, 2002
- Genus Galeoglossum A. Richard & H.G. Galeotti, 1845 accepted as Prescottia J. Lindley in W.J. Hooker, 1824
- Genus Galeola Loureiro, 1790
- Genus Galeomannia J.M.H. Shaw, 2022
- Genus Galeomenetalum J.M.H. Shaw, 2016
- Genus Galeonisia G. Monnier & J.M.H. Shaw, 2004
- Genus Galeopetalum P.F. Hunt, 1992
- Genus Galeorchis P.A. Rydberg in N.L. Britton, 1901 accepted as Orchis Linnaeus, 1753
- Genus Galeosepalum P.F. Hunt, 1992
- Genus Galeottia A. Richard & H.G. Galeotti, 1845
- Genus Galeottiella Schlechter, 1920
- Genus Galera Blume, 1825 accepted as Epipogium Gmelin ex Borkhausen, 1792
- Genus Galiczella J.M.H. Shaw, 2010
- Genus Gamaria C.S. Rafinesque, 1838 accepted as Disa P.J. Bergius, 1767
- Genus Gamoplexis Falconer, 1847 accepted as Gastrodia R. Brown, 1810
- Genus Gamosepalum Schlechter, 1920 accepted as Aulosepalum L.A. Garay, 1982
- Genus Garaya D.L. Szlachetko, 1993 accepted as Mesadenella Pabst & Garay, 1953
- Genus Garayanthus D.L. Szlachetko, 1995
- Genus Garayara G.W. Dillon, 1969
- Genus Garayella F.G. Brieger, 1977 accepted as Chamelophyton Garay, 1974
- Genus Garlippara J.M.H. Shaw, 2009
- Genus Gastisia Hort., 1977
- Genus Gastisocalpa Hort., 1987
- Genus Gastorchis L.M.A. du P. Thouars, 1822 accepted as Phaius Loureiro, 1790
- Genus Gastorkis L.M.A.A. Du Petit-Thouars, 1809
- Genus Gastranda J.M.H. Shaw, 2013
- Genus Gastritis Hort., 1982
- Genus Gastrocalanthe A.D. Hawkes, 1952
- Genus Gastrocalpa M.Z. Huang, 2020
- Genus Gastrochiloglottis Hort., 1979
- Genus Gastrochilus D. Don, 1825
- Genus Gastrodia R. Brown, 1810
- Genus Gastroglottis Blume, 1825 accepted as Liparis L.C. Richard, 1817
- Genus Gastronopsis J.M.H. Shaw, 2013
- Genus Gastrophaianthe J.M.H. Shaw, 2011
- Genus Gastrophaius A.D. Hawkes, 1952
- Genus Gastropodium J. Lindley, 1845
- Genus Gastrorchis Schlechter, 1924
- Genus Gastrorkis F.R.R. Schlechter, 1924 accepted as Gastrorchis Schlechter, 1924
- Genus Gastrosarcochilus Hort., 1975
- Genus Gastrosiphon (F.R.R. Schlechter) M.A. Clements & D.L. Jones, 2002 accepted as Corybas R.A. Salisbury, 1807
- Genus Gastrostoma Hort., 1994
- Genus Gastrothera Hort., 1983
- Genus Gastruisinda J.M.H. Shaw, 2013
- Genus Gauntlettara Hort., 1966
- Genus Gavilea Poeppig, 1833
- Genus Geesinkorchis E.F. de Vogel, 1984 accepted as Coelogyne J. Lindley, 1821?
- Genus Geissanthera Schlechter in K.M. Schumann & Lauterbach, 1905 accepted as Microtatorchis Schlechter in K.M. Schumann & Lauterbach, 1905
- Genus Gennaria Parlatore, 1860
- Genus Genoplesium R. Brown, 1810
- Genus Genyorchis Schlechter, 1900
- Genus Geobina Rafinesque, 1838 accepted as Goodyera R. Brown in W.T. Aiton, 1813
- Genus Geoblasta Barbosa Rodrigues, 1891
- Genus Geocalpa F.G. Brieger in F.G. Brieger et al., 1975 accepted as Pleurothallis R. Brown in W.T. Aiton, 1813
- Genus Geoclades A. Chen, 2008
- Genus Geodorum G. Jackson in H.C. Andrews, 1811
- Genus Geolophia N. Potapohn, 2023
- Genus Georchis J. Lindley, 1833 accepted as Goodyera R. Brown in W.T. Aiton, 1813
- Genus Georgeblackara Hort., 1989
- Genus Georgecarrara J.M.H. Shaw, 2011
- Genus Georgefara J.M.H. Shaw, 2017
- Genus Gerardusara J.M.H. Shaw, 2009
- Genus Gersinia Néraud in Gaudichaud-Beaupré in Freycinet, 1826 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Ghiesbreghtia A. Richard & H.G. Galeotti, 1845 accepted as Calanthe R. Brown, 1821
- Genus Ghillanyara J.M.H. Shaw, 2009
- Genus Gibezara J.M.H. Shaw, 2008
- Genus Giddingsara G.W. Dillon, 1969
- Genus Gigara Hort., 1999
- Genus Gigliolia Barbosa Rodrigues, 1877 accepted as Octomeria R. Brown in W.T. Aiton, 1813
- Genus Gilmourara L.A. Garay & H.R. Sweet, 1969
- Genus Ginesara J.F. Jusczak, 2020
- Genus Giulianettia Rolfe, 1899 accepted as Glossorhyncha Ridley, 1891
- Genus Gladysyeeara Hort., 1994
- Genus Glanzara Hort., 1994
- Genus Glicensteinara J.M.H. Shaw, 2009
- Genus Glomera Blume, 1825
- Genus Glossadenia J. Kavulak, 1986
- Genus Glossadenia Hort. ex J.M.H. Shaw, 2014
- Genus Glossapis K.P.J. Sprengel accepted as Glossaspis K.P.J. Sprengel, 1826
- Genus Glossaspis K.P.J. Sprengel, 1826 accepted as Habenaria Willdenow, 1805
- Genus Glossochilopsis D.L. Szlachetko, 1995
- Genus Glossodia R. Brown, 1810
- Genus Glossorhyncha Ridley, 1891
- Genus Glossula J. Lindley, 1825 accepted as Habenaria Willdenow, 1805
- Genus Glottisarcon D.L. Szlachetko & M. Kolanowska, 2019
- Genus Glycorchis D.L. Jones & M.A. Clements, 2001 accepted as Caladenia R. Brown, 1810
- Genus Goadbyella R.S. Rogers, 1927 accepted as Microtis R. Brown, 1810
- Genus Goffara Hort., 1973
- Genus Gohartia Hort., 1989
- Genus Goldnerara J. Dunkelberger, 2009
- Genus Goldnerara J. Dunkelberger, 2010
- Genus Goldschmidtia C.L.U. Dammer, 1910 accepted as Dendrobium O. Swartz, 1799
- Genus Golumnia J.M.H. Shaw, 2004 accepted as Golumnia J.M.H. Shaw, 2005
- Genus Golumnia J.M.H. Shaw, 2005
- Genus Gomada Hort., 1991
- Genus Gomadachtia J.M.H. Shaw, 2002
- Genus Gombrassiltonia J.M.H. Shaw, 2010
- Genus Gomcentridium J.M.H. Shaw, 2011
- Genus Gomcidettia J.M.H. Shaw, 2011
- Genus Gomcidumnia J.M.H. Shaw, 2011
- Genus Gomenkoa J.M.H. Shaw, 2005
- Genus Gomenkoa W. Savage & J.M.H. Shaw, 2004 accepted as Gomenkoa J.M.H. Shaw, 2005
- Genus Gomesa R. Brown in J. Sims, 1815
- Genus Gomesia C.P.J. Sprengel, 1826 accepted as Gomesa R. Brown in J. Sims, 1815
- Genus Gomesochiloglossum J.M.H. Shaw, 2009
- Genus Gomesochilum J.M.H. Shaw, 2009
- Genus Gomessiastele J.M.H. Shaw, 2011
- Genus Gomestele J.M.H. Shaw, 2010
- Genus Gomettia Hort., 1989
- Genus Gomezia F.G. Bartling, 1830 accepted as Gomesa R. Brown in J. Sims, 1815
- Genus Gomezina J.M.H. Shaw, 2010
- Genus Gomguezia J.M.H. Shaw, 2005
- Genus Gomguezia J.M.H. Shaw, 2004 accepted as Gomguezia J.M.H. Shaw, 2005
- Genus Gomiltidium J.M.H. Shaw, 2011
- Genus Gomiltlauzina J.M.H. Shaw, 2010
- Genus Gomiltostele J.M.H. Shaw, 2010
- Genus Gomocentrum J.M.H. Shaw, 2009
- Genus Gomochilus Hort., 1983
- Genus Gomoglossum Hort., 1986
- Genus Gomoncidochilum J.M.H. Shaw, 2009
- Genus Gomonia J.M.H. Shaw, 2004
- Genus Gomoniopcidium J.M.H. Shaw, 2011
- Genus Gomopsiella J.M.H. Shaw, 2014
- Genus Gompassia J.M.H. Shaw, 2011
- Genus Gomphichis Lindley, 1840
- Genus Gomphocentrum (Bentham) D.L. Szlachetko, J. Mytnik-Ejsmont & E. Grochocka, 2013 accepted as Angraecum Bory de St.-Vincent, 1804
- Genus Gomphostylis Wallich ex Lindley, 1830
- Genus Gomstelettia J.M.H. Shaw, 2010
- Genus Gonatostylis Schlechter, 1906
- Genus Gonginia J.M.H. Shaw, 2004 accepted as Gonginia J.M.H. Shaw, 2005
- Genus Gonginia J.M.H. Shaw, 2005
- Genus Gongomannia J.M.H. Shaw, 2023
- Genus Gongora Ruiz & Pavon, 1794
- Genus Gongorhaea R. Vacherot, 2005
- Genus Gongryanthopea J.M.H. Shaw, 2016
- Genus Goniochilus M.W. Chase, 1987
- Genus Gonogona Link, 1822 accepted as Goodyera R. Brown in W.T. Aiton, 1813
- Genus Gonraemia J.M.H. Shaw, 2019
- Genus Goodaleara Hort., 1976
- Genus Goodalemoirara J.M.H. Shaw, 2013
- Genus Goodisachilus L. Glicenstein & J.M.H. Shaw
- Genus Goodisia L. Glicenstein & J.M.H. Shaw
- Genus Goodsonara H. Griffits & J.M.H. Shaw, 2008
- Genus Goodyera R. Brown in W.T. Aiton, 1813
- Genus Gorgoglossum F.C. Lehmann, 1897 accepted as Sievekingia H.G. Reichenbach, 1871
- Genus Gorskiara W. Gorski, 2023
- Genus Gosseara J.M.H. Shaw, 2007
- Genus Gotokoa J.M.H. Shaw, 2010
- Genus Gottererara Hort., 1978
- Genus Gottoara J.M.H. Shaw, 2008
- Genus Govenia J. Lindley, 1832
- Genus Govindooia R. Wight, 1853 accepted as Tropidia J. Lindley, 1833
- Genus Gracielanthus R. Gonzales & D.L. Szlachetko, 1995 accepted as Aulosepalum L.A. Garay, 1982
- Genus Grafara J.M.H. Shaw, 2018
- Genus Grafia A.D. Hawkes, 1966 accepted as Phalaenopsis Blume, 1825
- Genus Graireara J.M.H. Shaw, 2011
- Genus Gramcymbimangis A. Chen, 2011
- Genus Gramcymbiphia A. Chen, 2011
- Genus Gramenaria J.M.H. Shaw, 2018
- Genus Grammandium S. Li, 2019
- Genus Grammangis H.G. Reichenbach, 1860
- Genus Grammatocymbidium Hort., 1922
- Genus Grammatoheadia Hort., 1995
- Genus Grammatophyllum Blume, 1825
- Genus Grammatopodium Hort., 1992
- Genus Grammoglottis Y.T. Wing, 2005
- Genus Grammothecopus J.M.H. Shaw, 2011
- Genus Grandicentrum J.M.H. Shaw, 2011
- Genus Grandichopsis J.M.H. Shaw, 2022
- Genus Grandicidium J.M.H. Shaw, 2011
- Genus Grandicopsis J.M.H. Shaw, 2022 accepted as Grandichopsis J.M.H. Shaw, 2022
- Genus Grandiphyllum A. Docha Neto, 2006
- Genus Graphiella Hort., 1988
- Genus Graphophia J.M.H. Shaw, 2020
- Genus Graphorchis L.M.A.A. Du Petit-Thouars, 1822
- Genus Graphorkis L.M.A.A. Du Petit-Thouars, 1809
- Genus Grastidium Blume, 1825
- Genus Gratrixara J.M.H. Shaw, 2007
- Genus Gravendeelia D. Bogarín & A.P. Karremans in Bogarín et al., 2018
- Genus Grayara J.M.H. Shaw, 2004
- Genus Greatwoodara L.A. Garay & H.R. Sweet, 1969
- Genus Greenwoodia P. Burns-Balogh, 1986 accepted as Kionophyton L.A. Garay, 1982
- Genus Greenwoodiella G.A. Salazar, T.J. Hernández-López & J. Sharma, 2016
- Genus Grobya J. Lindley, 1835
- Genus Groganara J.M.H. Shaw, 2008
- Genus Grosourdya H.G. Reichenbach, 1864
- Genus Grussia M. Wolff, 2007 accepted as Phalaenopsis Blume, 1825
- Genus Guanchezia G.A. Romero & G. Carnevali, 2000 accepted as Bifrenaria J. Lindley, 1832
- Genus Guarcholia H. Griffits & J.M.H. Shaw, 2007
- Genus Guarcyclinitis J.M.H. Shaw, 2007
- Genus Guarechea J.M.H. Shaw, 2007
- Genus Guarianthe R.L. Dressler & W.E. Higgins, 2003
- Genus Guariburgkia J.M.H. Shaw, 2003
- Genus Guaricatophila J.M.H. Shaw, 2007
- Genus Guaricattonia J.M.H. Shaw, 2003
- Genus Guarichile J.M.H. Shaw, 2013
- Genus Guaricyclia J.M.H. Shaw, 2003
- Genus Guaridendrum J.M.H. Shaw, 2003
- Genus Guariencychea J.M.H. Shaw, 2008
- Genus Guarilaeliarthron J.M.H. Shaw, 2007
- Genus Guarilaelivola J.M.H. Shaw, 2007
- Genus Guarimicra J.M.H. Shaw, 2007
- Genus Guarischomtonia J.M.H. Shaw, 2017
- Genus Guarisophilia J.M.H. Shaw, 2007
- Genus Guarisophleya J.M.H. Shaw, 2003
- Genus Guaritonia J.M.H. Shaw, 2003
- Genus Guaritoniclia J.M.H. Shaw, 2008
- Genus Guarlaeburgkia J.M.H. Shaw, 2017
- Genus Guarlaeliopsis J.M.H. Shaw, 2003
- Genus Guaronilia J.M.H. Shaw, 2008
- Genus Guarophidendrum J.M.H. Shaw, 2007
- Genus Guarthroleya J.M.H. Shaw, 2007
- Genus Guarthron J.M.H. Shaw, 2003
- Genus Guartonichea J.M.H. Shaw, 2008
- Genus Guartonichea J.M.H. Shaw, 2008, nom. inval. accepted as Guartonichea J.M.H. Shaw, 2008
- Genus Guarvolclia J.M.H. Shaw, 2007
- Genus Gudrunia G.J. Braem, 1993
- Genus Gularia L.A. Garay, 1982 accepted as Schiedeella Schlechter, 1920
- Genus Gumara Hort., 1994
- Genus Gunnarella K. Senghas, 1988
- Genus Gunnaria S.C. Chen ex Z.J. Liu & L.J. Chen, 2009
- Genus Gunnarorchis F.G. Brieger in F.G. Brieger et al., 1981
- Genus Gunnia Lindley, 1834 accepted as Sarcochilus R. Brown, 1810
- Genus Gurneyara J.M.H. Shaw, 2009
- Genus Gussonea A. Richard, 1828 accepted as Solenangis Schlechter, 1918
- Genus Gyaladenia Schlechter, 1921 accepted as Brachycorythis J. Lindley, 1838
- Genus Gyas R.A. Salisbury, 1812 accepted as Bletia Ruiz & Pavón, 1794
- Genus Gymleucorchis Hort., 1925 accepted as Pseudadenia P.F. Hunt, 1971
- Genus Gymnabicchia E.G. Camus, Bergon & A. Camus in A. Camus & E.G. Camus, 1908
- Genus Gymnacamptis Hort., 1951 accepted as Gymnanacamptis P. Ascherson & P. Graebner, 1907
- Genus Gymnadenia R. Brown in W.T. Aiton, 1813
- Genus Gymnadeniopsis P.A. Rydberg in N.L. Britton, 1901 accepted as Platanthera L.C. Richard, 1817
- Genus Gymnadeniorchis A.D. Hawkes, 1965
- Genus Gymnaglossum Rolfe, 1919
- Genus Gymnanacamptis P. Ascherson & P. Graebner, 1907
- Genus Gymnaplatanthera Lambert, 1907 accepted as Gymplatanthera E.G. Camus, 1906
- Genus Gymnigritella E.G. Camus, 1892
- Genus Gymnochilus Blume, 1859 accepted as Cheirostylis Blume, 1825
- Genus Gymnorchis Osvacil ex Dostál, 1950
- Genus Gymnotraunsteinera Ciferri & Giacomini, 1950
- Genus Gymplatanthera E.G. Camus, 1906
- Genus Gynizodon Rafinesque, 1838 accepted as Oncidium O. Swartz, 1800
- Genus Gynoglottis J.J. Smith, 1904 accepted as Coelogyne J. Lindley, 1821?
- Genus Gyrostachis C.L. von Blume accepted as Spiranthes L.C. Richard, 1817
- Genus Gyrostachys Persoon ex Blume, 1859 accepted as Spiranthes L.C. Richard, 1817
- Genus Habenaria Willdenow, 1805
- Genus Habenaria Nimmo accepted as Habenaria Willdenow, 1805
- Genus Habenariorchis R.A. Rolfe, 1892 accepted as Habenari-orchis R.A. Rolfe, 1892
- Genus Habenari-orchis R.A. Rolfe, 1892
- Genus Habenella J.K. Small, 1903 accepted as Habenaria Willdenow, 1805
- Genus Habenorkis Du Petit-Thouars, 1809 accepted as Habenaria Willdenow, 1805
- Genus Habenorkis R. van Vugt, 2009
- Genus Hackerara J.M.H. Shaw, 2004
- Genus Hadrangis (F.R.R. Schlechter) D.L. Szlachetko, J. Mytnik-Ejsmont & E. Grochocka, 2013 accepted as Angraecum Bory de St.-Vincent, 1804
- Genus Haemaria Lindley, 1833 accepted as Ludisia A. Richard in Bory de St.-Vincent, 1825
- Genus Haematorchis C.L. von Blume, 1849 accepted as Galeola Loureiro, 1790
- Genus Hagerara Hort., 1973
- Genus Hagsatera R. González, 1974
- Genus Hagsavola J.M.H. Shaw, 2005
- Genus Hagsechea J.M.H. Shaw, 2005
- Genus Hakoneaste F. Maekawa, 1935 accepted as Ephippianthus H.G. Reichenbach, 1868
- Genus Hallackia W.H. Harvey, 1863
- Genus Halleorchis D.L. Szlachetko & T.S. Olszewski, 1998
- Genus Hamelwellsara Hort., 1980
- Genus Hamerara J.M.H. Shaw, 2011
- Genus Hamiltonara Hort., 1994
- Genus Hammarbya O. Kuntze, 1891 accepted as Malaxis Solander ex O. Swartz, 1788
- Genus Hanburyara J.M.H. Shaw, 2007
- Genus Hancockia Rolfe, 1903
- Genus Hanesara Hort., 1977
- Genus Haniffara J.M.H. Shaw, 2010
- Genus Hansenara Z.-H. Feng & J.M.H. Shaw, 2022
- Genus Hapalochilus (Schlechter) K. Senghas, 1978
- Genus Hapalorchis Schlechter, 1919
- Genus Haplochilus Endlicher, 1841 accepted as Zeuxine Lindley, 1826
- Genus Haplostelis H.G.L. Reichenbach, 1841 accepted as Nervilia Commerson ex Gaudichaud-Beaupré in Freycinet, 1829
- Genus Haplostellis S.F.L. Endlicher, 1837 accepted as Nervilia Commerson ex Gaudichaud-Beaupré in Freycinet, 1829
- Genus Haraella Y. Kudo, 1930 accepted as Gastrochilus D. Don, 1825
- Genus Haraenopsis Z. Chen, 2005
- Genus Hardingia A. Docha Neto & D.H. Baptista, 2011 accepted as Gomesa R. Brown in J. Sims, 1815
- Genus Harrisara H. Griffits & J.M.H. Shaw, 2007
- Genus Harrisella Fawcett & Rendle, 1909
- Genus Hartara Hort., 1965
- Genus Hartwegia J. Lindley, 1837 accepted as Nageliella L.O. Williams, 1940
- Genus Harveyara J.M.H. Shaw, 2011
- Genus Hasegawaara Hort., 1983
- Genus Hattoriara Hort., 1984
- Genus Hausermannara Hort., 1974
- Genus Hawaiiara Hort., 1959
- Genus Hawkesara Hort., 1968
- Genus Hawkinsara Hort., 1977
- Genus Hayata L.V. Averyanov, 2009 accepted as Cheirostylis Blume, 1825
- Genus Haywoodara H. Griffits & J.M.H. Shaw, 2007
- Genus Hecabe Rafinesque, 1838 accepted as Phaius Loureiro, 1790
- Genus Hederorkis Du Petit-Thouars, 1809
- Genus Helcia J. Lindley, 1845
- Genus Helenadamsara J.M.H. Shaw, 2009
- Genus Helictonia J.K. Ehrhart, 1789 accepted as Spiranthes L.C. Richard, 1817
- Genus Helleborine Moench, 1794
- Genus Helleborine P. Miller, 1754
- Genus Helleborine O. Kuntze, 1891 accepted as Calopogon R. Brown in W.T. Aiton, 1813
- Genus Helleriella A.D. Hawkes in A.H. Heller & A.D. Hawkes, 1966
- Genus Hellerorchis Hawkes, 1959 accepted as Rodrigueziella O. Kuntze, 1891
- Genus Helonoma L.A. Garay, 1982
- Genus Helorchis Schlechter, 1924 accepted as Cynorkis Du Petit-Thouars, 1809
- Genus Helpilia Hort., 1987
- Genus Hemihabenaria Finet, 1901
- Genus Hemiperis Frappier ex E. Jacob de Cordemoy, 1895 accepted as Habenaria Willdenow, 1805
- Genus Hemipilia J. Lindley, 1835
- Genus Hemipiliopsis Y.B. Luo & S.C. Chen, 2003
- Genus Hemiscleria Lindley, 1853 accepted as Epidendrum Linnaeus, 1763
- Genus Henosis J.D. Hooker, 1890 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Henriqueara R. Romero, 2019
- Genus Herbertara Hort., 1968
- Genus Hermansia D.L. Szlachetko, J. Mytnik-Ejsmont & E. Grochocka, 2013 accepted as Angraecum Bory de St.-Vincent, 1804
- Genus Hermibicchia E.G. Camus, Bergon & A. Camus in A. Camus & E.G. Camus, 1908
- Genus Hermileucorchis Ciferri & Giacomini, 1950
- Genus Herminiorchis A. Foerster, 1878 accepted as Herminium Linnaeus, 1758
- Genus Herminium Linnaeus, 1758
- Genus Herminium Guettard, 1754
- Genus Herminorchis P.V. Fournier, 1935
- Genus Hermoara J.M.H. Shaw, 2007
- Genus Hermorchis J.M.H. Shaw, 2003
- Genus Heromeulenia P. Delforge, 2009 accepted as Anacamptis L.C. Richard, 1817
- Genus Heropaludorchis P. Delforge, 2009 accepted as Anacamptis L.C. Richard, 1817
- Genus Herorchis D. Tyteca & E. Klein, 2008 accepted as Anacamptis L.C. Richard, 1817
- Genus Herorchiserapias P. Delforge, 2009 accepted as Serapicamptis Godfery, 1921
- Genus Herpethophytum (Schlechter) F.G. Brieger in F.G. Brieger et al., 1981
- Genus Herpetophytum (F.R.R. Schlechter) F.G. Brieger, 1981 accepted as Dendrobium O. Swartz, 1799
- Genus Herpysma J. Lindley, 1833
- Genus Herreraara J.M.H. Shaw, 2011
- Genus Herschelia J. Lindley, 1838 accepted as Disa P.J. Bergius, 1767
- Genus Herschelianthe S. Rauschert, 1983 accepted as Disa P.J. Bergius, 1767
- Genus Herscheliodisa H.P. Linder, 1985
- Genus Hertensteinara J.M.H. Shaw, 2002
- Genus Hetaeria Blume, 1825
- Genus Heteranthocidium D.L. Szlachetko, J. Mytnik-Ejsmont & A. Romowicz, 2006 accepted as Oncidium O. Swartz, 1800
- Genus Heterotaxis J. Lindley, 1826
- Genus Heterozeuxine T. Hashimoto, 1986 accepted as Zeuxine Lindley, 1826
- Genus Hexadesmia A.T. Brongniart, 1842 accepted as Scaphyglottis Poeppig & Endlicher, 1836
- Genus Hexalectris Rafinesque, 1825
- Genus Hexameria R. Brown in J.J. Bennett & R. Brown, 1838 accepted as Podochilus Blume, 1825
- Genus Hexisea Lindley, 1834
- Genus Hexopia J. Bateman ex J. Lindley, 1844 accepted as Scaphyglottis Poeppig & Endlicher, 1836
- Genus Heynholdara J.M.H. Shaw, 2011
- Genus Hiattara J.M.H. Shaw, 2009
- Genus Hibiscorchis F. Archila & V. Bertolini, 2014 accepted as Dendrobium O. Swartz, 1799
- Genus Higashiara Hort., 1984
- Genus Higginsara J.M.H. Shaw, 2013
- Genus Hildaara Hort., 1975
- Genus Himantoglossum K.P.J. Sprengel, 1826
- Genus Himantoglossum W.D.J. Koch, 1837
- Genus Himoriara Hort., 1978
- Genus Hintonella O. Ames, 1938
- Genus Hippeophyllum Schlechter in K.M. Schumann & Lauterbach, 1905
- Genus Hippoglossum Breda, 1829 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Hippopodium W. Harvey ex J. Lindley accepted as Ceratandra Lindley in F.A. Bauer & Lindley, 1838
- Genus Hipporkis Du Petit-Thouars, 1809 accepted as Satyrium O. Swartz, 1800
- Genus Hirayamaara S. Hirayama & J.M.H. Shaw, 2004
- Genus Hirtzia C.H. Dodson, 1984
- Genus Hispaniella G.J. Braem, 1980 accepted as Tolumnia Rafinesque, 1837
- Genus Hoehneara J.M.H. Shaw, 2013
- Genus Hoehneella A. Ruschi, 1945
- Genus Hoehnella D.L. Szlachetko & M. Sitko, 2012 accepted as Maxillaria Ruiz & Pavon, 1794
- Genus Hoffmannseggella H.G. Jones, 1968
- Genus Hofmannara J.M.H. Shaw, 2009
- Genus Hofmeistera H.G. Reichenbach, 1852 accepted as Hofmeisterella H.G. Reichenbach in Walpers, 1852
- Genus Hofmeisterella H.G. Reichenbach in Walpers, 1852
- Genus Holcanthe J.M.H. Shaw, 2013
- Genus Holcanthera L.A. Garay, 1972
- Genus Holcenda J.M.H. Shaw, 2003
- Genus Holcocentrum L.A. Garay, 1972
- Genus Holcofinetia L. Glicenstein, 2011
- Genus Holcoglossum Schlechter, 1919
- Genus Holcoglottis P. Rahthat, 2022
- Genus Holcograecum J.M.H. Shaw, 2013
- Genus Holconopsis L.A. Garay, 1972
- Genus Holcophalstylis J.M.H. Shaw, 2020
- Genus Holcopsis J.M.H. Shaw, 2003
- Genus Holcorides L.A. Garay, 1972
- Genus Holcosia J.M.H. Shaw, 2003
- Genus Holcosianda T.W. Yu, 2014
- Genus Holcostylis L.A. Garay, 1972
- Genus Holcovanstylis J.M.H. Shaw, 2013
- Genus Holfordara J.M.H. Shaw, 2007
- Genus Hollingtonara H. Griffits & J.M.H. Shaw, 2007
- Genus Holmara C. Holm & J.M.H. Shaw, 2001
- Genus Holmesia P.J. Cribb, 1977 accepted as Angraecopsis Kraenzlin, 1900
- Genus Hologyne Pfitzer in Engler, 1907 accepted as Coelogyne J. Lindley, 1821?
- Genus Holopogon V.L. Komarov & S.A. Nevski in V.L. Komarov, 1935 accepted as Neottia Guettard, 1754
- Genus Holothrix L.C. Richard ex J. Lindley, 1835
- Genus Holridestylis J.M.H. Shaw, 2017
- Genus Holttumara Hort., 1958
- Genus Holungara M. Liu, 2021
- Genus Homalopetalum Rolfe, 1896
- Genus Hookerara Hort., 1963
- Genus Hoosierara L. Glicenstein, 2013
- Genus Horichia R. Jenny, 1981
- Genus Hormidium (Lindley) G. Heynhold, 1841 accepted as Encyclia W.J. Hooker, 1828
- Genus Hornara J.M.H. Shaw, 2011
- Genus Horvatia L.A. Garay in L. Szabó, 1977 accepted as Bifrenaria J. Lindley, 1832
- Genus Houhopea L. Glicenstein, 2016
- Genus Houlletia A.T. Brongniart, 1841
- Genus Houllinia M. Turkel, 2013
- Genus Houllora Hort., 2000
- Genus Howeara Hort., 1976
- Genus Hrubyara J.M.H. Shaw, 2007
- Genus Hsenhsua X.H. Jin, A. Schuiteman & W.T. Jin, 2014
- Genus Huebneria Schlechter, 1925 accepted as Orleanesia Barbosa Rodrigues, 1877
- Genus Hueylihara Hort., 1971
- Genus Hueylihara L.A. Garay, 1972
- Genus Hugofreedara Hort., 1979
- Genus Humblotiangraecum (F.R.R. Schlechter) D.L. Szlachetko, J. Mytnik-Ejsmont & E. Grochocka, 2013 accepted as Angraecum Bory de St.-Vincent, 1804
- Genus Humboldtara J.M.H. Shaw, 2004 accepted as Humboldtara J.M.H. Shaw, 2005
- Genus Humboldtara J.M.H. Shaw, 2005
- Genus Humboldtia Ruiz & Pavon accepted as Humboltia Ruiz & Pavon, 1794
- Genus Humboltia Ruiz & Pavon, 1794 accepted as Stelis O. Swartz, 1800
- Genus Hummelara Hort., 1988
- Genus Huntara L.A. Garay & H.R. Sweet, 1969
- Genus Huntleanthes Hort., 1966
- Genus Huntleya Bateman ex J. Lindley, 1837
- Genus Huntzellanthes J.M.H. Shaw, 2012
- Genus Hunzella J.M.H. Shaw, 2010
- Genus Hurstara J.M.H. Shaw, 2008
- Genus Huttonaea W.H. Harvey, 1863
- Genus Hyacinthorchis Blume, 1849 accepted as Cremastra J. Lindley, 1833
- Genus Hyalosema (Schlechter) Rolfe, 1919 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Hybochilus Schlechter, 1920
- Genus Hydranthus H. Kuhl & J.C. van Hasselt ex H.G. Reichenbach, 1862 accepted as Dipodium R. Brown, 1810
- Genus Hydrorchis D.L. Jones & M.A. Clements in D.L. Jones, M.A. Clements, I.K. Sharma & A.M. Mackenzie, 2002 accepted as Microtis R. Brown, 1810
- Genus Hyeara J.M.H. Shaw, 2009
- Genus Hyedecromara J.M.H. Shaw, 2004 accepted as Hyedecromara J.M.H. Shaw, 2005
- Genus Hyedecromara J.M.H. Shaw, 2005
- Genus Hyerochilus Pfitzer accepted as Hygrochilus Pfitzer in Engler & Prantl, 1897
- Genus Hygranda J.M.H. Shaw, 2003
- Genus Hygrocenda J.M.H. Shaw, 2003
- Genus Hygrochilus Pfitzer in Engler & Prantl, 1897
- Genus Hygrodirea J.M.H. Shaw, 2003
- Genus Hylaeorchis G. Carnevali & G.A. Romero, 2000 accepted as Bifrenaria J. Lindley, 1832
- Genus Hylophila J. Lindley, 1833
- Genus Hymanthoglossum A. Todaro, 1842 accepted as Himantoglossum K.P.J. Sprengel, 1826
- Genus Hymeneria (J. Lindley) M.A. Clements & D.L. Jones, 2002 accepted as Pinalia J. Lindley, 1826
- Genus Hymenorchis Schlechter, 1913
- Genus Hypodema H.G.L. Reichenbach, 1841 accepted as Cypripedium Linnaeus, 1753
- Genus Hypodematium A. Richard, 1850 accepted as Eulophia R. Brown, 1821
- Genus Hysteria C.G.C. Reinwardt, 1825 accepted as Corymborkis Du Petit-Thouars, 1809
- Genus Iacovielloara Hort., 2000
- Genus Ianara M. Clark, 2010
- Genus Ianclarkara J.M.H. Shaw, 2010
- Genus Iantha W.J. Hooker, 1824 accepted as Ionopsis Kunth in Humboldt, Bonpland & Kunth, 1816
- Genus Ibidium R.A. Salisbury ex J.K. Small, 1913 accepted as Spiranthes L.C. Richard, 1817
- Genus Ichijoara J.M.H. Shaw, 2012
- Genus Ichthyostomum D.L. Jones, M.A. Clements & B.P.J. Molloy in M.A. Clements & D.L. Jones, 2002 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Idamoorea W. Jasen, 2020
- Genus Iebine Rafinesque, 1838 accepted as Liparis L.C. Richard, 1817
- Genus Ilonara J.M.H. Shaw, 2005
- Genus Ilonara W. Savage & J.M.H. Shaw, 2004 accepted as Ilonara J.M.H. Shaw, 2005
- Genus Imerinaea Schlechter, 1925
- Genus India A. Nageswara Rao, 1999
- Genus Ingeara R. Romero, 2020
- Genus Ingramara J.M.H. Shaw, 2007
- Genus Inobulbon Schlechter & Kränzlin in Engler, 1910
- Genus Inti M.A. Blanco, 2007
- Genus Ione Lindley, 1853 accepted as Sunipia J. Lindley, 1826
- Genus Ionettia Hort., 1968
- Genus Ionmesa J.M.H. Shaw, 2011
- Genus Ionmesettia J.M.H. Shaw, 2011
- Genus Ionocentrum J.M.H. Shaw, 2004
- Genus Ionocidium Hort., 1968
- Genus Ionomesidium J.M.H. Shaw, 2021
- Genus Ionopsis Kunth in Humboldt, Bonpland & Kunth, 1816
- Genus Ionorchis G. Beck von Mannagetta und Lerchenau, 1890 accepted as Limodorum Boehmer in C.G. Ludwig, 1760
- Genus Ionparettichilum J.M.H. Shaw, 2009
- Genus Ionumnia J.M.H. Shaw, 2004 accepted as Ionumnia J.M.H. Shaw, 2005
- Genus Ionumnia J.M.H. Shaw, 2005
- Genus Ipsea Lindley, 1831
- Genus Iquitoa C.H. Dodson, 1993
- Genus Irenea D.L. Szlachetko, J. Mytnik-Ejsmont, M. Górniak & A. Romowicz, 2006 accepted as Cyrtochilum Kunth in Humboldt, Bonpland & Kunth, 1816
- Genus Iridorchis Blume, 1859 accepted as Cymbidium O. Swartz, 1799
- Genus Iridorkis L.M.A.A. Du Petit-Thouars, 1809 accepted as Oberonia Lindley, 1830
- Genus Irvingara Hort., 1977
- Genus Isabelia Barbosa Rodrigues, 1877
- Genus Isadendrum J.M.H. Shaw, 2008
- Genus Isanitella M. Leinig, 1971
- Genus Isaoara Hort., 1981
- Genus Ischnocentrum Schlechter, 1912 accepted as Glomera Blume, 1825
- Genus Ischnogyne Schlechter, 1913 accepted as Coelogyne J. Lindley, 1821?
- Genus Isias De Notaris, 1844
- Genus Isochilostachya J. Mytnik-Ejsmont & D.L. Szlachetko, 2011 accepted as Polystachya W.J. Hooker, 1824
- Genus Isochilus R. Brown in W.T. Aiton, 1813
- Genus Isotria Rafinesque, 1808
- Genus Itaculumia Hoehne, 1936 accepted as Habenaria Willdenow, 1805
- Genus Iwanagaara R.A. Rolfe, 1896
- Genus Iwanagara R.A. Rolfe, 1896 accepted as Iwanagaara R.A. Rolfe, 1896
- Genus Iwanagara Hort., 1960
- Genus Izumiara Hort., 1978
- Genus Jackfowlieara J.M.H. Shaw, 2009
- Genus Jacquinara J.M.H. Shaw, 2008
- Genus Jacquiniella Schlechter, 1920
- Genus Jamaiciella G.J. Braem, 1980 accepted as Tolumnia Rafinesque, 1837
- Genus Jamesonara J.M.H. Shaw, 2011
- Genus Jansenia Barbosa Rodrigues, 1891 accepted as Plectrophora Focke, 1848
- Genus Janssenara J.M.H. Shaw, 2008
- Genus Jasenara W. Jasen, 2021
- Genus Javieria F. Archila, G.R. Chiron & D.L. Szlachetko, 2013
- Genus Jeaneara G. Monnier & J.M.H. Shaw, 2004
- Genus Jejewoodia D.L. Szlachetko, 1995
- Genus Jejosephia A. Nageswara Rao & K.J. Mani, 1986
- Genus Jenmania Rolfe, 1898 accepted as Palmorchis Barbosa Rodrigues, 1877
- Genus Jensoa Rafinesque, 1838 accepted as Cymbidium O. Swartz, 1799
- Genus Jesupara L. Glicenstein, 2018, nom. inval. accepted as Jesupara L. Glicenstein, 2018
- Genus Jesupara L. Glicenstein, 2018
- Genus Jewellara Hort., 1981
- Genus Jimenezara Hort., 1973
- Genus Jimensia Rafinesque, 1838 accepted as Bletilla H.G. Reichenbach, 1852-1853
- Genus Jimrobertsara J.M.H. Shaw, 2018
- Genus Jisooara J.M.H. Shaw, 2003
- Genus Joannara Hort., 1973
- Genus Johnara J.M.H. Shaw, 2003
- Genus Johnkellyara Hort., 1983
- Genus Johnlagerara J.M.H. Shaw, 2009
- Genus Johnsonara J.M.H. Shaw, 2002
- Genus Johnyeeara Hort., 1988
- Genus Jolyara J.M.H. Shaw, 2011
- Genus Jomkhwanara P. Thawatchainant, 2012
- Genus Jonesiopchis J.M.H. Shaw, 2015
- Genus Jonesyella D.L. Szlachetko, 2001 accepted as Caladenia R. Brown, 1810
- Genus Jonorchis G. Beck von Mannagetta, 1890
- Genus Jonorchis J.M.H. Shaw, 2014
- Genus Josephara J.M.H. Shaw, 2011
- Genus Josephia R. Wight, 1851 accepted as Sirhookera O. Kuntze, 1891
- Genus Jostia C.A. Luer, 2000
- Genus Jumangis J.M.H. Shaw, 2018
- Genus Jumanthes Hort., 1982
- Genus Jumellea Schlechter, 1914
- Genus Jungara C.C. Tsai, 2012
- Genus Kaedingara J. Kaeding, 2021
- Genus Kaenratanaara K. Kaenratana, 2023
- Genus Kagawara Hort., 1968
- Genus Kalakauara G.F. Carr & J.M.H. Shaw, 2002
- Genus Kalimantanorchis H. Tsukaya, M. Nakajima & H. Okada, 2011
- Genus Kalimpongia U.C. Pradhan, 1977 accepted as Dickasonia L.O. Williams, 1941
- Genus Kalopternix Garay & Dunsterville in Dunsterville & Garay, 1976 accepted as Epidendrum Linnaeus, 1763
- Genus Kamemotoara L.A. Garay & H.R. Sweet, 1969
- Genus Kanzerara Hort., 1985
- Genus Karma A.P. Karremans, 2023
- Genus Karorchis D.L. Jones & M.A. Clements in M.A. Clements & D.L. Jones, 2002 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Katherinea A.D. Hawkes, 1956 accepted as Epigeneium Gagnepain, 1932
- Genus Kaurorchis D.L. Jones & M.A. Clements in M.A. Clements & D.L. Jones, 2002 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Kautskyara J.M.H. Shaw, 2009
- Genus Kawamotoara Hort., 1978
- Genus Kawanishiara L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Keferanthes Hort., 1983
- Genus Keferella E.E. Michel, L. Glicenstein & J.M.H. Shaw, 2003
- Genus Kefericzella J.M.H. Shaw, 2010
- Genus Kefernaea L. Glicenstein, 2020
- Genus Keferollea J.M.H. Shaw, 2004, nom. inval. accepted as Keferollea J.M.H. Shaw, 2004
- Genus Keferollea J.M.H. Shaw, 2004
- Genus Kefersteinia H.G. Reichenbach, 1852
- Genus Keforea Hort., 1997
- Genus Keftorella J.M.H. Shaw, 2010
- Genus Kegelia H.G. Reichenbach, 1852 accepted as Kegeliella Mansfeld, 1934
- Genus Kegeliella Mansfeld, 1934
- Genus Kegeopea L. Glicenstein, 2012
- Genus Keishunhattoriara J.M.H. Shaw, 2013
- Genus Kenmeierara L. Glicenstein, 2019
- Genus Kennethbealeara J.M.H. Shaw, 2013
- Genus Kerigomnia P. van Royen, 1976 accepted as Chitonanthera Schlechter in K.M. Schumann & Lauterbach, 1905
- Genus Keyesara J.M.H. Shaw, 2009
- Genus Khiamara J.M.H. Shaw, 2013
- Genus Kiattanara T.W. Yam, 2012
- Genus Kimballara H. Griffits & J.M.H. Shaw, 2007
- Genus Kinetochilus (Schlechter) F.G. Brieger in F.G. Brieger et al., 1981 accepted as Dendrobium O. Swartz, 1799
- Genus Kingidium P.F. Hunt, 1970 accepted as Phalaenopsis Blume, 1825
- Genus Kingiella Rolfe, 1917 accepted as Phalaenopsis Blume, 1825
- Genus Kionophyton L.A. Garay, 1982
- Genus Kipandiorchis P. O'Byrne & L. Gokusing, 2015
- Genus Kippenara Hort., 1998
- Genus Kirchara Hort., 1959
- Genus Kitigorchis Maekawa, 1971
- Genus Klehmara Hort., 1990
- Genus Klugara J.M.H. Shaw, 2011
- Genus Knappara Hort., 1986
- Genus Knowlesara J.M.H. Shaw, 2011
- Genus Knudsenara J.M.H. Shaw, 2009
- Genus Knudsonara Hort., 1981
- Genus Kochiophyton Schlechter ex Cogniaux in C.F.P. Martius, 1906 accepted as Aganisia J. Lindley, 1839
- Genus Kodamaara J.M.H. Shaw, 2017
- Genus Koellenaea F. Deusvando de Vascondelos Leitão & J.M.H. Shaw, 2024
- Genus Koellensteinia H.G. Reichenbach, 1854
- Genus Komarovara J.M.H. Shaw, 2011
- Genus Komkrisara Hort., 1974
- Genus Konantzia C.H. Dodson & N. Williams, 1980
- Genus Kornasia D.L. Szlachetko, 1995
- Genus Kraenzlinara L.A. Garay & H.R. Sweet, 1966
- Genus Kraenzlinella O. Kuntze in Post & O. Kuntze, 1903 accepted as Pleurothallis R. Brown in W.T. Aiton, 1813
- Genus Kraussara Hort., 1983
- Genus Kreodanthus L.A. Garay, 1977
- Genus Kriegerara Hort., 1993
- Genus Krymara J.M.H. Shaw, 2022
- Genus Kryptostoma (V.S. Summerhayes) D. Geerinck, 1982 accepted as Habenaria Willdenow, 1805
- Genus Kuhlhasseltia J.J. Smith, 1910
- Genus Kuhnara J. Dunkelberger & J.M.H. Shaw, 2003
- Genus Kunoara J.M.H. Shaw, 2011
- Genus Kunthara J.M.H. Shaw, 2004
- Genus Kylicanthe P. Descourvières, T. Stévart & V. Droissart in Descourvières et al., 2018
- Genus Lacaena J. Lindley, 1843
- Genus Lachelinara J.M.H. Shaw, 2002
- Genus Lacroixia D.L. Szlachetko, 2003
- Genus Laechilis J.M.H. Shaw, 2008
- Genus Laecholaelia J.M.H. Shaw, 2018
- Genus Laegoa W.A. Rhodehamel & J.M.H. Shaw, 2002
- Genus Laelia J. Lindley, 1831
- Genus Laelianthe J.M.H. Shaw, 2003
- Genus Laelichilis R.P. Sauleda, 1988
- Genus Laelidendranthe J.M.H. Shaw, 2007
- Genus Laeliocatanthe J.M.H. Shaw, 2004
- Genus Laeliocatarthron J.M.H. Shaw, 2005
- Genus Laeliocatonia H.M. Wallbrunn, 1967
- Genus Laeliocattkeria Hort., 1965
- Genus Laeliocattleya Rolfe, 1887
- Genus Laelio-cattleya Rolfe, 1887 accepted as Laeliocattleya Rolfe, 1887
- Genus Laeliodendrum G. Mantin, 1897
- Genus Laeliokeria Hort., 1970
- Genus Laeliopleya Hort., 1966
- Genus Laeliopsis Lindley & Paxton, 1853 accepted as Broughtonia R. Brown in W.T. Aiton, 1813
- Genus Laelirhynchos J.M.H. Shaw, 2003 accepted as Laecholaelia J.M.H. Shaw, 2018
- Genus Laelonia Hort., 1957
- Genus Laeopsis W.W.G. Moir, 1957
- Genus Laerianchea H. Griffits & J.M.H. Shaw, 2007
- Genus Lagerara Hort., 1972
- Genus Laipenchihara Hort., 1997
- Genus Lairesseara J.M.H. Shaw, 2011
- Genus Lalexia C.A. Luer, 2011 accepted as Stelis O. Swartz, 1800
- Genus Lambara K. Emig & D. Emig, 2011
- Genus Lambeauara J.M.H. Shaw, 2008
- Genus Lancebirkara Hort., 1982
- Genus Lanium (Lindley) Bentham, 1881 accepted as Epidendrum Linnaeus, 1763
- Genus Lankesterella O. Ames, 1923
- Genus Lankesteriana A.P. Karremans, 2014 accepted as Anathallis Barbosa Rodrigues, 1877
- Genus Larnandra Rafinesque, 1825 accepted as Epidendrum Linnaeus, 1763
- Genus Lathrisia O. Swartz, 1829 accepted as Bartholina R. Brown in W.T. Aiton, 1813
- Genus Latourea G. Bentham & J.D. Hooker, 1883 accepted as Dendrobium O. Swartz, 1799
- Genus Latouria Blume, 1849 accepted as Dendrobium O. Swartz, 1799
- Genus Latourorchis F.G. Brieger in F.G. Brieger et al., 1981 accepted as Dendrobium O. Swartz, 1799
- Genus Lauara Hort., 1982
- Genus Lavrihara J.M.H. Shaw, 2002
- Genus Lawlessara J.M.H. Shaw, 2004 accepted as Lawlessara J.M.H. Shaw, 2005
- Genus Lawlessara J.M.H. Shaw, 2005
- Genus Lawrenceara J.M.H. Shaw, 2007
- Genus Law-schofieldara H. Griffits & J.M.H. Shaw, 2007
- Genus Laycockara Hort., 1966
- Genus Leaneyara
- Genus Leaoa Schlechter & C. Porto, 1922 accepted as Scaphyglottis Poeppig & Endlicher, 1836
- Genus Lebaudyara H. Griffits & J.M.H. Shaw, 2007
- Genus Lecanorchis Blume, 1856
- Genus Lectandra J.J. Smith, 1907 accepted as Poaephyllum H.N. Ridley, 1907
- Genus Ledgeria F. von Mueller, 1859 accepted as Galeola Loureiro, 1790
- Genus Ledienara J.M.H. Shaw, 2009
- Genus Leeara Hort., 1972
- Genus Leemannara H. Griffits & J.M.H. Shaw, 2007
- Genus Leioanthum M.A. Clements & D.L. Jones, 2002 accepted as Dendrobium O. Swartz, 1799
- Genus Lemaireara Hort., 1979
- Genus Lemboglossum F. Halbinger, 1984
- Genus Lemurangis (Garay) D.L. Szlachetko, J. Mytnik-Ejsmont & E. Grochocka, 2013 accepted as Angraecum Bory de St.-Vincent, 1804
- Genus Lemuranthe Schlechter, 1924 accepted as Cynorkis Du Petit-Thouars, 1809
- Genus Lemurella Schlechter, 1925
- Genus Lemurorchis Kraenzlin, 1893
- Genus Leochilumnia J.M.H. Shaw, 2004 accepted as Leochilumnia J.M.H. Shaw, 2005
- Genus Leochilumnia J.M.H. Shaw, 2005
- Genus Leochilus Knowles & Westcott, 1838
- Genus Leocidium Hort., 1972
- Genus Leocidmesa Hort., 1984
- Genus Leocidpasia Hort., 1990
- Genus Leocidumnia J.M.H. Shaw, 2004 accepted as Leocidumnia J.M.H. Shaw, 2005
- Genus Leocidumnia J.M.H. Shaw, 2005
- Genus Leogolumnia J.M.H. Shaw, 2004 accepted as Leogolumnia J.M.H. Shaw, 2005
- Genus Leogolumnia J.M.H. Shaw, 2005
- Genus Leokoa J.M.H. Shaw, 2004
- Genus Leomesezia J.M.H. Shaw, 2011
- Genus Leonara J.M.H. Shaw, 2007
- Genus Leopardanthus Blume, 1849 accepted as Dipodium R. Brown, 1810
- Genus Lepanopsis Hort., 1993
- Genus Lepanthes O. Swartz, 1799
- Genus Lepanthopsis (Cogniaux) Ames, 1933
- Genus Lepervenchea E. Jacob de Cordemoy, 1899 accepted as Angraecum Bory de St.-Vincent, 1804
- Genus Lepidogyne Blume, 1859
- Genus Leporella A.S. George, 1971
- Genus Leptocentrum Schlechter, 1914 accepted as Rangaeris (Schlechter) Summerhayes, 1936
- Genus Leptoceras (R. Brown) J. Lindley, 1840
- Genus Leptoceras R.D. Fitzgerald, 1891
- Genus Leptodendrum Hort., 1987
- Genus Leptogastrodia M.A. Clements & D.L. Jones, 2019
- Genus Leptoguarianthe J.M.H. Shaw, 2003
- Genus Leptokeria Hort., 1992
- Genus Leptolaelia Hort., 1902
- Genus Leptorchis L.M.A. du P. Thouars ex C.E.O. Kuntze, 1891 accepted as Liparis L.C. Richard, 1817
- Genus Leptorkis L.M.A.A. Du Petit-Thouars, 1809 accepted as Liparis L.C. Richard, 1817
- Genus Leptosophrocattleya J.M.H. Shaw, 2007
- Genus Leptotes J. Lindley, 1833
- Genus Leptovola Hort., 1980
- Genus Leptovolanthe J. Rumrill, 2021
- Genus Lequeetia Bubani, 1901 accepted as Limodorum Boehmer in C.G. Ludwig, 1760
- Genus Lesliea G. Seidenfaden, 1988
- Genus Leslieara Hort., 1984
- Genus Lesliegraecum D.L. Szlachetko, J. Mytnik-Ejsmont & E. Grochocka, 2013 accepted as Angraecum Bory de St.-Vincent, 1804
- Genus Lesliehertensteinara J.M.H. Shaw, 2011
- Genus Lesueurara H. Griffits & J.M.H. Shaw, 2007
- Genus Letochilum J.M.H. Shaw, 2009
- Genus Leucadenia Schlechter, 1919
- Genus Leucerminium R. Mansfeld, 1936
- Genus Leucohyle Klotzsch, 1855
- Genus Leucolaena Ridley accepted as Leucolena Ridley, 1891
- Genus Leucolena Ridley, 1891 accepted as Didymoplexiella L.A. Garay, 1954
- Genus Leucorchis Blume, 1849 accepted as Didymoplexis W. Griffith, 1843
- Genus Leucorchis E.H.F. Meyer, 1839 accepted as Pseudorchis Séguier, 1754
- Genus Leucororchis Ciferri & Giacomini, 1950
- Genus Leucostachys Hoffmannsegg, 1842 accepted as Goodyera R. Brown in W.T. Aiton, 1813
- Genus Leucotella Schlechter, 1919
- Genus Lewisara Hort., 1968
- Genus Liaopsis Hort., 1959
- Genus Lichenora R. Wight, 1851
- Genus Lichinora R. Wight, 1851 accepted as Porpax J. Lindley, 1845
- Genus Lichtara Hort., 1986
- Genus Liebmanara Hort., 1983
- Genus Ligeophila L.A. Garay, 1977
- Genus Limara Hort., 1960
- Genus Limatodes J. Lindley, 1833 accepted as Calanthe R. Brown, 1821
- Genus Limatodis Blume, 1825 accepted as Calanthe R. Brown, 1821
- Genus Limnas J.F. Ehrhart ex H.D. House, 1920
- Genus Limnorchis Rydberg, 1900 accepted as Platanthera L.C. Richard, 1817
- Genus Limodorum Boehmer in C.G. Ludwig, 1760
- Genus Limodorum Linnaeus, 1753
- Genus Linara C.C. Tsai, 2012
- Genus Lindblomia E.M. Fries, 1843 accepted as Dactylorhiza Necker ex Nevski, 1937
- Genus Lindleyara L.A. Garay & H.R. Sweet, 1966
- Genus Lindleyella Schlechter, 1914 accepted as Rudolfiella Hoehne, 1944
- Genus Lindsayella O. Ames & C. Schweinfurth, 1937 accepted as Sobralia Ruiz & Pavon, 1794
- Genus Linguella D.L. Jones & M.A. Clements, 2002 accepted as Pterostylis R. Brown, 1810
- Genus Lioponia Hort., 1959
- Genus Liparis L.C. Richard, 1817
- Genus Lisowskia D.L. Szlachetko, 1995
- Genus Lissochilus R. Brown, 1821 accepted as Eulophia R. Brown, 1821
- Genus Listera R. Brown in W.T. Aiton, 1813
- Genus Listeria K.P.J. Sprengel, 1817 accepted as Listera R. Brown in W.T. Aiton, 1813
- Genus Listrostachys H.G. Reichenbach, 1852
- Genus Liuguishania Z.J. Liu & J.N. Zhang, 1998 accepted as Cymbidium O. Swartz, 1799
- Genus Lobbara J.M.H. Shaw, 2011
- Genus Lobogyne Schlechter, 1900 accepted as Appendicula Blume, 1825
- Genus Lockcidium Hort., 1982
- Genus Lockcidmesa Hort., 1994
- Genus Lockhartia W.J. Hooker, 1827
- Genus Lockhartiopsis F. Archila, 1999 accepted as Lockhartia W.J. Hooker, 1827
- Genus Lockia L.V. Averyanov, 2012
- Genus Lockochilettia Hort., 1989
- Genus Lockochilus Hort., 1977
- Genus Lockoglossum J.M.H. Shaw, 2005
- Genus Lockoglossum J.M.H. Shaw, 2004 accepted as Lockoglossum J.M.H. Shaw, 2005
- Genus Lockogochilus Hort., 1990
- Genus Lockopilia Hort., 1992
- Genus Lockostalix Hort., 1987
- Genus Loefgrenianthus Hoehne, 1927
- Genus Lomantrisuloara J.M.H. Shaw, 2008
- Genus Lonchitis Bubani, 1901 accepted as Serapias Linnaeus, 1753
- Genus Londesboroughara J.M.H. Shaw, 2008
- Genus Longhueiara A. Chen, 2017
- Genus Longwellara J.M.H. Shaw, 2018
- Genus Lophiarella D.L. Szlachetko, J. Mytnik-Ejsmont & A. Romowicz, 2006 accepted as Trichocentrum Poeppig & Endlicher, 1836
- Genus Lophiaris Rafinesque, 1838 accepted as Oncidium O. Swartz, 1800
- Genus Lophoglotis Rafinesque, 1838 accepted as Sophronitis J. Lindley, 1828
- Genus Lophoglottis Rafinesque accepted as Lophoglotis Rafinesque, 1838
- Genus Lorenara L. Batchman, 2007
- Genus Loroglorchis E.G. Camus, 1892 accepted as Lorogl-Orchis E.G. Camus, 1892
- Genus Lorogl-Orchis E.G. Camus, 1892
- Genus Loroglossum L.C. Richard, 1817 accepted as Himantoglossum K.P.J. Sprengel, 1826
- Genus Lothiania Kraenzlin, 1924 accepted as Porroglossum Schlechter, 1920
- Genus Lothoniana Kraenzlin accepted as Lothiania Kraenzlin, 1924
- Genus Louiscappeara J.M.H. Shaw, 2009
- Genus Lovelessara J.M.H. Shaw, 2008
- Genus Lowara Hort., 1912
- Genus Lowianthus O. Beccari, 1902 accepted as Dimorphorchis Rolfe, 1919
- Genus Lowiorchis D.L. Szlachetko, 2004
- Genus Lowsonara Hort., 1977
- Genus Lowsutongara J.M.H. Shaw, 2003
- Genus Loxoma Garay, 1972 accepted as Smithsonia C.J. Saldanha, 1974
- Genus Loxomorchis S. Rauschert, 1982 accepted as Smithsonia C.J. Saldanha, 1974
- Genus Luascotia Hort., 1974
- Genus Lucasara J.M.H. Shaw, 2008
- Genus Ludisia A. Richard in Bory de St.-Vincent, 1825
- Genus Ludlowara J.M.H. Shaw, 2011
- Genus Ludochilus L.A. Garay & H.R. Sweet, 1966
- Genus Lueckelia R. Jenny, 1999
- Genus Lueddemannia J. Linden & H.G. Reichenbach in H.G. Reichenbach, 1854
- Genus Luedletia J.M.H. Shaw, 2018
- Genus Luerella L.A. Braas, 1979 accepted as Masdevallia Ruiz & Pavon, 1794
- Genus Luianopsanthe J.M.H. Shaw, 2013
- Genus Luicentrum Hort., 1983
- Genus Luichilus Hort., 1982
- Genus Luilionanda J.M.H. Shaw, 2013
- Genus Luinetia Hort., 1976
- Genus Luinopsanda J.M.H. Shaw, 2013
- Genus Luinopsis Hort., 1974
- Genus Luiparananthera H.C. Pritchard, 2023
- Genus Luiphalandopsis J.M.H. Shaw, 2013
- Genus Luisanda Hort. ex C.H. Curtis, 1952
- Genus Luisanthera G.M. Pradhan, 2011
- Genus Luisedda J.M.H. Shaw, 2004
- Genus Luiserides F. Maekawa, 1971
- Genus Luisia Gaudichaud-Beaupré in Freycinet, 1829
- Genus Luisiopsis C.S. Kumar & P.C.S. Kumar, 2005
- Genus Luistylis Hort., 1986
- Genus Luivanetia Hort., 1977
- Genus Lutherara Hort., 1973
- Genus Lycabstia J.M.H. Shaw, 2003
- Genus Lycafrenuloa J.M.H. Shaw, 2013
- Genus Lycamerlycaste J.M.H. Shaw, 2009
- Genus Lycanisia D. Morris, 2010
- Genus Lycaste Lindley, 1843
- Genus Lycastenaria J. Colman, 1933
- Genus Lycasteria Hort., 1954 accepted as Lycastenaria J. Colman, 1933
- Genus Lycastiella J.M.H. Shaw, 2008
- Genus Lycazella J.M.H. Shaw, 2010
- Genus Lycida H.F. Oakeley, 2003
- Genus Lycobyana F. Archila & G.R. Chiron, 2010 accepted as Lycaste Lindley, 1843
- Genus Lycomormium H.G. Reichenbach, 1852
- Genus Lyfrenaria Hort., 1954 accepted as Lycastenaria J. Colman, 1933
- Genus Lymanara Hort., 1967
- Genus Lyonara Hort., 1959
- Genus Lyperanthus R. Brown, 1810
- Genus Lyraea J. Lindley, 1830 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Lyridium J.M.H. Shaw, 2008
- Genus Lyrochilus D.L. Szlachetko, 2008 accepted as Pteroglossa Schlechter, 1920
- Genus Lyroglossa Schlechter, 1920
- Genus Lysias Salisbury ex Rydberg, 1900 accepted as Platanthera L.C. Richard, 1817
- Genus Lysiella Rydberg, 1900 accepted as Platanthera L.C. Richard, 1817
- Genus Lysimnia Rafinesque, 1838 accepted as Brassavola R. Brown in W.T. Aiton, 1813
- Genus Lysudamuloa J.M.H. Shaw, 2009
- Genus Macbrideara J.M.H. Shaw, 2011
- Genus Maccorquodaleara Ross Tucker, 2005
- Genus Maccoyara Hort., 1972
- Genus Maccraithara C. Halls & J.M.H. Shaw, 2001
- Genus Maccraithea M.A. Clements & D.L. Jones, 2002 accepted as Dendrobium O. Swartz, 1799
- Genus Maccullyara J. McCully, 2009
- Genus Macdanielara J.M.H. Shaw, 2012
- Genus Macdonaldia J. Lindley, 1840 accepted as Thelymitra J.R. Forster & J.G.A. Forster, 1775
- Genus Macekara Hort., 1991
- Genus Maclellanara Hort., 1978
- Genus Maclemoreara Hort., 1979
- Genus Macmeekinara J.M.H. Shaw, 2008
- Genus Macodes (Blume) J. Lindley, 1840
- Genus Macodisia L.A. Garay & H.R. Sweet, 1966
- Genus Macomaria R.A. Rolfe, 1887
- Genus Macradenia R. Brown, 1822
- Genus Macradesa Hort., 1968
- Genus Macrangraecum Hortus in Costantin, 1917
- Genus Macrastonia J.M.H. Shaw, 2012
- Genus Macrocentrum R.A. Philippi, 1870 accepted as Habenaria Willdenow, 1805
- Genus Macrochilus Knowles & Westcott, 1837 accepted as Miltonia J. Lindley, 1837
- Genus Macroclinium Barbosa Rodrigues, 1882
- Genus Macrolepis A. Richard in Dumont d'Urville, 1834 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Macroplectrum Pfitzer in Engler & Prantl, 1889 accepted as Angraecum Bory de St.-Vincent, 1804
- Genus Macropodanthus L.O. Williams, 1938
- Genus Macropodsiella T.W. Yu, 2019
- Genus Macrostomium Blume, 1825 accepted as Dendrobium O. Swartz, 1799
- Genus Macrostylis Breda, 1828 accepted as Corymborkis Du Petit-Thouars, 1809
- Genus Maechtleara G. Monnier & J.M.H. Shaw, 2004
- Genus Maelenia Dumortier, 1834 accepted as Cattleya J. Lindley, 1821 (?)
- Genus Mailamaiara Hort., 1986
- Genus Malachadenia Lindley, 1839 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Malaxis Solander ex O. Swartz, 1788
- Genus Malcolmcampbellara Hort., 1997
- Genus Malleola J.J. Smith & Schlechter in Schlechter, 1913
- Genus Manniella H.G. Reichenbach, 1881
- Genus Mantinara J.M.H. Shaw, 2007
- Genus Mapinguari G. Carnevali & R.B. Singer, 2007
- Genus Mapingucaste J.M.H. Shaw, 2008
- Genus Marcchristopherstormara P.A. Storm & J.M.H. Shaw, 2015
- Genus Margelliantha P.J. Cribb, 1979
- Genus Mariarisqueta Guinea López, 1946 accepted as Cheirostylis Blume, 1825
- Genus Marimeara P.E. Esperon, 2011
- Genus Markara J.M.H. Shaw, 2017
- Genus Maronara J.M.H. Shaw, 2007
- Genus Marriottara J.M.H. Shaw, 2007
- Genus Marshara J.M.H. Shaw, 2009
- Genus Marsupiaria Hoehne, 1947 accepted as Heterotaxis J. Lindley, 1826
- Genus Martiusara J.M.H. Shaw, 2004 accepted as Martiusara J.M.H. Shaw, 2005
- Genus Martiusara J.M.H. Shaw, 2005
- Genus Marvingerberara M. Gerber & R. Gerber, 2005
- Genus Marycrawleystormara P.A. Storm & J.M.H. Shaw, 2015
- Genus Marystormara J.M.H. Shaw & P.A. Storm, 2018
- Genus Masdevalia Ruiz & Pavon, 1794
- Genus Masdevallia Ruiz & Pavon, 1794
- Genus Masrepia J.M.H. Shaw, 2013
- Genus Massangeara J.M.H. Shaw, 2011
- Genus Mastigion L.A. Garay, F. Hamer & E.S. Siegerist, 1994
- Genus Matalbatzia F. Archila, 1999 accepted as Oncidium O. Swartz, 1800
- Genus Mathewsara J.M.H. Shaw, 2011
- Genus Matsudaara Hort., 1991
- Genus Maturna Rafinesque, 1837 accepted as Gomesa R. Brown in J. Sims, 1815
- Genus Maumeneara J.M.H. Shaw, 2009
- Genus Maunderara Hort., 1995
- Genus Mauriceara J.M.H. Shaw, 2003
- Genus Maxcastuloa J.M.H. Shaw, 2023
- Genus Maxidium J.M.H. Shaw, 2005
- Genus Maxillacaste Hort., 1974
- Genus Maxillaria Ruiz & Pavon, 1794
- Genus Maxillariella M.A. Blanco & G. Carnevali, 2007
- Genus Maxillyca J.M.H. Shaw, 2010
- Genus Maxilobium Hort., 1992
- Genus Maxiluloa U.B. Deshmukh & J.M.H. Shaw, 2021
- Genus Maxthompsonara F.W. Clarke, 2016
- Genus Mayara L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Maymoirara Hort., 1984
- Genus Meadara Z.-H. Feng & J.M.H. Shaw, 2022
- Genus Measuresara J.M.H. Shaw, 2007
- Genus Meciclis Rafinesque accepted as Meliclis Rafinesque, 1837
- Genus Mecopodum D.L. Jones & M.A. Clements, 2004 accepted as Prasophyllum R. Brown, 1810
- Genus Mecosa Blume, 1825 accepted as Platanthera L.C. Richard, 1817
- Genus Mediocalcar J.J. Smith, 1900
- Genus Meechaiara Hort., 1996
- Genus Megaclinium J. Lindley, 1826 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Megalorchis H. Perrier de la Bâthie, 1937
- Genus Megalotus Garay, 1972
- Genus Megastylis (Schlechter) Schlechter, 1911
- Genus Meiracyllium H.G. Reichenbach, 1854
- Genus Meirmosesara J.M.H. Shaw, 2002
- Genus Meliclis Rafinesque, 1837 accepted as Coryanthes W.J. Hooker, 1831
- Genus Meloara J.M.H. Shaw, 2009
- Genus Menadena Rafinesque, 1837 accepted as Maxillaria Ruiz & Pavon, 1794
- Genus Menadenium Rafinesque ex Cogniaux in C.F.P. Martius, 1902 accepted as Zygosepalum H.G. Reichenbach, 1859
- Genus Mendelara J.F. Jusczak & J.M.H. Shaw, 2004
- Genus Mendoncella A.D. Hawkes, 1964 accepted as Galeottia A. Richard & H.G. Galeotti, 1845
- Genus Mendosepalum Hort., 1991
- Genus Menephora Rafinesque, 1838 accepted as Paphiopedilum Pfitzer, 1886
- Genus Mengzia W.-C. Huang, Z.-J. Liu & C. Hu, 2021
- Genus Menziesara J.M.H. Shaw, 2002
- Genus Mesadenella Pabst & Garay, 1953
- Genus Mesadenus Schlechter, 1920
- Genus Mesicera Rafinesque, 1825
- Genus Mesoclastes J. Lindley, 1830 accepted as Luisia Gaudichaud-Beaupré in Freycinet, 1829
- Genus Mesodactylis N. Wallich, 1830 accepted as Apostasia Blume, 1825
- Genus Mesoglossum F. Halbinger, 1982
- Genus Mesoptera Rafinesque, 1833 accepted as Liparis L.C. Richard, 1817
- Genus Mesospinidium H.G. Reichenbach, 1852
- Genus Metachilum J. Lindley, 1830 accepted as Appendicula Blume, 1825
- Genus Metdepenningenara J.M.H. Shaw, 2008
- Genus Mexicoa L.A. Garay in L.A. Garay & J.E. Stacy, 1974
- Genus Mexipedium V.A. Albert & M.W. Chase, 1992
- Genus Michaelara M. Tibbs, 2018
- Genus Michaeltibbsara J.M.H. Shaw, 2018
- Genus Michelvacherotara J.M.H. Shaw, 2007
- Genus Micholitzara Hort., 1983
- Genus Microchilus K.B. Presl, 1827
- Genus Microcoelia J. Lindley, 1830
- Genus Microepidendrum F.G. Brieger ex W.E. Higgins, 2002 accepted as Epidendrum Linnaeus, 1763
- Genus Microholmesia P.J. Cribb ex D.J. Mabberley, 1987 accepted as Angraecopsis Kraenzlin, 1900
- Genus Micropera Lindley, 1832
- Genus Microphytanthe (Schlechter) F.G. Brieger in F.G. Brieger et al., 1981 accepted as Dendrobium O. Swartz, 1799
- Genus Microsaccus Blume, 1825
- Genus Microstylis (Nuttall) A. Eaton, 1822 accepted as Malaxis Solander ex O. Swartz, 1788
- Genus Microstylus (Nuttall) A. Eaton, 1822
- Genus Microtatorchis Schlechter in K.M. Schumann & Lauterbach, 1905
- Genus Microterangis (Schlechter) K. Senghas, 1985
- Genus Microtheca Schlechter, 1925 accepted as Cynorkis Du Petit-Thouars, 1809
- Genus Microthelys L.A. Garay, 1982
- Genus Microtidium D.L. Jones & M.A. Clements in D.L. Jones, M.A. Clements, I.K. Sharma & A.M. Mackenzie, 2002 accepted as Microtis R. Brown, 1810
- Genus Microtis R. Brown, 1810
- Genus Miguelia L.V. Averyanov, 2011 accepted as Vanilla P. Miller, 1754
- Genus Milassentrum J.M.H. Shaw, 2004
- Genus Milcentrum J.M.H. Shaw, 2004
- Genus Milenkocidium J.M.H. Shaw, 2004
- Genus Millerara J.M.H. Shaw, 2008
- Genus Milmilcidium J.M.H. Shaw, 2004 accepted as Milmilcidium J.M.H. Shaw, 2005
- Genus Milmilcidium J.M.H. Shaw, 2005
- Genus Milmilodia J.M.H. Shaw, 2004
- Genus Milmiloglossum J.M.H. Shaw, 2004 accepted as Milmiloglossum J.M.H. Shaw, 2005
- Genus Milmiloglossum J.M.H. Shaw, 2005
- Genus Milmilrassia J.M.H. Shaw, 2013
- Genus Milmiltonia J.M.H. Shaw, 2004
- Genus Milonzina J.M.H. Shaw, 2005
- Genus Milonzina J.M.H. Shaw, 2004 accepted as Milonzina J.M.H. Shaw, 2005
- Genus Milpasia Hort., 1959
- Genus Milpilia Hort., 1961
- Genus Miltada Hort., 1980
- Genus Miltadium Hort., 1982
- Genus Miltarettia Hort., 1994
- Genus Miltassia Hort., 1958 accepted as Bratonia W.W.G. Moir, 1957
- Genus Miltistonia Hort., 1991
- Genus Miltochilidium J.M.H. Shaw, 2009
- Genus Miltochilum J.M.H. Shaw, 2011
- Genus Miltodontrum J.M.H. Shaw, 2004
- Genus Miltoglossum Hort., 1910 accepted as Odontonia Rolfe, 1905
- Genus Miltogomechilum J.M.H. Shaw, 2011
- Genus Miltoncentrum J.M.H. Shaw, 2004
- Genus Miltoncidostele J.M.H. Shaw, 2011
- Genus Miltonguezia W.W.G. Moir, 1957
- Genus Miltonia J. Lindley, 1837
- Genus Miltonidium Hort., 1936
- Genus Miltonioda Hort., 1909
- Genus Miltonioides F.G. Brieger & E. Lückel, 1983 accepted as Oncidium O. Swartz, 1800
- Genus Miltoniopsis A. Godefroy-Lebeuf, 1889
- Genus Miltonpasia W.W.G. Moir, 1957
- Genus Miltonpilia W.W.G. Moir, 1957
- Genus Miltostelada J.M.H. Shaw, 2010
- Genus Minicolumna F.G. Brieger in F.G. Brieger et al., 1976 accepted as Epidendrum Linnaeus, 1763
- Genus Minuscula D.L. Szlachetko & M. Kolanowska, 2022
- Genus Mirandorchis D.L. Szlachetko & M. Kras-Lapinska, 2003
- Genus Mischobulbon Schlechter accepted as Mischobulbum Schlechter, 1911
- Genus Mischobulbum Schlechter, 1911
- Genus Mitopetalum Blume, 1828 accepted as Tainia Blume, 1825
- Genus Mitostigma Blume, 1856 accepted as Amitostigma Schlechter, 1919
- Genus Mizunoara J.M.H. Shaw, 2005
- Genus Mizutara Hort., 1996
- Genus Mobilabium Rupp, 1946
- Genus Moensara H. Griffits & J.M.H. Shaw, 2007
- Genus Moerenhoutia Blume, 1858(?) accepted as Platylepis A. Richard, 1828
- Genus Moirara Hort., 1963
- Genus Mokara Hort., 1969
- Genus Molloybas D.L. Jones & M.A. Clements in D.L. Jones, M.A. Clements, I.K. Sharma & A.M. Mackenzie, 2002 accepted as Corybas R.A. Salisbury, 1807
- Genus Momordia G.C. Kennedy, 1978
- Genus Monachanthus J. Lindley, 1832 accepted as Catasetum L.C. Richard ex Kunth, 1822
- Genus Monadenia J. Lindley, 1835 accepted as Disa P.J. Bergius, 1767
- Genus Monanthochilus (F.R.R. Schlechter) R. Rice, 2004
- Genus Monanthos (F.R.R. Schlechter) F.G. Brieger, 1981 accepted as Dendrobium O. Swartz, 1799
- Genus Monanthus F.G. Brieger in F.G. Brieger et al., 1981
- Genus Monixus Finet, 1907 accepted as Angraecum Bory de St.-Vincent, 1804
- Genus Monkara B. Monk, 2011
- Genus Monnierara Hort., 1990
- Genus Monochilus Wallich ex J. Lindley, 1840 accepted as Zeuxine Lindley, 1826
- Genus Monomeria J. Lindley, 1830
- Genus Monophyllorchis Schlechter, 1920
- Genus Monorchis Séguier, 1754
- Genus Monorchis G. Agosti, 1770 accepted as Herminium Linnaeus, 1758
- Genus Monorchis J.F. Ehrhart, 1789
- Genus Monosepalum Schlechter, 1912
- Genus Monotris J. Lindley, 1834 accepted as Holothrix L.C. Richard ex J. Lindley, 1835
- Genus Montolivaea H.G. Reichenbach, 1881 accepted as Habenaria Willdenow, 1805
- Genus Monustes Rafinesque, 1837 accepted as Spiranthes L.C. Richard, 1817
- Genus Moonara Hort., 1982
- Genus Moorea Rolfe, 1890 accepted as Neomoorea Rolfe, 1904
- Genus Mooreara Hort., 1998
- Genus Morieara T. Morie & J.M.H. Shaw, 2002
- Genus Mormariella J.M.H. Shaw, 2011
- Genus Mormodes J. Lindley, 1836
- Genus Mormolyca Fenzl, 1850
- Genus Morrisonara Hort., 1993
- Genus Moscosoara W.W.G. Moir, 1969
- Genus Mountfordara J.M.H. Shaw, 2005
- Genus Mountfordara J.M.H. Shaw, 2004 accepted as Mountfordara J.M.H. Shaw, 2005
- Genus Muluorchis J.J. Wood, 1984 accepted as Tropidia J. Lindley, 1833
- Genus Muscarella C.A. Luer, 2006
- Genus Myanthus J. Lindley, 1832 accepted as Catasetum L.C. Richard ex Kunth, 1822
- Genus Mycaranthes Blume, 1825 accepted as Eria J. Lindley, 1825
- Genus Mycaridanthes Blume accepted as Eria J. Lindley, 1825
- Genus Myoda Lindley, 1833 accepted as Ludisia A. Richard in Bory de St.-Vincent, 1825
- Genus Myodium R.A. Salisbury, 1812 accepted as Ophrys Linnaeus, 1753
- Genus Myoxanthus Poeppig & Endlicher, 1836
- Genus Myoxastrepia L. Glicenstein & J.M.H. Shaw, 2003
- Genus Myrmecanthe J.M.H. Shaw, 2007
- Genus Myrmecatavola J.M.H. Shaw, 2009
- Genus Myrmecatyclia J.M.H. Shaw, 2018
- Genus Myrmecavola P.A. Storm, 2009
- Genus Myrmechila D.L. Jones & M.A. Clements, 2005 accepted as Chiloglottis R. Brown, 1810
- Genus Myrmechis (Lindley) Blume, 1858 (?)
- Genus Myrmecocattleya F.J. Hanbury, 1920
- Genus Myrmecochile J.M.H. Shaw, 2013
- Genus Myrmecolaelia F.J. Hanbury, 1920
- Genus Myrmecophila Rolfe, 1917
- Genus Myrmesophleya J.M.H. Shaw, 2007
- Genus Myrobroma R.A. Salisbury, 1807 accepted as Vanilla P. Miller, 1754
- Genus Myrosmodes H.G. Reichenbach, 1854
- Genus Mystacidium Lindley in W.J. Hooker, 1837
- Genus Mystorchis J.T. Truter & J.M.H. Shaw, 2009
- Genus Nabaluia O. Ames, 1920 accepted as Coelogyne J. Lindley, 1821?
- Genus Nageliella L.O. Williams, 1940
- Genus Nakagawaara Hort., 1980
- Genus Nakamotoara L.A. Garay, 1972
- Genus Nakamotoara Hort., 1964
- Genus Nakamuraara T.T. Nakamura, 2011
- Genus Nanodes Lindley, 1832 accepted as Epidendrum Linnaeus, 1763
- Genus Narica Rafinesque, 1837 accepted as Sarcoglottis K.B. Presl, 1827
- Genus Nashara Hort., 1974
- Genus Nasonia Lindley in Bentham, 1844 accepted as Fernandezia Ruiz & Pavon, 1794
- Genus Nathanrobertsara J. Roberts, 2022
- Genus Nauenia Klotzsch, 1853 accepted as Lacaena J. Lindley, 1843
- Genus Naugleara Hort., 1985
- Genus Nealeara J.M.H. Shaw, 2023
- Genus Neippergia C. Morren, 1849 accepted as Acineta J. Lindley, 1843
- Genus Nemacianthus D.L. Jones & M.A. Clements in D.L. Jones, M.A. Clements, I.K. Sharma & A.M. Mackenzie, 2002 accepted as Acianthus R. Brown, 1810
- Genus Nemaconia Knowles & Westcott, 1838 accepted as Ponera Lindley, 1831
- Genus Nematoceras J.D. Hooker, 1853 accepted as Corybas R.A. Salisbury, 1807
- Genus Nemuranthes Rafinesque, 1837 accepted as Habenaria Willdenow, 1805
- Genus Neoaeristylis Hort., 1998
- Genus Neobartlettia Schlechter, 1920 accepted as Palmorchis Barbosa Rodrigues, 1877
- Genus Neobathiea R. Schlechter, 1925
- Genus Neobatopus Hort., 1985
- Genus Neobennettia K. Senghas, 2001
- Genus Neobenthamia Rolfe, 1891
- Genus Neobolusia Schlechter, 1895
- Genus Neoburttia J. Mytnik-Ejsmont, D.L. Szlachetko & P. Baranow, 2011 accepted as Polystachya W.J. Hooker, 1824
- Genus Neocaste W. Jasen & J.M.H. Shaw, 2020
- Genus Neoclemensia C.E. Carr, 1935
- Genus Neocogniauxia Schlechter in Urban, 1913
- Genus Neocribbia D.L. Szlachetko, 2003
- Genus Neodevereuxara L.A. Garay & H.R. Sweet, 1974
- Genus Neodryas H.G. Reichenbach, 1852
- Genus Neoescobaria Garay, 1972 accepted as Helcia J. Lindley, 1845
- Genus Neofadanda J.M.H. Shaw, 2004
- Genus Neofadenia J.M.H. Shaw, 2003
- Genus Neofinetia H.H. Hu, 1925
- Genus Neogardneria R. Schlechter ex Garay, 1973
- Genus Neoglossum Hort., 1989
- Genus Neograecum Hort., 1990
- Genus Neogyna H.G. Reichenbach, 1852 accepted as Coelogyne J. Lindley, 1821?
- Genus Neogyne H.G. Reichenbach accepted as Neogyna H.G. Reichenbach, 1852
- Genus Neokoehleria R. Schlechter, 1912 accepted as Scelochilus Klotzsch, 1841
- Genus Neolauchea Kraenzlin, 1897 accepted as Isabelia Barbosa Rodrigues, 1877
- Genus Neolehmannia Kraenzlin, 1899 accepted as Epidendrum Linnaeus, 1763
- Genus Neolindleya Kraenzlin, 1899
- Genus Neomoorea Rolfe, 1904
- Genus Neooreophilus F. Archila, 2009 accepted as Andinia (C.A. Luer) C.A. Luer, 2000
- Genus Neopabstopetalum J.M.H. Shaw, 2003
- Genus Neosedanda J.M.H. Shaw, 2004
- Genus Neosedirea J.M.H. Shaw, 2003
- Genus Neostylis Hort., 1965
- Genus Neostylopsis J.M.H. Shaw, 2003
- Genus Neotainiopsis S.S.R. Bennet & M.B. Raizada in M.B. Raizada & S.S.R. Bennet, 1981 accepted as Eriodes Rolfe, 1915
- Genus Neotiaceras R. Kohlmüller, 1988
- Genus Neotinea H.G. Reichenbach, 1852
- Genus Neotinorchis B. Bock, 2012 accepted as Orchinea J.M.H. Shaw, 2003
- Genus Neottia Guettard, 1754
- Genus Neottianthe (H.G.L. Reichenbach) Schlechter, 1919
- Genus Neottidium D.F.L. Schlechtendal, 1823 accepted as Neottia Guettard, 1754
- Genus Neourbania Fawcett & Rendle, 1909 accepted as Neo-urbania Fawcett & Rendle, 1909
- Genus Neo-urbania Fawcett & Rendle, 1909 accepted as Ornithidium R. Brown in W.T. Aiton, 1813
- Genus Neowilliamsia L.A. Garay, 1977 accepted as Epidendrum Linnaeus, 1763
- Genus Neowolffia O. Gruss, 2007 accepted as Podangis Schlechter, 1918
- Genus Neozygisia J.M.H. Shaw, 2015
- Genus Nephelaphyllum Blume, 1825
- Genus Nephrangis (Schlechter) Summerhayes, 1948
- Genus Nephranthera Hasskarl, 1842 accepted as Renanthera Loureiro, 1790
- Genus Nerissa Rafinesque, 1837 accepted as Ponthieva R. Brown in W.T. Aiton, 1813
- Genus Nervilia Commerson ex Gaudichaud-Beaupré in Freycinet, 1829
- Genus Neuwiedia Blume, 1833
- Genus Newenhamara M. Tibbs, 2020
- Genus Newzealochilus R. Rice, 2019 accepted as Drymoanthus W.H. Nicholls, 1943
- Genus Ngara Hort., 1978
- Genus Nicholasara J.M.H. Shaw, 2013
- Genus Nicholsonara J.M.H. Shaw, 2011
- Genus Nickcannazzaroara J.M.H. Shaw, 2012
- Genus Nideclia J.M.H. Shaw, 2008
- Genus Nidema N.L. Britton & Millspaugh, 1920
- Genus Nidus Rivinus, 1764 accepted as Neottia Guettard, 1754
- Genus Nidusavis Ortega, 1773 accepted as Nidus-avis Ortega, 1773
- Genus Nidus-avis Ortega, 1773
- Genus Niemeyera F. von Mueller, 1867
- Genus Nienokuea A.J.B. Chevalier, 1945 accepted as Polystachya W.J. Hooker, 1824
- Genus Nigribicchia E.G. Camus, Bergon & A. Camus in A. Camus & E.G. Camus, 1908
- Genus Nigritella L.C. Richard, 1817 accepted as Gymnadenia R. Brown in W.T. Aiton, 1813
- Genus Nigrorchis M.J. Godfery, 1925
- Genus Niphantha C.A. Luer, 2007 accepted as Stelis O. Swartz, 1800
- Genus Niphantha C.A. Luer, 2010 accepted as Stelis O. Swartz, 1800
- Genus Nipponorchis Masamune, 1934 accepted as Neofinetia H.H. Hu, 1925
- Genus Nitidobulbon I. Ojeda, G. Carnevali Fernández-Concha & G.A. Romero-González, 2009
- Genus Nitidocidium F. de Barros & V.T. Rodrigues, 2010 accepted as Gomesa R. Brown in J. Sims, 1815
- Genus Nobleara Hort., 1969
- Genus Nochacidiopsis J.M.H. Shaw, 2010
- Genus Nochocentrum J.M.H. Shaw, 2009
- Genus Nogomesa J.M.H. Shaw, 2009
- Genus Nohacidium J.M.H. Shaw, 2009
- Genus Nohagomenkoa J.M.H. Shaw, 2010
- Genus Nohalumnia J.M.H. Shaw, 2009
- Genus Nohamiltocidium J.M.H. Shaw, 2009
- Genus Nohamiltonia J.M.H. Shaw, 2009
- Genus Nohamiltoniopsis J.M.H. Shaw, 2009
- Genus Nohastelomesa J.M.H. Shaw, 2011
- Genus Nohawenkoa J.M.H. Shaw, 2009
- Genus Nohawilentrum J.M.H. Shaw, 2009
- Genus Nohawilliamsia M.W. Chase & M. Whitten, 2009, nom. inval. accepted as Nohawilliamsia M.W. Chase & M. Whitten, 2009
- Genus Nohawilliamsia M.W. Chase & M. Whitten, 2009
- Genus Nohazelencidium J.M.H. Shaw, 2010
- Genus Nonaara Hort., 1978
- Genus Norna Wahlenberg, 1826 accepted as Calypso R.A. Salisbury, 1807
- Genus Nornahamamotoara Hort., 1988
- Genus Northenara Hort., 1974
- Genus Norwoodara Hort., 1982
- Genus Notheria P. O'Byrne & J.J. Vermeulen, 2000
- Genus Nothodoritis Z.H. Tsi, 1989
- Genus Nothostele L.A. Garay, 1982
- Genus Notiophrys Lindley, 1857
- Genus Notolidium J.M.H. Shaw, 2009
- Genus Nottara F.W. Clarke, 2018
- Genus Notylettia Hort., 1989
- Genus Notylia Lindley, 1825
- Genus Notylidium Hort., 1976
- Genus Notyliopsis P. Ortiz, 1996
- Genus Notylopsis Hort., 1987
- Genus Nuccioara A. Nuccio, 2005
- Genus Nujiangia X.H. Jin & D.Z. Li, 2012 accepted as Gennaria Parlatore, 1860
- Genus Nyctosma Rafinesque, 1837 accepted as Epidendrum Linnaeus, 1763
- Genus Oakesamesia C. Schweinfurth & P.H. Allen, 1948 accepted as Oakes-amesia C. Schweinfurth & P.H. Allen, 1948
- Genus Oakes-amesia C. Schweinfurth & P.H. Allen, 1948 accepted as Sphyrastylis Schlechter, 1920
- Genus Oakesara J.M.H. Shaw, 2011
- Genus Oberonia Lindley, 1830
- Genus Oberonioides D.L. Szlachetko, 1995
- Genus Obrienara J.M.H. Shaw, 2009
- Genus Ocampoa A. Richard & Galeotti, 1845 accepted as Cranichis O. Swartz, 1788
- Genus Ochyrella D.L. Szlachetko & R.G. Tamayo, 1996 accepted as Pteroglossa Schlechter, 1920
- Genus Octadesmia Bentham, 1881 accepted as Dilomilis Rafinesque, 1838
- Genus Octandrorchis F.G. Brieger, 1977 accepted as Octomeria R. Brown in W.T. Aiton, 1813
- Genus Octarrhena Thwaites, 1861
- Genus Octomeria R. Brown in W.T. Aiton, 1813
- Genus Oddyara Hort., 1997
- Genus Oderara J.M.H. Shaw, 2002
- Genus Odisha S. Misra, 2007
- Genus Odonchlodiopsis J.M.H. Shaw, 2004
- Genus Odonectis Rafinesque, 1808 accepted as Isotria Rafinesque, 1808
- Genus Odontioda Hort., 1904
- Genus Odontiopsis J.M.H. Shaw, 2004 accepted as Odontiopsis J.M.H. Shaw, 2005
- Genus Odontiopsis J.M.H. Shaw, 2005 accepted as Odontoglopsis J.M.H. Shaw & U.B. Deshmukh, 2022
- Genus Odontobrassia Hort., 1935
- Genus Odontocentrum J.M.H. Shaw, 2004
- Genus Odontochilus Blume, 1858 (?)
- Genus Odontocidium Hort., 1911
- Genus Odontoglopsis J.M.H. Shaw & U.B. Deshmukh, 2022
- Genus Odontoglossum Kunth in Humboldt, Bonpland & Kunth, 1816
- Genus Odontokoa J.M.H. Shaw, 2004
- Genus Odontonia Rolfe, 1905
- Genus Odontopilia Hort., 1987
- Genus Odontopolia Hort., 1987 accepted as Odontopilia Hort., 1987
- Genus Odontorchis D. Tyteca & E. Klein, 2008 accepted as Neotinea H.G. Reichenbach, 1852
- Genus Odontorettia Hort., 1975
- Genus Odontorrhynchus M.N. Correa, 1953
- Genus Odontostele J.M.H. Shaw, 2004 accepted as Odontostele J.M.H. Shaw, 2005
- Genus Odontostele J.M.H. Shaw, 2005
- Genus Odontostyles J.G.S. van Breda, H. Kuhl & J.C. van Hasselt, 1827 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Odontostylis Blume, 1828
- Genus Odontostylis Breda, 1828
- Genus Odontozelencidium J.M.H. Shaw, 2004
- Genus Odopetalon G. Hansen, 1895
- Genus Odopetalum G. Hansen, 1895
- Genus Oeceoclades Lindley, 1832
- Genus Oeonia J. Lindley, 1824
- Genus Oeoniella Schlechter, 1918
- Genus Oeorchis L. Glicenstein, 2012
- Genus Oerstedella H.G. Reichenbach, 1852
- Genus Oerstedkeria J.M.H. Shaw, 2004
- Genus Oerstelaelia J.M.H. Shaw, 2004
- Genus Oerstonia J.M.H. Shaw, 2004
- Genus Oestlundia W.E. Higgins, 2001
- Genus Oestlundorchis D.L. Szlachetko, 1991 accepted as Deiregyne Schlechter, 1920
- Genus Okaara Hort., 1980
- Genus Olgasis Rafinesque, 1837 accepted as Tolumnia Rafinesque, 1837
- Genus Oligophyton H.P. Linder in H.P. Linder & G. Williamson, 1986
- Genus Oliveriana H.G. Reichenbach, 1876
- Genus Oliverosara J.F. Jusczak, 2022
- Genus Ommatodium Lindley, 1838 accepted as Pterygodium O. Swartz, 1800
- Genus Omoea Blume, 1825
- Genus Oncandra Hort., 1994
- Genus Oncidaretia W.W.G. Moir, 1957
- Genus Oncidarettia W.W.G. Moir, 1957
- Genus Oncidasia W.W.G. Moir, 1957
- Genus Oncidenia Hort., 1966
- Genus Oncidesa Hort., 1964
- Genus Oncidettia Hort., 1963
- Genus Oncidguezia W.W.G. Moir, 1957
- Genus Oncidiella Hort., 1984
- Genus Oncidioda Hort., 1910
- Genus Oncidium O. Swartz, 1800
- Genus Oncidodontopsis J.M.H. Shaw, 2005
- Genus Oncidodontopsis J.M.H. Shaw, 2004 accepted as Oncidodontopsis J.M.H. Shaw, 2005
- Genus Oncidophora Hort., 1970
- Genus Oncidopsiella J.M.H. Shaw, 2004 accepted as Oncidopsiella J.M.H. Shaw, 2005
- Genus Oncidopsiella J.M.H. Shaw, 2005
- Genus Oncidopsis J.M.H. Shaw, 2004 accepted as Oncidopsis J.M.H. Shaw, 2005
- Genus Oncidopsis J.M.H. Shaw, 2005
- Genus Oncidpilia Hort., 1966
- Genus Oncidumnia J.M.H. Shaw, 2005
- Genus Oncidumnia J.M.H. Shaw, 2004 accepted as Oncidumnia J.M.H. Shaw, 2005
- Genus Oncitonioides J.M.H. Shaw, 2004
- Genus Oncodia Lindley, 1853 accepted as Brachtia H.G. Reichenbach, 1850
- Genus Oncophyllum D.L. Jones & M.A. Clements, 2001
- Genus Oncostele J.M.H. Shaw, 2003
- Genus Oncostelopsis J.M.H. Shaw, 2011
- Genus Onkeripus Rafinesque, 1838 accepted as Xylobium Lindley, 1825
- Genus Onoara Wreford, 1967
- Genus Onrodenkoa J.M.H. Shaw, 2004
- Genus Ontolezia J.M.H. Shaw, 2005
- Genus Ontolezia J.M.H. Shaw, 2004 accepted as Ontolezia J.M.H. Shaw, 2005
- Genus Ontolglossum J.M.H. Shaw, 2005
- Genus Ontolglossum J.M.H. Shaw, 2004 accepted as Ontolglossum J.M.H. Shaw, 2005
- Genus Onychium Blume, 1825 accepted as Dendrobium O. Swartz, 1799
- Genus Onzelcentrum J.M.H. Shaw, 2005
- Genus Onzelcentrum J.M.H. Shaw, 2004 accepted as Onzelcentrum J.M.H. Shaw, 2005
- Genus Onzelettia J.M.H. Shaw, 2004
- Genus Onzeloda J.M.H. Shaw, 2005
- Genus Onzeloda J.M.H. Shaw, 2004 accepted as Onzeloda J.M.H. Shaw, 2005
- Genus Onzelumnia J.M.H. Shaw, 2005
- Genus Onzelumnia J.M.H. Shaw, 2004 accepted as Onzelumnia J.M.H. Shaw, 2005
- Genus Ophidion C.A. Luer, 1982
- Genus Ophioglossella A. Schuiteman & P. Ormerod, 1998
- Genus Ophramptis J.M.H. Shaw, 2003
- Genus Ophris P. Miller, 1754
- Genus Ophrys Linnaeus, 1753
- Genus Opilionanthe A.P. Karremans & D. Bogarín in Bogarín et al., 2018
- Genus Opoixara J.M.H. Shaw, 2008
- Genus Opsisanda Hort., 1949
- Genus Opsisanthe R.E. Schultes & A.S. Pease, 1963
- Genus Opsiscattleya Hort., 1985
- Genus Opsistylis Hort., 1970
- Genus Orchiaceras E.G. Camus, 1892
- Genus Orchi-aceras E.G. Camus, 1892 accepted as Orchiaceras E.G. Camus, 1892
- Genus Orchiastrum Seguier, 1754 accepted as Spiranthes L.C. Richard, 1817
- Genus Orchicoeloglossum P. Ascherson & P. Graebner, 1907
- Genus Orchidacites A. Straus, 1969 †
- Genus Orchidactyla P.F. Hunt & V.S. Summerhayes, 1965
- Genus Orchidactylorhiza R. Soó & O. Borsos, 1966
- Genus Orchidanacamptis Labrie in Guétrot, 1927
- Genus Orchidion J. Mitchell, 1769
- Genus Orchidites S.Q. Wu, 1999 †
- Genus Orchidium O. Swartz in J.W. Palmstruch, 1816 accepted as Calypso R.A. Salisbury, 1807
- Genus Orchidofunckia A. Richard & Galeotti, 1845 accepted as Cryptarrhena R. Brown, 1816
- Genus Orchidotypus Kraenzlin, 1906 accepted as Pachyphyllum Kunth in Humboldt, Bonpland & Kunth, 1816
- Genus Orchigymnadenia E.G. Camus, 1892
- Genus Orchi-gymnadenia E.G. Camus, 1892 accepted as Orchigymnadenia E.G. Camus, 1892
- Genus Orchimantoglossum P. Ascherson & P. Graebner, 1907
- Genus Orchinea J.M.H. Shaw, 2003
- Genus Orchiodes O. Kuntze, 1891 accepted as Goodyera R. Brown in W.T. Aiton, 1813
- Genus Orchiophrys Hort., 1999
- Genus Orchipedum Breda, 1829
- Genus Orchiplatanthera E.G. Camus, 1892
- Genus Orchis Linnaeus, 1753
- Genus Orchiserapias E.G. Camus, 1892
- Genus Orchi-Serapias E.G. Camus, 1892 accepted as Orchiserapias E.G. Camus, 1892
- Genus Oreophilus W.E. Higgins & F. Archila, 2009 accepted as Andinia (C.A. Luer) C.A. Luer, 2000
- Genus Oreorchis Lindley, 1858
- Genus Orestia H.N. Ridley, 1887
- Genus Orestias H.N. Ridley, 1887
- Genus Orleanesia Barbosa Rodrigues, 1877
- Genus Ormerodia D.L. Szlachetko, 2003
- Genus Ormostema Rafinesque, 1838 accepted as Dendrobium O. Swartz, 1799
- Genus Ornitharium Lindley & Paxton, 1851 accepted as Pteroceras Hasselt ex Hasskarl, 1842
- Genus Ornithidium R. Brown in W.T. Aiton, 1813
- Genus Ornithocephalus W.J. Hooker, 1824
- Genus Ornithochilus (Wallich ex Lindley) Bentham & J.D. Hooker, 1883
- Genus Ornithocidium M. Leinig, 1969
- Genus Ornithophora Barbosa Rodrigues, 1882 accepted as Sigmatostalix H.G. Reichenbach, 1852
- Genus Orsidice H.G. Reichenbach, 1854 accepted as Thrixspermum Loureiro, 1790
- Genus Orthoceras R. Brown, 1810
- Genus Orthochilus Hochstetter ex A. Richard, 1850 accepted as Eulophia R. Brown, 1821
- Genus Orthopenthea Rolfe in Thiselton-Dyer, 1912 accepted as Disa P.J. Bergius, 1767
- Genus Ortmannia Opiz, 1834 accepted as Geodorum G. Jackson in H.C. Andrews, 1811
- Genus Orxera Rafinesque, 1838 accepted as Aerides Loureiro, 1790
- Genus Osmentara Hort., 1966
- Genus Osmoglossum (Schlechter) Schlechter, 1922
- Genus Ossiculum P.J. Cribb & F.M. van der Laan in F.M. van der Laan & P.J. Cribb, 1986
- Genus Osyricera Blume, 1825
- Genus Otaara Hort., 1982
- Genus Otandra R.A. Salisbury, 1812 accepted as Geodorum G. Jackson in H.C. Andrews, 1811
- Genus Otobrastonia J.M.H. Shaw, 2010
- Genus Otochilus Lindley, 1830 accepted as Coelogyne J. Lindley, 1821?
- Genus Otocolax Hort., 1970
- Genus Otoglochilum H. Liebman, 2010
- Genus Otoglossum (Schlechter) Garay & Dunsterville in Dunsterville & Garay, 1976
- Genus Otohartia J.M.H. Shaw, 2014
- Genus Otonisia Hort., 1969
- Genus Otopabstia L.A. Garay, 1973
- Genus Otopetalum Lehmann & Kraenzlin, 1899 accepted as Pleurothallis R. Brown in W.T. Aiton, 1813
- Genus Otorhynchocidium J.M.H. Shaw, 2010
- Genus Otosepalum Hort., 1970
- Genus Otostele J.M.H. Shaw, 2010
- Genus Otostylis Schlechter, 1918
- Genus Ottoara J.M.H. Shaw, 2017
- Genus Owensara Hort., 1980
- Genus Oxyanthera A.T. Brongniart in Duperrey, 1834
- Genus Oxyglossellum (F.R.R. Schlechter) M.A. Clements & D.L. Jones, 2002 accepted as Dendrobium O. Swartz, 1799
- Genus Oxysepala R. Wight, 1851 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Oxystophyllum Blume, 1825 accepted as Dendrobium O. Swartz, 1799
- Genus Pabanisia J.M.H. Shaw, 2003
- Genus Pabstara J.M.H. Shaw, 2009
- Genus Pabstia Garay, 1973
- Genus Pabstiella F.G. Brieger & K. Senghas, 1976 accepted as Pleurothallis R. Brown in W.T. Aiton, 1813
- Genus Pabstosepalum J.M.H. Shaw, 2003
- Genus Pachites Lindley, 1835
- Genus Pachychilus Blume, 1828 accepted as Pachystoma Blume, 1825
- Genus Pachygenium (F.R.R. Schlechter) D.L. Szlachetko, R. González Tamayo & P. Rutkowski, 2001
- Genus Pachyne R.A. Salisbury, 1812 accepted as Phaius Loureiro, 1790
- Genus Pachyphyllum Kunth in Humboldt, Bonpland & Kunth, 1816
- Genus Pachyplectron Schlechter, 1906
- Genus Pachyrhizanthe (Schlechter) Nakai, 1931 accepted as Cymbidium O. Swartz, 1799
- Genus Pachystele Schlechter, 1923 accepted as Scaphyglottis Poeppig & Endlicher, 1836
- Genus Pachystelis S. Rauschert, 1983 accepted as Scaphyglottis Poeppig & Endlicher, 1836
- Genus Pachystoma Blume, 1825
- Genus Pachystylis C.L. von Blume accepted as Pachystoma Blume, 1825
- Genus Pacisthos D.L. Szlachetko, 2021
- Genus Pageara Hort., 1978
- Genus Palaeorchis A. Massalongo, 1858 †
- Genus Palermoara Hort., 1998
- Genus Paliris Dumortier, 1827 accepted as Liparis L.C. Richard, 1817
- Genus Palmerara Hort., 1973
- Genus Palmoglossum J.F. Klotzsch ex H.G. Reichenbach, 1856 accepted as Pleurothallis R. Brown in W.T. Aiton, 1813
- Genus Palmorchis Barbosa Rodrigues, 1877
- Genus Paludomeulenia P. Delforge, 2009 accepted as Anacamptis L.C. Richard, 1817
- Genus Paludorchis P. Delforge, 2009 accepted as Anacamptis L.C. Richard, 1817
- Genus Paludorchiserapias P. Delforge, 2009 accepted as Serapicamptis Godfery, 1921
- Genus Palumbina H.G. Reichenbach in C. Müller, 1863
- Genus Panczkara
- Genus Panisea (Lindley) Lindley, 1854 accepted as Coelogyne J. Lindley, 1821?
- Genus Panstrepis Rafinesque, 1838 accepted as Coryanthes W.J. Hooker, 1831
- Genus Pantapaara Hort., 1977
- Genus Pantlingia D. Prain, 1896 accepted as Stigmatodactylus C.J. Maximowicz ex T. Makino, 1891
- Genus Paorchis M.C. Pace, 2020
- Genus Paphinia Lindley, 1843
- Genus Paphinopea J.M.H. Shaw, 2012
- Genus Paphiopedilum Pfitzer, 1886
- Genus Papilachnis L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Papilaenopsis J.M.H. Shaw, 2013
- Genus Papilaenostylis J.M.H. Shaw, 2013
- Genus Papilandachnis L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Papilanthera L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Papilanthopsis J.M.H. Shaw, 2018
- Genus Papiliocentrum L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Papiliodes L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Papilionanda R.E. Schultes & A.S. Pease, 1963
- Genus Papilionanthe Schlechter, 1915
- Genus Papilionetia L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Papiliopsis E. Morren, 1874 accepted as Oncidium O. Swartz, 1800
- Genus Papiliopsis L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Papiliosarcanthopsis J.M.H. Shaw, 2013
- Genus Papiliovanvanda J.M.H. Shaw, 2013
- Genus Papilisia L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Papillilabium A.W. Dockrill, 1967
- Genus Papillochilus K.W. Western, 2012
- Genus Papitonia J.M.H. Shaw, 2013
- Genus Papopsis J.M.H. Shaw, 2013
- Genus Papperitzia H.G. Reichenbach, 1852
- Genus Papuaea Schlechter, 1919
- Genus Papulipetalum (F.R.R. Schlechter) M.A. Clements & D.L. Jones, 2002 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Paracalanthe Y. Kudo, 1930 accepted as Calanthe R. Brown, 1821
- Genus Paracaleana D.F. Blaxell, 1972 accepted as Caleana R. Brown, 1810
- Genus Paracentrum J.M.H. Shaw, 2002
- Genus Parachilus Hort., 1972
- Genus Paradisanisia G. Schmidt & J.M.H. Shaw, 2010
- Genus Paradisanthus H.G. Reichenbach, 1852
- Genus Paradistia J.M.H. Shaw, 2013
- Genus Parafinetia J. Rosenberg, 2009
- Genus Paragnathis K.P.J. Sprengel, 1826 accepted as Diplomeris D. Don, 1825
- Genus Paraholcoglossum Z.J. Liu, S.C. Chen & L.J. Chen, 2011 accepted as Holcoglossum Schlechter, 1919
- Genus Paralophia P.J. Cribb & J. Hermans, 2005
- Genus Paramayara L.A. Garay & H.R. Sweet, 1974
- Genus Parandachnis L.A. Garay & H.R. Sweet, 1966
- Genus Parandanthe L.A. Garay & H.R. Sweet, 1966
- Genus Paranthe L.A. Garay & H.R. Sweet, 1966
- Genus Paranthera L.A. Garay & H.R. Sweet, 1966
- Genus Paraottis J.M.H. Shaw, 2002
- Genus Parapactis W. Zimmermann, 1922 accepted as Epipactis Zinn, 1757
- Genus Parapapilio L.A. Garay & H.R. Sweet, 1974
- Genus Parapapilisia E.P. Hendra, 2021
- Genus Paraphachilus J.M.H. Shaw, 2010
- Genus Paraphadenia J.M.H. Shaw, 2013
- Genus Paraphaius J.W. Zhai & F.W. Xing, 2014 accepted as Phaius Loureiro, 1790
- Genus Paraphalaenopsis A.D. Hawkes, 1964
- Genus Paraphalanthe J.M.H. Shaw, 2013
- Genus Paraphalraecum J.M.H. Shaw, 2011
- Genus Paraphaluisia J.M.H. Shaw & U.B. Deshmukh, 2021
- Genus Paraprasophyllum M.A. Clements & D.L. Jones, 2019
- Genus Parapteroceras Averyanov, 1990
- Genus Paraptosiella J.M.H. Shaw, 2010
- Genus Pararachnis A.D. Hawkes, 1964
- Genus Pararenanthadenia H.C. Pritchard, 2023
- Genus Pararenanthera A.D. Hawkes, 1964
- Genus Pararides L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Parasarcochilus A.W. Dockrill, 1967 accepted as Sarcochilus R. Brown, 1810
- Genus Parastylis J.M.H. Shaw, 2002
- Genus Paravanda A.D. Hawkes, 1964
- Genus Paravandaenopsis J.M.H. Shaw, 2013
- Genus Paravandanthera L.A. Garay & H.R. Sweet, 1966
- Genus Paravandopsis J.M.H. Shaw, 2002
- Genus Paravandrum J.M.H. Shaw, 2002
- Genus Parhabenaria Gagnepain, 1932 accepted as Pecteilis Rafinesque, 1837
- Genus Parisia J.M.H. Shaw, 2002 accepted as Paraphaluisia J.M.H. Shaw & U.B. Deshmukh, 2021
- Genus Parlatorea Barbosa Rodrigues, 1877 accepted as Sanderella O. Kuntze, 1891
- Genus Parnataara Hort., 1980
- Genus Parottis accepted as Paraottis J.M.H. Shaw, 2002
- Genus Pattonia R. Wight, 1851 accepted as Grammatophyllum Blume, 1825
- Genus Paulalbertstormara P.A. Storm & J.M.H. Shaw, 2019
- Genus Paulandmarystormara P.A. Storm & J.M.H. Shaw, 2015
- Genus Paulara Hort., 1986
- Genus Paulsenara Hort., 1972
- Genus Paulstormara P.A. Storm & J.M.H. Shaw, 2012
- Genus Pavonara J.M.H. Shaw, 2004 accepted as Pavonara J.M.H. Shaw, 2005
- Genus Pavonara J.M.H. Shaw, 2005
- Genus Paxtonia Lindley, 1838 accepted as Spathoglottis Blume, 1825
- Genus Paynterara J.M.H. Shaw, 2007
- Genus Peaseara J.M.H. Shaw, 2011
- Genus Pectabenaria A.D. Hawkes, 1961
- Genus Pecteilis Rafinesque, 1837
- Genus Pectinaria E. Jacob de Cordemoy, 1899 accepted as Angraecum Bory de St.-Vincent, 1804
- Genus Pectinariella D.L. Szlachetko, J. Mytnik-Ejsmont & E. Grochocka, 2013 accepted as Angraecum Bory de St.-Vincent, 1804
- Genus Pedilea J. Lindley in W.J. Hooker, 1824 accepted as Malaxis Solander ex O. Swartz, 1788
- Genus Pedilochilus Schlechter in K.M. Schumann & Lauterbach, 1905
- Genus Pedilonum Blume, 1825 accepted as Dendrobium O. Swartz, 1799
- Genus Peetersara J.M.H. Shaw, 2007
- Genus Pehara Hort., 1983
- Genus Pelacentrum Hort., 1974
- Genus Pelachilus Hort., 1980
- Genus Pelastylis Hort., 1986
- Genus Pelatanda J.M.H. Shaw, 2013
- Genus Pelatanthe J.M.H. Shaw, 2022
- Genus Pelatantheria Ridley, 1896
- Genus Pelathanopsis J.M.H. Shaw, 2013
- Genus Pelatoritis Hort., 1985
- Genus Pelexia Poiteau ex Lindley, 1826
- Genus Pelma Finet, 1909 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Pendletonara J.M.H. Shaw, 2012
- Genus Penducella C.A. Luer & L.T. Thoerle, 2010 accepted as Andinia (C.A. Luer) C.A. Luer, 2000
- Genus Pendulorchis Z.J. Liu, K.W. Liu & G.Q. Zhang, 2013 accepted as Holcoglossum Schlechter, 1919
- Genus Pendusalpinx A.P. Karremans & M. Fernández in Bogarín et al., 2018
- Genus Penkimia S. Phukan & N. Odyuo, 2006
- Genus Pennellara J.M.H. Shaw, 2011
- Genus Pennilabium J.J. Smith, 1914
- Genus Penthea Lindley, 1838 accepted as Disa P.J. Bergius, 1767
- Genus Pentisea (J. Lindley) D.L. Szlachetko, 2001 accepted as Caladenia R. Brown, 1810
- Genus Pentulops Rafinesque, 1838 accepted as Heterotaxis J. Lindley, 1826
- Genus Pepeara Hort., 1995
- Genus Peramium R.A. Salisbury ex J.M. Coulter, 1894 accepted as Goodyera R. Brown in W.T. Aiton, 1813
- Genus Peramium R.A. Salisbury ex C. MacMillan, 1892 accepted as Epipactis Zinn, 1757
- Genus Pergamena Finet, 1900 accepted as Dactylostalix H.G. Reichenbach, 1878
- Genus Perihopea J.M.H. Shaw, 2023
- Genus Peristeranthus T.E. Hunt, 1954
- Genus Peristerchilus Hort., 1997
- Genus Peristeria W.J. Hooker, 1831
- Genus Peristorrhiza T. Clarke, 2020
- Genus Peristylus Blume, 1825
- Genus Perreiraara Hort., 1969
- Genus Perrierangraecum (F.R.R. Schlechter) D.L. Szlachetko, J. Mytnik-Ejsmont & E. Grochocka, 2013 accepted as Angraecum Bory de St.-Vincent, 1804
- Genus Perrieriella Schlechter, 1925 accepted as Oeonia J. Lindley, 1824
- Genus Perularia Lindley, 1835 accepted as Platanthera L.C. Richard, 1817
- Genus Pescabstia J. Weigner, 2011
- Genus Pescantleya J.M.H. Shaw, R.A. Stevens & G. Black, 2004
- Genus Pescarhyncha Hort., 1961
- Genus Pescascaphe J.M.H. Shaw, 2010
- Genus Pescatobollea Rolfe, 1902
- Genus Pescatoria H.G. Reichenbach, 1852
- Genus Pescatoscaphe E.A. Christenson, 2006
- Genus Pescawarrea Hort., 1983
- Genus Pescenia S. Ohba & J.M.H. Shaw, 2001
- Genus Pescoranthes Hort., 1961
- Genus Pesmanara J.M.H. Shaw, 2011
- Genus Pesomeria Lindley, 1838 accepted as Phaius Loureiro, 1790
- Genus Petalocentrum Schlechter, 1918 accepted as Sigmatostalix H.G. Reichenbach, 1852
- Genus Petalochilus R.S. Rogers, 1924 accepted as Caladenia R. Brown, 1810
- Genus Peterhuntara J.M.H. Shaw, 2014
- Genus Petronia Barbosa Rodrigues, 1877
- Genus Pettitara Hort., 1983
- Genus Phadrosanthus Necker ex Rafinesque, 1838 accepted as Epidendrum Linnaeus, 1763
- Genus Phaiocalanthe Rolfe, 1887
- Genus Phaiocymbidium G.F. Moore, 1902
- Genus Phaiopreptanthe Kerchove, 1894
- Genus Phaius Loureiro, 1790
- Genus Phajopreptanthe Kerchove, 1894
- Genus Phalaeglossum J.M.H. Shaw, 2013
- Genus Phalaenetia Hort., 1964
- Genus Phalaenidium L.A. Garay & H.R. Sweet, 1974
- Genus Phalaenopsis Blume, 1825
- Genus Phalaensonia J.M.H. Shaw, 2013
- Genus Phalaentoma M. Chanyangam, 2019
- Genus Phalaerianda Hort., 1951
- Genus Phalandopsis Hort., 1960
- Genus Phaleralda J.M.H. Shaw, 2003
- Genus Phaliella Hort., 1972
- Genus Phalphalaenopsis J.M.H. Shaw, 2002
- Genus Phalvanvanda J.M.H. Shaw, 2013
- Genus Phaniasia C.L. von Blume ex F.A.W. Miquel, 1865-1866 accepted as Habenaria Willdenow, 1805
- Genus Pharochilum D.L. Jones & M.A. Clements, 2002 accepted as Pterostylis R. Brown, 1810
- Genus Pheladenia D.L. Jones & M.A. Clements, 2001
- Genus Phelodia J. Kellermann in Kellermann & Monro, 2021 accepted as Glossadenia Hort. ex J.M.H. Shaw, 2014
- Genus Philippiara J.M.H. Shaw, 2005
- Genus Philippiara J.M.H. Shaw, 2004 accepted as Philippiara J.M.H. Shaw, 2005
- Genus Philippinaea Schlechter & Ames in Ames, 1920 accepted as Orchipedum Breda, 1829
- Genus Phillipsara Hort., 1978
- Genus Phloeophila Hoehne & Schlechter, 1926 accepted as Pleurothallis R. Brown in W.T. Aiton, 1813
- Genus Pholidota Lindley ex W.J. Hooker, 1825 accepted as Coelogyne J. Lindley, 1821?
- Genus Phoringopsis D.L. Jones & M.A. Clements in D.L. Jones, M.A. Clements, I.K. Sharma & A.M. Mackenzie, 2002 accepted as Arthrochilus F. von Mueller, 1858
- Genus Phormangis Schlechter, 1918 accepted as Ancistrorhynchus Finet, 1907
- Genus Phragmipaphium Hort., 1936
- Genus Phragmipedium Rolfe, 1896
- Genus Phragmopaphium R. Mansfeld, 1936 accepted as Phragmipaphium Hort., 1936
- Genus Phragmorchis L.O. Williams, 1938
- Genus Phreatia Lindley, 1830
- Genus Phyllomphax Schlechter, 1919 accepted as Brachycorythis J. Lindley, 1838
- Genus Phyllorchis L.M.A. du P. Thouars, 1822
- Genus Phyllorkis Du Petit-Thouars, 1809 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Phymatidiopsis D.L. Szlachetko, 2006
- Genus Phymatidium Lindley, 1833
- Genus Phymatochilum E.A. Christenson, 2006
- Genus Physinga Lindley, 1838 accepted as Epidendrum Linnaeus, 1763
- Genus Physoceras Schlechter, 1925
- Genus Physogyne L.A. Garay, 1982
- Genus Physosiphon Lindley, 1835 accepted as Pleurothallis R. Brown in W.T. Aiton, 1813
- Genus Physothallis Garay, 1953 accepted as Pleurothallis R. Brown in W.T. Aiton, 1813
- Genus Physurus L.C. Richard ex Lindley, 1840 accepted as Erythrodes Blume, 1825
- Genus Pierardia Rafinesque, 1838 accepted as Dendrobium O. Swartz, 1799
- Genus Pilophyllum Schlechter, 1914
- Genus Pilumna Lindley, 1844 accepted as Trichopilia Lindley, 1836
- Genus Pinalia J. Lindley, 1826 accepted as Eria J. Lindley, 1825
- Genus Pinelia Lindley, 1853
- Genus Pinelianthe S. Rauschert, 1983 accepted as Pinelia Lindley, 1853
- Genus Piperia Rydberg, 1901 accepted as Platanthera L.C. Richard, 1817
- Genus Pittara J.M.H. Shaw, 2007
- Genus Pittierella Schlechter, 1906 accepted as Cryptocentrum Bentham, 1880
- Genus Pityphyllum Schlechter, 1920
- Genus Placostigma Blume, 1828 accepted as Podochilus Blume, 1825
- Genus Planetangis T. Stévart & J.N.M. Farminhão, 2020
- Genus Platanthera L.C. Richard, 1817
- Genus Platyclinis Bentham, 1881 accepted as Dendrochilum Blume, 1825
- Genus Platycoryne H.G. Reichenbach, 1855
- Genus Platyglottis L.O. Williams, 1942
- Genus Platylepis A. Richard, 1828
- Genus Platypus J.K. Small & Nash in J.K. Small, 1903 accepted as Eulophia R. Brown, 1821
- Genus Platyrhiza Barbosa Rodrigues, 1881
- Genus Platysma Blume, 1825 accepted as Podochilus Blume, 1825
- Genus Platystele Schlechter, 1910
- Genus Platystylis (Blume) Lindley, 1830 accepted as Liparis L.C. Richard, 1817
- Genus Platythelys L.A. Garay, 1977
- Genus Plectochilus Hort., 1976
- Genus Plectoglossa (J.D. Hooker) K. Prasad & P. Venu, 2015 accepted as Habenaria Willdenow, 1805
- Genus Plectorrhiza A.W. Dockrill, 1967
- Genus Plectrelgraecum Hort., 1985
- Genus Plectrelminthus Rafinesque, 1838
- Genus Plectrophora Focke, 1848
- Genus Plectrurus Rafinesque, 1825 accepted as Tipularia Nuttall, 1818
- Genus Plecturus Rafinesque accepted as Plectrurus Rafinesque, 1825
- Genus Pleione D. Don, 1825
- Genus Pleionilla J.M.H. Shaw, 2003
- Genus Pleuranthium (H.G. Reichenbach) Bentham, 1881 accepted as Epidendrum Linnaeus, 1763
- Genus Pleurobotryum Barbosa Rodrigues, 1877 accepted as Pleurothallis R. Brown in W.T. Aiton, 1813
- Genus Pleurothallis R. Brown in W.T. Aiton, 1813
- Genus Pleurothallopsis Campos Porto & Brade, 1937 accepted as Octomeria R. Brown in W.T. Aiton, 1813
- Genus Plexaure Endlicher, 1833 accepted as Phreatia Lindley, 1830
- Genus Plocoglottis Blume, 1825
- Genus Plumatichilos D.L. Szlachetko, 2001 accepted as Pterostylis R. Brown, 1810
- Genus Plumatistylis J.M.H. Shaw, 2003
- Genus Poaephyllum H.N. Ridley, 1907
- Genus Podandria Rolfe in Thiselton-Dyer, 1898
- Genus Podangis Schlechter, 1918
- Genus Podanthera R. Wight, 1851 accepted as Epipogium Gmelin ex Borkhausen, 1792
- Genus Podochilopsis Guillaumin, 1963
- Genus Podochilus Blume, 1825
- Genus Poeppigara J.M.H. Shaw, 2005
- Genus Poeppigara J.M.H. Shaw, 2004 accepted as Poeppigara J.M.H. Shaw, 2005
- Genus Pogochilus Falconer in W.J. Hooker, 1841 accepted as Galeola Loureiro, 1790
- Genus Pogonia A.L. Jussieu, 1789
- Genus Pogoniopsis H.G. Reichenbach, 1881
- Genus Pollettara J.M.H. Shaw, 2010
- Genus Pollinirhiza Dulac, 1867 accepted as Listera R. Brown in W.T. Aiton, 1813
- Genus Polybactrum R.A. Salisbury, 1814 accepted as Pseudorchis Séguier, 1754
- Genus Polychilos Breda, 1828 accepted as Phalaenopsis Blume, 1825
- Genus Polycycnis H.G. Reichenbach, 1855
- Genus Polycycnopsis D.L. Szlachetko, 2006 accepted as Polycycnis H.G. Reichenbach, 1855
- Genus Polyotidium Garay, 1958
- Genus Polyphylax W. Fennell & J.M.H. Shaw, 2001
- Genus Polyradicion Garay, 1969
- Genus Polyrrhiza Pfitzer in Engler & Prantl, 1889 accepted as Polyradicion Garay, 1969
- Genus Polysellia J.M.H. Shaw, 2018
- Genus Polystachya W.J. Hooker, 1824
- Genus Polystylus Van Hasselt ex Hasskarl, 1855 accepted as Phalaenopsis Blume, 1825
- Genus Polytoma J. de Loureiro ex B.A. Gomes, 1868 accepted as Bletilla H.G. Reichenbach, 1852-1853
- Genus Pomacentrum Hort., 1981
- Genus Pomanda J.M.H. Shaw, 2013
- Genus Pomatisia Hort., 1973
- Genus Pomatocalpa Breda, 1829
- Genus Pomatochilus Hort., 1998
- Genus Pomatotheria M. Chanyangam, 2020
- Genus Ponera Lindley, 1831
- Genus Ponerorchis H.G. Reichenbach, 1852
- Genus Ponerostigma J.M.H. Shaw, 2003
- Genus Ponterara J.M.H. Shaw, 2002
- Genus Ponthieva R. Brown in W.T. Aiton, 1813
- Genus Pooleara Hort., 1995
- Genus Porolabium T. Tang & F.T. Wang, 1940
- Genus Porpax J. Lindley, 1845
- Genus Porphyrachnis L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Porphyranda L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Porphyrandachnis L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Porphyranthera L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Porphyrodesme Schlechter, 1913
- Genus Porphyroglottis Ridley, 1896
- Genus Porphyrolexia L. Glicenstein, 2020
- Genus Porphyrorhynchos L. Glicenstein, 2009
- Genus Porphyrostachys H.G. Reichenbach, 1854
- Genus Porroglossum Schlechter, 1920
- Genus Porrorhachis Garay, 1972
- Genus Porrovallia Hort., 1993
- Genus Porterara Hort., 1998
- Genus Portoara J.M.H. Shaw, 2008
- Genus Posadaara J.M.H. Shaw, 2005
- Genus Posadaara J.M.H. Shaw, 2004 accepted as Posadaara J.M.H. Shaw, 2005
- Genus Potinara Hort., 1922
- Genus Potosia (F.R.R. Schlechter) R. González Tamayo & D.L. Szlachetko ex J. Mytnik-Ejsmont, 2003
- Genus Pourbaixara Z.-H. Feng & J.M.H. Shaw, 2022
- Genus Powellara J.M.H. Shaw, 2007
- Genus Pradhanara U.C. Pradhan, 2016
- Genus Praecoxanthus S.D. Hopper & A.P. Brown, 2000
- Genus Prapinara R. Uaprayoonvong, 2011
- Genus Prasophyllum R. Brown, 1810
- Genus Preptacalanthe J.M.H. Shaw, 2013
- Genus Preptanthe H.G. Reichenbach, 1853 accepted as Calanthe R. Brown, 1821
- Genus Prescotia Lindley, 1824 accepted as Prescottia J. Lindley in W.J. Hooker, 1824
- Genus Prescottia J. Lindley in W.J. Hooker, 1824
- Genus Pridgeonia F. Pupulin, 2019
- Genus Pristiglottis Cretzoiu & J.J. Smith, 1934 accepted as Odontochilus Blume, 1858 (?)
- Genus Probaranthe L. Glicenstein, 2012
- Genus Procaste L. Glicenstein, 2013
- Genus Procatavola J.M.H. Shaw, 2005
- Genus Prochaea L. Glicenstein, 2013
- Genus Procycleya J.M.H. Shaw, 2004
- Genus Prodendranthe J.M.H. Shaw, 2016
- Genus Proguarleya J.M.H. Shaw, 2007
- Genus Prokeria J.M.H. Shaw, 2020
- Genus Prolax Hort., 1985
- Genus Proleytonia J.M.H. Shaw, 2008
- Genus Promadisanthus L. Glicenstein, 2013
- Genus Promarrea L. Glicenstein, 2013
- Genus Promcidium L. Glicenstein, 2012
- Genus Promellia Hort., 2000
- Genus Promenabstia J.M.H. Shaw, 2003
- Genus Promenaea J. Lindley, 1843
- Genus Promenanthes Hort., 1995
- Genus Promenzella J.M.H. Shaw, 2010
- Genus Promoglossum L. Glicenstein, 2013
- Genus Promosepalum Hort., 2000
- Genus Propabstopetalum J.M.H. Shaw, 2003
- Genus Propescapetalum L. Glicenstein, 2012
- Genus Propetalon Hort., 1976
- Genus Propetalum Hort., 1976 accepted as Propetalon Hort., 1976
- Genus Prosanthopsis H. Griffits & J.M.H. Shaw, 2007
- Genus Prosarthron J.M.H. Shaw, 2004
- Genus Prosavola J.M.H. Shaw, 2005
- Genus Prosavola J.M.H. Shaw, 2004 accepted as Prosavola J.M.H. Shaw, 2005
- Genus Proscatarthron J.M.H. Shaw, 2009
- Genus Proschile J.M.H. Shaw, 2013
- Genus Proschisia L.C.M. Richard, 1817
- Genus Prosgoa J.M.H. Shaw, 2008
- Genus Proslaeliocattleya J.M.H. Shaw, 2004 accepted as Proslaeliocattleya J.M.H. Shaw, 2005
- Genus Proslaeliocattleya J.M.H. Shaw, 2005
- Genus Proslia J.M.H. Shaw, 2004
- Genus Prosophrovola J.M.H. Shaw, 2008
- Genus Prosrhyncholeya J.M.H. Shaw, 2007
- Genus Prosthechea Knowles & Westcott, 1838
- Genus Prostonia J.M.H. Shaw, 2005
- Genus Prostonia J.M.H. Shaw, 2004 accepted as Prostonia J.M.H. Shaw, 2005
- Genus Prosyclia J.M.H. Shaw, 2004
- Genus Proteroceras J. Joseph & E. Vajravelu, 1974
- Genus Protorchis Massalongo, 1858 †
- Genus Pseudacoridium O. Ames, 1922
- Genus Pseudadenia P.F. Hunt, 1971
- Genus Pseudanthera D.R. McKean, 1982
- Genus Pseudelleanthus F.G. Brieger in F.G. Brieger et al., 1983 accepted as Elleanthus K.B. Presl, 1827
- Genus Pseudencyclia G.R. Chiron & V.P. Castro, 2003
- Genus Pseudepidendrum H.G. Reichenbach, 1852 accepted as Epidendrum Linnaeus, 1763
- Genus Pseuderia Schlechter, 1912
- Genus Pseuderiopsis H.G. Reichenbach, 1850 accepted as Eriopsis J. Lindley, 1847
- Genus Pseudinium P.F. Hunt, 1971
- Genus Pseuditella P.F. Hunt, 1971
- Genus Pseudocentrum Lindley, 1858
- Genus Pseudocranichis L.A. Garay, 1982
- Genus Pseudoctomeria Kraenzlin, 1925 accepted as Pleurothallis R. Brown in W.T. Aiton, 1813
- Genus Pseudocymbidium D.L. Szlachetko & M. Sitko, 2012 accepted as Maxillaria Ruiz & Pavon, 1794
- Genus Pseudodiphryllum S.A. Nevski in V.L. Komarov, 1935 accepted as Platanthera L.C. Richard, 1817
- Genus Pseudoeria (F.R.R. Schlechter) F.R.R. Schlechter accepted as Pseuderia Schlechter, 1912
- Genus Pseudoeurystyles Hoehne, 1944 accepted as Eurystyles Wawra, 1863
- Genus Pseudogoodyera Schlechter, 1920
- Genus Pseudohemipilia D.L. Szlachetko, 2003
- Genus Pseudohexadesmia F.G. Brieger in F.G. Brieger et al., 1976 accepted as Scaphyglottis Poeppig & Endlicher, 1836
- Genus Pseudojumellea (F.R.R. Schlechter) D.L. Szlachetko, J. Mytnik-Ejsmont & E. Grochocka, 2013 accepted as Angraecum Bory de St.-Vincent, 1804
- Genus Pseudolaelia Porto & Brade, 1935
- Genus Pseudolepanthes (C.A. Luer) F. Archila, 2009 accepted as Trichosalpinx C.A. Luer, 1983
- Genus Pseudoliparis Finet, 1907 accepted as Malaxis Solander ex O. Swartz, 1788
- Genus Pseudomacodes Rolfe, 1892 accepted as Macodes (Blume) J. Lindley, 1840
- Genus Pseudomaxillaria Hoehne, 1947 accepted as Camaridium J. Lindley, 1824
- Genus Pseudoorleanesia Rauschert accepted as Orleanesia Barbosa Rodrigues, 1877
- Genus Pseudoperistylis D.L. Szlachetko & T.S. Olszewski, 1998 accepted as Habenaria Willdenow, 1805
- Genus Pseudoponera F.G. Brieger in F.G. Brieger et al., 1976 accepted as Ponera Lindley, 1831
- Genus Pseudorchis Séguier, 1754
- Genus Pseudorchis S.F. Gray, 1821
- Genus Pseudorhiza P.F. Hunt, 1971
- Genus Pseudorleanesia S. Rauschert, 1983 accepted as Orleanesia Barbosa Rodrigues, 1877
- Genus Pseudostelis Schlechter, 1922 accepted as Pleurothallis R. Brown in W.T. Aiton, 1813
- Genus Pseudovanilla L.A. Garay, 1986
- Genus Psilochilus Barbosa Rodrigues, 1882
- Genus Psittacoglossum Lexarza in La Llave & Lexarza, 1825 accepted as Camaridium J. Lindley, 1824
- Genus Psybrassocattleya J.M.H. Shaw, 2008
- Genus Psyburgkia J.M.H. Shaw, 2017
- Genus Psycattleytonia J.M.H. Shaw, 2004
- Genus Psychanthe J.M.H. Shaw, 2007
- Genus Psychassia J.M.H. Shaw, 2005
- Genus Psychassia J.M.H. Shaw, 2004 accepted as Psychassia J.M.H. Shaw, 2005
- Genus Psychavola J.M.H. Shaw, 2008
- Genus Psychechilos Breda, 1829 accepted as Zeuxine Lindley, 1826
- Genus Psychia J.M.H. Shaw, 2008
- Genus Psychilea J.M.H. Shaw, 2007
- Genus Psychilis Rafinesque, 1838
- Genus Psychocentrum J.M.H. Shaw, 2004
- Genus Psychocidium J.M.H. Shaw, 2004 accepted as Psychocidium J.M.H. Shaw, 2005
- Genus Psychocidium J.M.H. Shaw, 2005
- Genus Psychoglossum J.M.H. Shaw, 2004 accepted as Psychoglossum J.M.H. Shaw, 2005
- Genus Psychoglossum J.M.H. Shaw, 2005
- Genus Psychomesa J.M.H. Shaw, 2011
- Genus Psychophila J.M.H. Shaw, 2012
- Genus Psychopilia J.M.H. Shaw, 2004 accepted as Psychopilia J.M.H. Shaw, 2005
- Genus Psychopilia J.M.H. Shaw, 2005
- Genus Psychopsiella E. Lückel & G.J. Braem, 1982
- Genus Psychopsis Rafinesque, 1838
- Genus Psychopsychopsis J.M.H. Shaw, 2004 accepted as Psychopsychopsis J.M.H. Shaw, 2005
- Genus Psychopsychopsis J.M.H. Shaw, 2005
- Genus Psygmorchis C.H. Dodson & R.L. Dressler, 1972
- Genus Psylaeliocattleya J.M.H. Shaw, 2004
- Genus Psyleyopsis J.M.H. Shaw, 2004
- Genus Psymiltonia J.M.H. Shaw, 2004 accepted as Psymiltonia J.M.H. Shaw, 2005
- Genus Psymiltonia J.M.H. Shaw, 2005
- Genus Psyonitis J.M.H. Shaw, 2008
- Genus Psysophrocattleya J.M.H. Shaw, 2008
- Genus Psythechea J.M.H. Shaw, 2004
- Genus Psytonia J.M.H. Shaw, 2004
- Genus Pterichis Lindley, 1840
- Genus Pteroceras Hasselt ex Hasskarl, 1842
- Genus Pterochilus W.J. Hooker & Arnott, 1832 accepted as Maxillaria Ruiz & Pavon, 1794
- Genus Pteroglossa Schlechter, 1920
- Genus Pteroglossaspis H.G. Reichenbach, 1878
- Genus Pterolexia L. Glicenstein, 2015
- Genus Pteroplodium J.M.H. Shaw, 2003
- Genus Pterorhynchos J.M.H. Shaw, 2019
- Genus Pterostemma Kraenzlin, 1899
- Genus Pterostylis R. Brown, 1810
- Genus Pterygodium O. Swartz, 1800
- Genus Ptilocnema D. Don, 1825 accepted as Pholidota Lindley ex W.J. Hooker, 1825
- Genus Ptychochilus Schauer, 1843
- Genus Ptychogyne Pfitzer in Engler, 1907 accepted as Coelogyne J. Lindley, 1821?
- Genus Pupulinia A.P. Karremans & D. Bogarín, 2020
- Genus Purverara J.M.H. Shaw, 2002
- Genus Pycnantha P.F. Ravenna, 2011 accepted as Malaxis Solander ex O. Swartz, 1788
- Genus Pygmaeorchis Brade, 1939
- Genus Pynaertara J.M.H. Shaw, 2008
- Genus Pyrorchis D.L. Jones & M.A. Clements, 1995
- Genus Quechua G.A. Salazar & L. Jost, 2012
- Genus Quekettia J. Lindley, 1839
- Genus Queteletia Blume, 1859 accepted as Orchipedum Breda, 1829
- Genus Quintalara J.M.H. Shaw, 2020
- Genus Quirkara T. Quirk & J.M.H. Shaw, 2017
- Genus Quisqueya D.D. Dod, 1979
- Genus Quisumbingara L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Raciborskanthos D.L. Szlachetko, 1995
- Genus Radinocion Ridley, 1887 accepted as Aerangis H.G. Reichenbach, 1865
- Genus Rafinesqueara J.M.H. Shaw, 2004
- Genus Raganara Hort., 1985
- Genus Ramasamyara Hort., 1981
- Genus Ramonia Schlechter, 1923 accepted as Scaphyglottis Poeppig & Endlicher, 1836
- Genus Ramphidia F.A.W. Miquel, 1858 accepted as Myrmechis (Lindley) Blume, 1858 (?)
- Genus Randactyle E.A. Schelpe in E.R. Harrison, 1972
- Genus Rangaeris (Schlechter) Summerhayes, 1936 accepted as Podangis Schlechter, 1918
- Genus Ranorchis D.L. Jones & M.A. Clements, 2002 accepted as Pterostylis R. Brown, 1810
- Genus Rappartara J.M.H. Shaw, 2011
- Genus Rauhara J.M.H. Shaw, 2009
- Genus Rauhiella G.F.J. Pabst & P.I.S. Braga, 1978
- Genus Rauranita Grelet, 1897
- Genus Raycadenco C.H. Dodson, 1989
- Genus Rebeccaara J.M.H. Shaw, 2005
- Genus Recchara Hort., 1950
- Genus Rechingerara J.M.H. Shaw, 2009
- Genus Regnellia Barbosa Rodrigues, 1877 accepted as Bletia Ruiz & Pavón, 1794
- Genus Regnierara H. Griffits & J.M.H. Shaw, 2007
- Genus Rehderara H. Griffits & J.M.H. Shaw, 2007
- Genus Rehfieldara Hort., 2001
- Genus Reichara J.M.H. Shaw, 2004
- Genus Reichembachanthus Barbosa Rodrigues, 1882
- Genus Reichenbachanthus Barbosa Rodrigues, 1882
- Genus Reichenbachara L.A. Garay & H.R. Sweet, 1966
- Genus Reinikkaara L.A. Garay & H.R. Sweet, 1969
- Genus Renachilus J.M.H. Shaw, 2004
- Genus Renades Hort., 1955
- Genus Renafinanda Hort., 1976
- Genus Renaglottis Moir, 1957
- Genus Renancentrum Hort., 1962
- Genus Renanda Hort., 1961 accepted as Holttumara Hort., 1958
- Genus Renanetia Hort., 1962
- Genus Renanopsis Hort., 1949
- Genus Renanparadopsis J.M.H. Shaw, 2002
- Genus Renanstylis Hort., 1960
- Genus Renantanda Vacherot & Lecoufle, 1935
- Genus Renanthera Loureiro, 1790
- Genus Renantheranda Hort., 1938 accepted as Renantanda Vacherot & Lecoufle, 1935
- Genus Renantherella Ridley, 1896
- Genus Renanthoceras L.A. Garay & H.R. Sweet, 1969
- Genus Renanthoglossum Hort., 1963
- Genus Renanthopsis Vacherot & Lecoufle, 1931
- Genus Renaradorum L.A. Garay & H.R. Sweet, 1966
- Genus Renata A. Ruschi, 1946 accepted as Pseudolaelia Porto & Brade, 1935
- Genus Renfadenia J.M.H. Shaw, 2017
- Genus Renorphorchis J.M.H. Shaw, 2014
- Genus Renphalanthe J.M.H. Shaw, 2020
- Genus Renvanvanda J.M.H. Shaw, 2013
- Genus Renzorchis D.L. Szlachetko & T.S. Olszewski, 1998
- Genus Restrepia Kunth in Humboldt, Bonpland & Kunth, 1816
- Genus Restrepiella Garay & Dunsterville in Dunsterville & Garay, 1966
- Genus Restrepiopsis C.A. Luer, 1978
- Genus Reymondia G.K.W.H. Karsten ex C.E.O. Kuntze, 1804 accepted as Myoxanthus Poeppig & Endlicher, 1836
- Genus Rhaesteria V.S. Summerhayes, 1966
- Genus Rhamphidia (Lindley) Lindley, 1857 accepted as Hetaeria Blume, 1825
- Genus Rhamphorhynchus L.A. Garay, 1977
- Genus Rhaphidorhynchus Finet, 1907 accepted as Microcoelia J. Lindley, 1830
- Genus Rhetinantha M.A. Blanco, 2007
- Genus Rhinerrhiza H.M.R. Rupp, 1951
- Genus Rhinerrhizochilus J.M.H. Shaw, 2010
- Genus Rhinerrhizopsis P. Ormerod, 2001
- Genus Rhinocerotidium D.L. Szlachetko, 2006 accepted as Gomesa R. Brown in J. Sims, 1815
- Genus Rhinochilus Hort., 1972
- Genus Rhinorchis D.L. Szlachetko, 2012 accepted as Habenaria Willdenow, 1805
- Genus Rhipidacidium J.M.H. Shaw, 2019
- Genus Rhipidangis J.M.H. Shaw, 2009
- Genus Rhipidoglossum Schlechter, 1918 accepted as Diaphananthe Schlechter, 1914
- Genus Rhizanthella R.S. Rogers, 1928
- Genus Rhizanthera P.F. Hunt & V.S. Summerhayes, 1965
- Genus Rhizocorallon Gagnebin, 1755
- Genus Rhizonium Corda, 1845 †
- Genus Rhomboda Lindley, 1857
- Genus Rhycopelia H. Griffits & J.M.H. Shaw, 2007
- Genus Rhyleyaopsis H. Griffits & J.M.H. Shaw, 2007
- Genus Rhynaelionitis J.M.H. Shaw, 2007
- Genus Rhynarthroleya J.M.H. Shaw, 2007
- Genus Rhynarthron J.M.H. Shaw, 2003
- Genus Rhynburgkia J.M.H. Shaw, 2003
- Genus Rhyncada J.M.H. Shaw, 2004
- Genus Rhyncadamesa J.M.H. Shaw, 2010
- Genus Rhyncanthe J.M.H. Shaw, 2003
- Genus Rhyncatclia H. Griffits & J.M.H. Shaw, 2007
- Genus Rhyncatdendrum J.M.H. Shaw, 2007
- Genus Rhyncatlaelia J.M.H. Shaw, 2007
- Genus Rhyncattleanthe J.M.H. Shaw, 2007
- Genus Rhynchadenia A. Richard in Sagra, 1850 accepted as Macradenia R. Brown, 1822
- Genus Rhynchamsia J.M.H. Shaw, 2009
- Genus Rhynchandra H.G.L. Reichenbach, 1841 accepted as Corymborkis Du Petit-Thouars, 1809
- Genus Rhynchanthe J.M.H. Shaw, 2013
- Genus Rhynchavolarum H. Griffits & J.M.H. Shaw, 2007
- Genus Rhynchawidium J.M.H. Shaw, 2009
- Genus Rhynchobrassoleya J.M.H. Shaw, 2007
- Genus Rhynchocentrum Hort., 1963
- Genus Rhynchochile J.M.H. Shaw, 2013
- Genus Rhynchochilopsis J.M.H. Shaw, 2011
- Genus Rhynchochilus J.M.H. Shaw, 2010
- Genus Rhynchodendrum J.M.H. Shaw, 2003
- Genus Rhynchodenia J.M.H. Shaw, 2003
- Genus Rhynchodenitis H. Griffits & J.M.H. Shaw, 2007
- Genus Rhynchodirea J.M.H. Shaw, 2003
- Genus Rhynchofadanda J.M.H. Shaw, 2004
- Genus Rhynchoguarlia J.M.H. Shaw, 2007
- Genus Rhynchogyna Seidenfaden & Garay in Seidenfaden, 1973
- Genus Rhyncholabium J.M.H. Shaw, 2014
- Genus Rhyncholaelia Schlechter, 1918
- Genus Rhyncholaeliocattleya
- Genus Rhynchomesidium J.M.H. Shaw, 2010
- Genus Rhynchomyrmeleya J.M.H. Shaw, 2009
- Genus Rhynchonia J.M.H. Shaw, 2004
- Genus Rhynchonopsis Hort., 1965
- Genus Rhynchopapilisia L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Rhynchopera Klotzsch in Link et al., 1844 accepted as Pleurothallis R. Brown in W.T. Aiton, 1813
- Genus Rhynchophreatia Schlechter, 1921
- Genus Rhynchopsirea J.M.H. Shaw, 2003
- Genus Rhynchopsis J.M.H. Shaw, 2009
- Genus Rhynchopsyleya J.M.H. Shaw, 2009
- Genus Rhynchorettia J.M.H. Shaw, 2010
- Genus Rhynchorides Hort., 1962
- Genus Rhynchosophrocattleya J.M.H. Shaw, 2007
- Genus Rhynchostele H.G. Reichenbach, 1852 accepted as Lemboglossum F. Halbinger, 1984
- Genus Rhynchostylis Blume, 1825
- Genus Rhynchothechea J.M.H. Shaw, 2007
- Genus Rhynchothechlia J.M.H. Shaw, 2008
- Genus Rhynchotherianda M. Chanyangam, 2022
- Genus Rhynchovanda
- Genus Rhynchovandanthe L.A. Garay & H.R. Sweet, 1966
- Genus Rhynchovolaelia J.M.H. Shaw, 2011
- Genus Rhynchovolanthe J.M.H. Shaw, 2007
- Genus Rhynchovolitis J.M.H. Shaw, 2007
- Genus Rhynchumnia
- Genus Rhyncidlioda J.M.H. Shaw, 2011
- Genus Rhyncleiserides J.M.H. Shaw, 2010
- Genus Rhyncovanda Hort., 1958
- Genus Rhyncyclia J.M.H. Shaw, 2005
- Genus Rhyncyclia J.M.H. Shaw, 2004 accepted as Rhyncyclia J.M.H. Shaw, 2005
- Genus Rhyndenlia H. Griffits & J.M.H. Shaw, 2007
- Genus Rhyndiranda J.M.H. Shaw, 2004
- Genus Rhyndoropsis Hort., 1966
- Genus Rhynitanthe J.M.H. Shaw, 2003
- Genus Rhynitis J.M.H. Shaw, 2003
- Genus Rhynochlioglossum J.M.H. Shaw, 2005
- Genus Rhynopsirea J.M.H. Shaw, 2003
- Genus Rhynphalandopsis J.M.H. Shaw, 2013
- Genus Rhyntheconitis J.M.H. Shaw, 2008
- Genus Rhyntonleya J.M.H. Shaw, 2008
- Genus Rhyntonossum J.M.H. Shaw, 2004
- Genus Rhyntotes J.M.H. Shaw, 2024
- Genus Rhynvandopsis J.M.H. Shaw, 2013
- Genus Rhytionanthos L.A. Garay, F. Hamer & E.S. Siegerist, 1994
- Genus Rhytoniglossum J.M.H. Shaw, 2005
- Genus Rhytoniglossum J.M.H. Shaw, 2004 accepted as Rhytoniglossum J.M.H. Shaw, 2005
- Genus Richardara J.M.H. Shaw, 2011
- Genus Richardmizutaara Hort., 1979
- Genus Richardsonara Hort., 1982
- Genus Ridleya (J.D. Hooker) Pfitzer in Engler & Prantl, 1900 accepted as Thrixspermum Loureiro, 1790
- Genus Ridleyara Hort., 1957
- Genus Ridleyella Schlechter, 1913
- Genus Rimacola H.M.R. Rupp, 1942
- Genus Risleya G. King & Pantling, 1898
- Genus Ritaia G. King & Pantling, 1898 accepted as Ceratostylis Blume, 1825
- Genus Robertmarshara R. Marsh, 2023
- Genus Robertrolfeara J.M.H. Shaw, 2013
- Genus Robertsara J.M.H. Shaw, 2009
- Genus Robicentrum L. Glicenstein, 2012
- Genus Robifinetia Hort., 1983
- Genus Robinara Hort., 1972
- Genus Robinstevensara G. Black & J.M.H. Shaw, 2004
- Genus Robiquetia Gaudichaud-Beaupré in Freycinet, 1829
- Genus Robiquostoma M. Chanyangam, 2021
- Genus Robostylis Hort., 1995
- Genus Roccaforteara Hort., 1993
- Genus Rodrassia Hort., 1960
- Genus Rodrettia Hort., 1958
- Genus Rodrettia R.P. Sauleda, 2015 accepted as Rodrettia Hort., 1958
- Genus Rodrettiopsis Hort., 1976
- Genus Rodrichilus Hort., 1985
- Genus Rodricidium Hort., 1957
- Genus Rodridenia Hort., 1962
- Genus Rodriglossum Hort., 1973
- Genus Rodrigoa L.A. Braas, 1979 accepted as Masdevallia Ruiz & Pavon, 1794
- Genus Rodriguesia A.T. Brongniart, 1843 accepted as Rodriguezia Ruiz & Pavon, 1794
- Genus Rodriguezia Ruiz & Pavon, 1794
- Genus Rodrigueziella O. Kuntze, 1891
- Genus Rodrigueziopsis Schlechter, 1920
- Genus Rodrimesastele J.M.H. Shaw, 2011
- Genus Rodriopsis W. Osment, 1969
- Genus Rodritonia Hort., 1959
- Genus Rodroncidilum J.M.H. Shaw, 2009
- Genus Rodrostele L. Glicenstein, 2009
- Genus Rodrostelettia J.M.H. Shaw, 2011
- Genus Rodrostelidium J.M.H. Shaw, 2011
- Genus Rodrumnia J.M.H. Shaw, 2004 accepted as Rodrumnia J.M.H. Shaw, 2005
- Genus Rodrumnia J.M.H. Shaw, 2005
- Genus Roeblingara J.M.H. Shaw, 2007
- Genus Roellkeara J.M.H. Shaw, 2003
- Genus Roeperocharis H.G. Reichenbach, 1881
- Genus Roezliella Schlechter, 1918 accepted as Sigmatostalix H.G. Reichenbach, 1852
- Genus Rogersonara H. Griffits & J.M.H. Shaw, 2007
- Genus Rohrlara Hort., 1997
- Genus Rolfea Zahlbruckner, 1898 accepted as Palmorchis Barbosa Rodrigues, 1877
- Genus Rolfeara Hort., 1919
- Genus Rolfeela Schlechter, 1924 accepted as Rolfeella Schlechter, 1924
- Genus Rolfeella Schlechter, 1924 accepted as Benthamia A. Richard, 1828
- Genus Rollissonara J.M.H. Shaw, 2007
- Genus Rongwuara C.C. Tsai, 2015
- Genus Ronmaunderara R. Maunder, 2005
- Genus Ronnyara Hort., 1984
- Genus Rophostemon S.F.L. Endlicher, 1837 accepted as Nervilia Commerson ex Gaudichaud-Beaupré in Freycinet, 1829
- Genus Roptrostemon Blume, 1828 accepted as Nervilia Commerson ex Gaudichaud-Beaupré in Freycinet, 1829
- Genus Rosakirschara Hort., 1972
- Genus Roseara Hort., 1979
- Genus Rosscyrtodium J.M.H. Shaw, 2012
- Genus Rossiochopsis J.M.H. Shaw, 2010
- Genus Rossioglossum (Schlechter) Garay & Kennedy, 1976
- Genus Rossiostele J.M.H. Shaw, 2009
- Genus Rossotoglossum L. Glicenstein, 2013
- Genus Rosstuckerara J.M.H. Shaw, 2011
- Genus Rothara Hort., 1970
- Genus Rothschildara J.M.H. Shaw, 2008
- Genus Rothwellara J.M.H. Shaw, 2007
- Genus Rotorara Hort., 1989
- Genus Rubenara J.M.H. Shaw, 2012
- Genus Rudolfangraecum D.L. Szlachetko, J. Mytnik-Ejsmont & E. Grochocka, 2013 accepted as Angraecum Bory de St.-Vincent, 1804
- Genus Rudolfiella Hoehne, 1944 accepted as Bifrenaria J. Lindley, 1832
- Genus Ruizara J.M.H. Shaw, 2004 accepted as Ruizara J.M.H. Shaw, 2005
- Genus Ruizara J.M.H. Shaw, 2005
- Genus Rumrillara L.A. Garay, 1972
- Genus Rumrillara Hort., 1969
- Genus Rundleara J.M.H. Shaw, 2002
- Genus Ruppara Hort., 1999
- Genus Rusbyella Rolfe in H.H. Rusby, 1896
- Genus Russellara J. Creeggan, 2013
- Genus Ryanara J.M.H. Shaw, 2022
- Genus Rydbergara J.M.H. Shaw, 2011
- Genus Rynchanthera Blume, 1825 accepted as Corymborkis Du Petit-Thouars, 1809
- Genus Rynchostylis Blume, 1825
- Genus Saccanthera Hort., 1961
- Genus Saccidium Lindley, 1835 accepted as Holothrix L.C. Richard ex J. Lindley, 1835
- Genus Saccochilus Blume, 1828 accepted as Thrixspermum Loureiro, 1790
- Genus Saccoglossum Schlechter, 1912
- Genus Saccolabiopsis J.J. Smith, 1918
- Genus Saccolabium Blume, 1825
- Genus Saccovanda Hort., 1959 accepted as Rhinochilus Hort., 1972
- Genus Sacodon Rafinesque, 1838 accepted as Cypripedium Linnaeus, 1753
- Genus Sacoila Rafinesque, 1837
- Genus Sadokum D. Tiu & J.E. Cootes, 2007 accepted as Grammatophyllum Blume, 1825
- Genus Sagarikara Hort., 1975
- Genus Sakabaara Hort., 2000
- Genus Salacistis H.G. Reichenbach, 1856
- Genus Sallyyeeara Hort., 1994
- Genus Salpistele R.L. Dressler, 1979
- Genus Samarorchis P. Ormerod, 2008
- Genus Sanda Hort., 1955
- Genus Sanderara Hort., 1937
- Genus Sanderella O. Kuntze, 1891
- Genus Sanjumeara Hort., 1988
- Genus Sansonia G.R. Chiron, 2012
- Genus Santanderella P. Ortiz, 2011 accepted as Notyliopsis P. Ortiz, 1996
- Genus Santotomasia P. Ormerod, 2008
- Genus Saplalaara Hort., 1994
- Genus Sappanara Hort., 1965
- Genus Sarcadenia H.G. Reichenbach in G.W. Schiller, 1857
- Genus Sarcalaenopsis L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Sarcandides J.M.H. Shaw, 2013
- Genus Sarcanthopsis Garay, 1972
- Genus Sarcanthus J. Lindley, 1824 accepted as Acampe Lindley, 1853
- Genus Sarcanthus Lindley, 1826 accepted as Cleisostoma Blume, 1825
- Genus Sarcobodium Beer, 1854 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Sarcocadetia (F.R.R. Schlechter) M.A. Clements & D.L. Jones, 2002 accepted as Cadetia Gaudichaud-Beaupré in Freycinet, 1829
- Genus Sarcocentrum Hort., 1971
- Genus Sarcoceras L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Sarcochilanthe J.M.H. Shaw, 2013
- Genus Sarcochilus R. Brown, 1810
- Genus Sarcodirea L. Glicenstein, 2011
- Genus Sarcoglossum J.G. Beer, 1854 accepted as Cirrhaea Lindley, 1832
- Genus Sarcoglottis K.B. Presl, 1827
- Genus Sarcoglyphis Garay, 1972
- Genus Sarcomoanthus Hort., 1992
- Genus Sarconopsis Hort., 1971
- Genus Sarcopapilionanda L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Sarcophyton Garay, 1972
- Genus Sarcopodium Lindley & Paxton, 1850 accepted as Epigeneium Gagnepain, 1932
- Genus Sarcorhiza Hort., 1966
- Genus Sarcorhynchus Schlechter, 1918 accepted as Diaphananthe Schlechter, 1914
- Genus Sarcoschistotylus J.M.H. Shaw, 2010
- Genus Sarcostachys L. Glicenstein, 2009
- Genus Sarcostoma Blume, 1825
- Genus Sarcothera Hort., 1954
- Genus Sarcovanda Hort., 1971
- Genus Saridestylis Hort., 1977
- Genus Sarmenticola K. Senghas & L.A. Garay, 1996
- Genus Sarothrochilus R. Schlechter, 1906 accepted as Staurochilus Ridley ex Pfitzer in Engler & Prantl, 1900
- Genus Sarpariza Hort., 1999
- Genus Sarracenella C.A. Luer, 1981 accepted as Pleurothallis R. Brown in W.T. Aiton, 1813
- Genus Sartylis Hort., 1973
- Genus Sarvandopanthera J.M.H. Shaw, 2004
- Genus Sarvandopsis J.M.H. Shaw, 2004
- Genus Satorkis Du Petit-Thouars, 1809 accepted as Dactylorhiza Necker ex Nevski, 1937
- Genus Satyridium Lindley, 1838 accepted as Satyrium O. Swartz, 1800
- Genus Satyrium O. Swartz, 1800
- Genus Satyrium Linnaeus, 1753
- Genus Sauledaara Hort., 1980
- Genus Saundersia H.G. Reichenbach, 1866
- Genus Sauroglossum J. Lindley, 1833
- Genus Saurolophorkis H.B. Margońska & D.L. Szlachetko, 2001
- Genus Sauvetrea D.L. Szlachetko, 2006
- Genus Savageara J.M.H. Shaw, 2005
- Genus Savageara J.M.H. Shaw, 2004 accepted as Savageara J.M.H. Shaw, 2005
- Genus Sayeria Kraenzlin, 1894 accepted as Dendrobium O. Swartz, 1799
- Genus Scaphingoa J.M.H. Shaw, 2008
- Genus Scaphosepalum Pfitzer in Engler & Prantl, 1888
- Genus Scaphyglottis Poeppig & Endlicher, 1836
- Genus Scaphyvola J.M.H. Shaw, 2021
- Genus Scaredederis L.M.A.A. Du Petit-Thouars, 1822 accepted as Dendrobium O. Swartz, 1799
- Genus Scelcidumnia J.M.H. Shaw, 2005
- Genus Scelcidumnia J.M.H. Shaw, 2004 accepted as Scelcidumnia J.M.H. Shaw, 2005
- Genus Scelochiloides C.H. Dodson & M.W. Chase, 1989
- Genus Scelochilopsis C.H. Dodson & M.W. Chase, 1998
- Genus Scelochilus Klotzsch, 1841
- Genus Scelodium J.M.H. Shaw, 2002
- Genus Sceloglossum J.M.H. Shaw, 2005
- Genus Sceloglossum J.M.H. Shaw, 2004 accepted as Sceloglossum J.M.H. Shaw, 2005
- Genus Scelonia J.M.H. Shaw, 2005
- Genus Scelonia J.M.H. Shaw, 2004 accepted as Scelonia J.M.H. Shaw, 2005
- Genus Scelorettia Staal & J.M.H. Shaw, 2002
- Genus Schaenomorphus Thorel ex F. Gagnepain, 1933 accepted as Tropidia J. Lindley, 1833
- Genus Schafferara Hort., 1976
- Genus Scheidweilerara J.M.H. Shaw, 2008
- Genus Schidorhynchos D.L. Szlachetko, 1993
- Genus Schiedeela accepted as Schiedeella Schlechter, 1920
- Genus Schiedeella Schlechter, 1920
- Genus Schilligerara Hort., 1999
- Genus Schismoceras K.B. Presl, 1827 accepted as Dendrobium O. Swartz, 1799
- Genus Schistotylus A.W. Dockrill, 1967
- Genus Schizochilus Sonder, 1846
- Genus Schizodium Lindley, 1838
- Genus Schizopedium R.A. Salisbury, 1814 accepted as Cypripedium Linnaeus, 1753
- Genus Schlechterara L.A. Garay & H.R. Sweet, 1966
- Genus Schlechterella F.C. Hoehne, 1944 accepted as Rudolfiella Hoehne, 1944
- Genus Schlechterorchis D.L. Szlachetko, 2003
- Genus Schlimmia Planchon & Linden in Linden, 1852
- Genus Schloatara J.M.H. Shaw, 2007
- Genus Schoenleinia J.F. Klotzsch ex J. Lindley, 1847 accepted as Ponthieva R. Brown in W.T. Aiton, 1813
- Genus Schoenomorphus C. Thorel ex F. Gagnepain, 1933 accepted as Tropidia J. Lindley, 1833
- Genus Schoenorchis Blume, 1825
- Genus Schombarthron Z.-H. Feng & J.M.H. Shaw, 2022
- Genus Schombavola Hort., 1964
- Genus Schombobrassavola W.W.G. Moir, 1957
- Genus Schombocatonia Hort., 1980
- Genus Schombocattleya Hort., 1905
- Genus Schombocyclia J.M.H. Shaw, 2004
- Genus Schombodiacrium Hort., 1958
- Genus Schomboepidendrum Hort., 1957
- Genus Schombolaelia Hort., 1913
- Genus Schombolaeliocattleya Hort., 1951
- Genus Schombolaeliopsis Hort., 1996
- Genus Schombonia Hort., 1962
- Genus Schombonitis Hort., 1920
- Genus Schombotonia W.W.G. Moir, 1957
- Genus Schomburgkia Lindley, 1838
- Genus Schomburgkiocattleya Hort., 1903
- Genus Schomburgkio-Cattleya Hort., 1903 accepted as Schomburgkiocattleya Hort., 1903
- Genus Schomcatanthe J.M.H. Shaw, 2017
- Genus Schomcattleya Hort., 1905 accepted as Schomburgkiocattleya Hort., 1903
- Genus Schom-Cattleya Hort., 1905 accepted as Schomburgkiocattleya Hort., 1903
- Genus Schomcaulaelia J.M.H. Shaw, 2017
- Genus Schomcaulattleya J.M.H. Shaw, 2017
- Genus Schomechea J.M.H. Shaw, 2004
- Genus Schomkeria J.M.H. Shaw, 2017
- Genus Schomleycyclia Z.-H. Feng & J.M.H. Shaw, 2022
- Genus Schomrhyncattleya J.M.H. Shaw, 2017
- Genus Schoriara J.M.H. Shaw, 2024
- Genus Schuitemania P. Ormerod, 2002
- Genus Schunkea K. Senghas, 1994
- Genus Schunkeara J.M.H. Shaw, 2011
- Genus Schwartzkopffia Kraenzlin, 1900 accepted as Brachycorythis J. Lindley, 1838
- Genus Schweinfurthara J.M.H. Shaw, 2002
- Genus Scleropteris Scheidweiler, 1839 accepted as Cirrhaea Lindley, 1832
- Genus Scleropterys Scheidweiler accepted as Scleropteris Scheidweiler, 1839
- Genus Scoliochilus H.G. Reichenbach, 1872 accepted as Appendicula Blume, 1825
- Genus Scolnikara J.M.H. Shaw, 2011
- Genus Scolopendrogyne D.L. Szlachetko & J. Mytnik-Ejsmont, 2009 accepted as Quekettia J. Lindley, 1839
- Genus Scopularia Lindley, 1834 accepted as Holothrix L.C. Richard ex J. Lindley, 1835
- Genus Scottara Hort., 1982
- Genus Scullyara Hort. ex L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Scuticaria Lindley, 1843 accepted as Bifrenaria J. Lindley, 1832
- Genus Seahexa Hort., 1983
- Genus Sealara L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Sedenara J.M.H. Shaw, 2011
- Genus Sedirea Garay & Sweet, 1974
- Genus Sedirisia J.M.H. Shaw, 2003
- Genus Sediritinopsis J.M.H. Shaw, 2009
- Genus Sediropsis J.M.H. Shaw, 2003
- Genus Seegerara H. Griffits & J.M.H. Shaw, 2007
- Genus Seegeriella K. Senghas, 1997
- Genus Segerara Hort., 1994
- Genus Seibertara J.M.H. Shaw, 2011
- Genus Seidenanda J.M.H. Shaw, 2003
- Genus Seidenanthe J.M.H. Shaw, 2018
- Genus Seidenfadenara J.M.H. Shaw, 2011
- Genus Seidenfadenia Garay, 1972
- Genus Seidenfadeniella C.S. Kumar, 1994
- Genus Seidenfia D.L. Szlachetko, 1995
- Genus Seidenides J.M.H. Shaw, 2003
- Genus Seidenluisia J.-P. Ecoffey, 2018
- Genus Seidenluistylis M. Chanyangam, 2018
- Genus Selbyana F. Archila, 2010 accepted as Lycaste Lindley, 1843
- Genus Selenipedium H.G. Reichenbach, 1854
- Genus Selenocypripedium Hort., 1912
- Genus Semiphajus Gagnepain, 1932 accepted as Eulophia R. Brown, 1821
- Genus Senghasara Hort., 2000
- Genus Senghasiella D.L. Szlachetko, 2001
- Genus Sepalosaccus Schlechter, 1923 accepted as Camaridium J. Lindley, 1824
- Genus Sepalosiphon Schlechter, 1912 accepted as Glomera Blume, 1825
- Genus Seraphrys J.M.H. Shaw, 2004
- Genus Seraphyta F.E.L. Fischer & C.A. Meyer, 1840 accepted as Epidendrum Linnaeus, 1763
- Genus Serapias Linnaeus, 1753
- Genus Serapias Persoon, 1807
- Genus Serapiastrum O. Kuntze, 1898 accepted as Serapias Linnaeus, 1753
- Genus Serapicamptis Godfery, 1921
- Genus Serapimeulenia P. Delforge, 2009 accepted as Serapicamptis Godfery, 1921
- Genus Serapirhiza Potucek, 1968
- Genus Sergioara J.M.H. Shaw, 2011
- Genus Serpenticaulis M.A. Clements & D.L. Jones, 2002 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Serrastylis Rolfe, 1894 accepted as Macradenia R. Brown, 1822
- Genus Sertifera Lindley & H.G. Reichenbach in H.G. Reichenbach, 1876
- Genus Sessilibulbum F.G. Brieger in F.G. Brieger et al., 1976 accepted as Scaphyglottis Poeppig & Endlicher, 1836
- Genus Sestochilos Breda, 1828 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Severinara Hort., 1981
- Genus Sheehanara Hort., 1996
- Genus Sherriffara J.M.H. Shaw, 2011
- Genus Shigeuraara Hort., 1969
- Genus Shipmanara Hort., 1963
- Genus Shiveara Hort., 1991
- Genus Shizhenia X.H. Jin, L.Q. Huang, W.T. Jin & X.G. Xiang, 2015
- Genus Siagonanthus Poeppig & Endlicher, 1836 accepted as Ornithidium R. Brown in W.T. Aiton, 1813
- Genus Sidranara Hort., 1986
- Genus Sieberia K.P.J. Sprengel, 1817 accepted as Platanthera L.C. Richard, 1817
- Genus Siederella D.L. Szlachetko, J. Mytnik-Ejsmont, M. Górniak & A. Romowicz, 2006 accepted as Cyrtochilum Kunth in Humboldt, Bonpland & Kunth, 1816
- Genus Siegeristara Hort., 1996
- Genus Sievekingia H.G. Reichenbach, 1871
- Genus Sigmacidium Hort., 1998
- Genus Sigmatochilus Rolfe, 1914 accepted as Chelonistele Pfitzer in Engler, 1907
- Genus Sigmatogyne Pfitzer in Pfitzer & Kränzlin in Engler, 1907
- Genus Sigmatostalix H.G. Reichenbach, 1852
- Genus Sigmettia J.M.H. Shaw, 2010
- Genus Silpaprasertara Hort., 1982
- Genus Silvalismis L.M.A. du P. Thouars accepted as Calanthe R. Brown, 1821
- Genus Silvorchis J.J. Smith, 1907
- Genus Simpliglottis D.L. Szlachetko, 2001 accepted as Chiloglottis R. Brown, 1810
- Genus Singchia Z.J. Liu & L.J. Chen, 2009
- Genus Sinorchis S.C. Chen, 1978 accepted as Cephalanthera L.C. Richard, 1817
- Genus Sirhookera O. Kuntze, 1891
- Genus Sirindhornia H.A. Pedersen & P. Suksathan, 2003
- Genus Sirjeremiahara J.M.H. Shaw, 2010
- Genus Skeptrostachys L.A. Garay, 1982
- Genus Sladeara Hort., 1982
- Genus Smallia Nieuwland, 1913 accepted as Pteroglossaspis H.G. Reichenbach, 1878
- Genus Smithara L.A. Garay, 1972
- Genus Smithara L.A. Garay & H.R. Sweet, 1966
- Genus Smithorchis Tang & Wang, 1936
- Genus Smithsonia C.J. Saldanha, 1974
- Genus Smitinandia Holttum, 1969
- Genus Sobennigraecum Hort., 1986
- Genus Sobennikoffia Schlechter, 1925
- Genus Sobradina P.J. Spence & J.M.H. Shaw, 2024
- Genus Sobralia Ruiz & Pavon, 1794
- Genus Sobratilla C.G. Wilson, 2016
- Genus Sobrinoara J.M.H. Shaw, 2007
- Genus Sodiroella Schlechter, 1921 accepted as Stellilabium Schlechter, 1914
- Genus Solanderara J.M.H. Shaw, 2004 accepted as Solanderara J.M.H. Shaw, 2005
- Genus Solanderara J.M.H. Shaw, 2005
- Genus Solenangis Schlechter, 1918
- Genus Solenidiopsis K. Senghas, 1986
- Genus Solenidium Lindley, 1846
- Genus Solenioda R.A. Culver, 2024
- Genus Solenocentrum Schlechter, 1911
- Genus Solenoncidium J.M.H. Shaw, 2023
- Genus Sophcychea H. Griffits & J.M.H. Shaw, 2007
- Genus Sophleyclia J.M.H. Shaw, 2007
- Genus Sophranthe J.M.H. Shaw, 2003
- Genus Sophrobroanthe J.M.H. Shaw, 2007
- Genus Sophrobroughtonia W.W.G. Moir, 1957
- Genus Sophrocatarthron J.M.H. Shaw, 2007
- Genus Sophrocatcattleya J.M.H. Shaw, 2007
- Genus Sophrocatlaelia Argus, 1900 accepted as Sophrolaeliocattleya Hort., 1898
- Genus Sophrocattleya Rolfe, 1887
- Genus Sophrogoa J.M.H. Shaw, 2007
- Genus Sophrolaelia Hort., 1894
- Genus Sophrolaeliocattleya Hort., 1898
- Genus Sophrolaeliocyclia Z.-H. Feng & J.M.H. Shaw, 2022
- Genus Sophronia Lindley, 1828 accepted as Sophronitis J. Lindley, 1828
- Genus Sophronitella R. Schlechter, 1925 accepted as Isabelia Barbosa Rodrigues, 1877
- Genus Sophronitis J. Lindley, 1828
- Genus Sophroprosleya J.M.H. Shaw, 2007
- Genus Sophrotheanthe J.M.H. Shaw, 2007
- Genus Sophrothechea J.M.H. Shaw, 2007
- Genus Sophrovola G. Hansen, 1895
- Genus Soterocycnis J.M.H. Shaw, 2023
- Genus Soterosanthus Lehmann ex R. Jenny, 1986
- Genus Sotoa G.A. Salazar, 2010
- Genus Spathiger J.K. Small, 1913 accepted as Epidendrum Linnaeus, 1763
- Genus Spathocalanthe Hort., 1898
- Genus Spathocalanthe J.J. Linden ex Z.-H. Feng & J.M.H. Shaw, 2022
- Genus Spathoglottis Blume, 1825
- Genus Spathophaius A.D. Hawkes, 1959
- Genus Specklinia Lindley, 1830 accepted as Pleurothallis R. Brown in W.T. Aiton, 1813
- Genus Sphyrarhynchus Mansfeld, 1935
- Genus Sphyrastylis Schlechter, 1920
- Genus Spiculaea Lindley, 1840
- Genus Spiessara J.M.H. Shaw, 2003
- Genus Spilorchis D.L. Jones & M.A. Clements, 2005 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Spilorhiza
- Genus Spiranthes L.C. Richard, 1817
- Genus Spongiola J.J. Wood & A.L. Lamb, 1994
- Genus Spruceara J.M.H. Shaw, 2005
- Genus Spruceara J.M.H. Shaw, 2004 accepted as Spruceara J.M.H. Shaw, 2005
- Genus Spuricianthus D.L. Szlachetko & H.B. Margonska, 2001 accepted as Acianthus R. Brown, 1810
- Genus Srisukara Hort., 1995
- Genus Staalara Hort., 1985
- Genus Stacyara Hort., 1973
- Genus Stacyella D.L. Szlachetko, 2006 accepted as Erycina Lindley, 1853
- Genus Staffordara G. Monnier & J.M.H. Shaw, 2004
- Genus Stalkya L.A. Garay, 1982
- Genus Stamariaara Hort., 1974
- Genus Stamnorchis D.L. Jones & M.A. Clements, 2002 accepted as Pterostylis R. Brown, 1810
- Genus Stanfieldara Hort., 1969
- Genus Stangora Hort., 1984
- Genus Stanhocycnis Hort., 1983
- Genus Stanhopea Frost ex W.J. Hooker, 1829
- Genus Stanhopeastrum H.G. Reichenbach, 1852 accepted as Stanhopea Frost ex W.J. Hooker, 1829
- Genus Stanmanneta J.M.H. Shaw, 2023
- Genus Statterara J.M.H. Shaw, 2008
- Genus Staurachnanthera J.M.H. Shaw, 2010
- Genus Staurachnis Hort., 1950
- Genus Stauranda A.D. Hawkes, 1952
- Genus Staurandopsis J.M.H. Shaw, 2010
- Genus Staurites H.G.L. Reichenbach accepted as Stauritis H.G.L. Reichenbach, 1862
- Genus Stauritis H.G.L. Reichenbach, 1862 accepted as Phalaenopsis Blume, 1825
- Genus Staurochilus Ridley ex Pfitzer in Engler & Prantl, 1900
- Genus Staurochoglottis J.M.H. Shaw, 2010
- Genus Stauroglottis Schauer, 1843 accepted as Phalaenopsis Blume, 1825
- Genus Stauropsis H.G. Reichenbach, 1860 accepted as Trichoglottis Blume, 1825
- Genus Staurovanda J.M.H. Shaw, 2010
- Genus Stearnara J.M.H. Shaw, 2002
- Genus Stegostyla D.L. Jones & M.A. Clements in D.L. Jones, M.A. Clements, I.K. Sharma & A.M. Mackenzie, 2001 accepted as Caladenia R. Brown, 1810
- Genus Stelbophyllum M.A. Clements & D.L. Jones, 2002 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Steliopsis F.G. Brieger in F.G. Brieger et al., 1976 accepted as Stelis O. Swartz, 1800
- Genus Stelis O. Swartz, 1800
- Genus Stellamaris M. Fernández & D. Bogarín in Bogarín et al., 2018
- Genus Stellamizutaara Hort., 1983
- Genus Stellilabium Schlechter, 1914
- Genus Stellipogon J.M.H. Shaw, 2003
- Genus Stellorchis L.M.A. du P. Thouars accepted as Nervilia Commerson ex Gaudichaud-Beaupré in Freycinet, 1829
- Genus Stellorkis Du Petit-Thouars, 1809 accepted as Nervilia Commerson ex Gaudichaud-Beaupré in Freycinet, 1829
- Genus Stenanthus K.J. Lönnroth, 1882
- Genus Stenia J. Lindley, 1837
- Genus Steniella Hort., 1998
- Genus Stenizella J.M.H. Shaw, 2010
- Genus Stenobolusia J.M.H. Shaw, 2008
- Genus Stenocoryne Lindley, 1843 accepted as Bifrenaria J. Lindley, 1832
- Genus Stenodenella L. Glicenstein, 2009
- Genus Stenoglossum Kunth in Humboldt, Bonpland & Kunth, 1816 accepted as Epidendrum Linnaeus, 1763
- Genus Stenoglottis Lindley in W.J. Hooker, 1837
- Genus Stenopetella J.M.H. Shaw, 2010
- Genus Stenoplectris L. Glicenstein, 2019
- Genus Stenopogon L. Glicenstein & J.M.H. Shaw, 2003
- Genus Stenopolen Rafinesque, 1838 accepted as Stenia J. Lindley, 1837
- Genus Stenoptera K.B. Presl, 1827
- Genus Stenorrhynchos L.C. Richard ex K.P.J. Sprengel, 1826
- Genus Stenosarcos Hort., 2001
- Genus Stentleya J.M.H. Shaw, 2020
- Genus Stephanothelys L.A. Garay, 1977
- Genus Stephenara Hort., 2001
- Genus Stephenmonkhouseara S. Monkhouse & J.M.H. Shaw, 2003
- Genus Stereochilus Lindley, 1858
- Genus Stereosandra Blume, 1856
- Genus Stereostylis J.M.H. Shaw, 2017
- Genus Steumpfleara J.M.H. Shaw, 2011
- Genus Steveniella Schlechter, 1918
- Genus Stevenorchis Wankow & Kränzlin, 1931 accepted as Steveniella Schlechter, 1918
- Genus Stewartara Hort., 1984
- Genus Stichorchis Du Petit-Thouars, 1822
- Genus Stichorkis Du Petit-Thouars, 1809 accepted as Liparis L.C. Richard, 1817
- Genus Stictophyllorchis C.H. Dodson & G. Carnevali, 1993
- Genus Stictophyllum C.H. Dodson & M.W. Chase, 1989 accepted as Stictophyllorchis C.H. Dodson & G. Carnevali, 1993
- Genus Stigmatodactylus C.J. Maximowicz ex T. Makino, 1891
- Genus Stigmatorthos M.W. Chase & D.E. Bennett, 1993
- Genus Stigmatosema L.A. Garay, 1982 accepted as Cyclopogon K.B. Presl, 1827
- Genus Stilbophyllum M.A. Clements & D.L. Jones, 2002 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Stimegas Rafinesque, 1838 accepted as Cypripedium Linnaeus, 1753
- Genus Stolzia Schlechter, 1915
- Genus Stormara P.A. Storm, 2010
- Genus Strateuma Rafinesque, 1837 accepted as Zeuxine Lindley, 1826
- Genus Strateuma R.A. Salisbury, 1812 accepted as Orchis Linnaeus, 1753
- Genus Streptogyne (H.G.L. Reichenbach) H.G.L. Reichenbach, 1841 accepted as Dactylorhiza Necker ex Nevski, 1937
- Genus Stricklandara H. Griffits & J.M.H. Shaw, 2007
- Genus Strongyleria (E.H.H. Pfitzer) A. Schuiteman, Y.P. Ng & H.Æ. Pedersen in Ng et al., 2018
- Genus Sturmia H.G.L. Reichenbach, 1826 accepted as Liparis L.C. Richard, 1817
- Genus Styloglossum Breda, 1829 accepted as Calanthe R. Brown, 1821
- Genus Suara J.M.H. Shaw, 2019
- Genus Suarezia C.H. Dodson, 1989
- Genus Sudacaste F. Archila & G.R. Chiron, 2010 accepted as Lycamerlycaste J.M.H. Shaw, 2009
- Genus Sudalycenaria J.M.H. Shaw, 2014
- Genus Sudamerlycaste F. Archila, 2002
- Genus Sudamoorea J.M.H. Shaw, 2020
- Genus Sudamuloa J.M.H. Shaw, 2009
- Genus Sullivania F. von Mueller, 1882
- Genus Sulpitia Rafinesque, 1838 accepted as Encyclia W.J. Hooker, 1828
- Genus Summerangis J.M.H. Shaw, 2004
- Genus Summerhayesia P.J. Cribb, 1977
- Genus Sunipia J. Lindley, 1826
- Genus Susanperreiraara Hort., 2000
- Genus Sutingara Hort., 1984
- Genus Sutrina J. Lindley, 1842
- Genus Suttonara H. Griffits & J.M.H. Shaw, 2007
- Genus Svenkoeltzia P. Burns-Balogh, 1989
- Genus Sweetara G.W. Dillon, 1969
- Genus Sylvalismis Dalla Torre & Harms accepted as Calanthe R. Brown, 1821
- Genus Sylvalismus Post & Kuntze accepted as Calanthe R. Brown, 1821
- Genus Symmonsara Hort., 1997
- Genus Symphodontioda A.D. Hawkes, 1963
- Genus Symphodontoglossum A.D. Hawkes, 1963
- Genus Symphodontonia L.A. Garay & H.R. Sweet, 1966
- Genus Symphyglossonia A.D. Hawkes, 1963
- Genus Symphyglossum Schlechter, 1919
- Genus Symphyosepalum Handel-Mazzetti, 1936
- Genus Synadena Rafinesque, 1838 accepted as Phalaenopsis Blume, 1825
- Genus Synanthes P. Burns-Balogh, H.E. Robinson & M.S. Foster, 1985 accepted as Eurystyles Wawra, 1863
- Genus Synarmosepalum L.A. Garay, F. Hamer & E.S. Siegerist, 1994
- Genus Synassa Lindley, 1833 accepted as Sauroglossum J. Lindley, 1833
- Genus Synmeria Nimmo in J. Graham, 1839
- Genus Synoplectris Rafinesque, 1837 accepted as Sarcoglottis K.B. Presl, 1827
- Genus Synptera Llanos, 1851 accepted as Trichoglottis Blume, 1825
- Genus Systeloglossum Schlechter, 1923
- Genus Taeniochista J.M.H. Shaw, 2015
- Genus Taeniophyllum Blume, 1825
- Genus Taeniorrhiza Summerhayes, 1943
- Genus Tainia Blume, 1825
- Genus Tainiopsis B. Hayata, 1914
- Genus Tainiopsis Schlechter, 1915 accepted as Eriodes Rolfe, 1915
- Genus Takakiara S. Takaki, 2005
- Genus Takasakiara J.F. Jusczak, 2024
- Genus Talpinaria G.K.W.H. Karsten, 1861 accepted as Pleurothallis R. Brown in W.T. Aiton, 1813
- Genus Tamayorkis D.L. Szlachetko, 1995
- Genus Tanakara Hort., 1952 accepted as Phalaerianda Hort., 1951
- Genus Tanakaria Hort., 1952 accepted as Phalaerianda Hort., 1951
- Genus Tanara Hort., 2001
- Genus Tangtsinia S.C. Chen, 1965 accepted as Cephalanthera L.C. Richard, 1817
- Genus Tankervillia Link, 1829 accepted as Phaius Loureiro, 1790
- Genus Tansirara J.M.H. Shaw, 2013
- Genus Tapeinoglossum Schlechter, 1913
- Genus Tapilinopsis J.M.H. Shaw, 2014
- Genus Taprachnis J.M.H. Shaw, 2014
- Genus Taprachthera J.M.H. Shaw, 2014
- Genus Tapranda J.M.H. Shaw, 2014
- Genus Tapranthera J.M.H. Shaw, 2014
- Genus Tapranthopsis J.M.H. Shaw, 2014
- Genus Taprenopsis J.M.H. Shaw, 2014
- Genus Taprenvandopsis J.M.H. Shaw, 2014
- Genus Taproanthe J.M.H. Shaw, 2014
- Genus Taprobanea E.A. Christenson, 1992
- Genus Taproglottis J.M.H. Shaw, 2014
- Genus Tapronopsis J.M.H. Shaw, 2014
- Genus Tapropapilanda J.M.H. Shaw, 2014
- Genus Tapropapilanthera J.M.H. Shaw, 2014
- Genus Taproparanthera J.M.H. Shaw, 2014
- Genus Taprophalanda J.M.H. Shaw, 2014
- Genus Taprotrichothera J.M.H. Shaw, 2014
- Genus Tapvandachnis J.M.H. Shaw, 2014
- Genus Tapvandera J.M.H. Shaw, 2014
- Genus Tateara H. Griffits & J.M.H. Shaw, 2007
- Genus Taurantha D.L. Jones & M.A. Clements, 2002 accepted as Pterostylis R. Brown, 1810
- Genus Taurodium D.L. Jones & M.A. Clements, 2002
- Genus Taurostalix H.G. Reichenbach, 1852 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Teagueia (C.A. Luer) C.A. Luer, 1991
- Genus Telidezia J.M.H. Shaw, 2003
- Genus Telipogon Kunth in Humboldt, Bonpland & Kunth, 1816
- Genus Telisterella J.M.H. Shaw, 2003
- Genus Templeara H. Griffits & J.M.H. Shaw, 2007
- Genus Teohara Hort., 1968
- Genus Tetrabaculum M.A. Clements & D.L. Jones, 2002 accepted as Dendrobium O. Swartz, 1799
- Genus Tetrabroughtanthe J.M.H. Shaw, 2008
- Genus Tetracattleya Hort., 1990
- Genus Tetradiacrium Hort., 1986
- Genus Tetragamestus H.G. Reichenbach, 1854 accepted as Scaphyglottis Poeppig & Endlicher, 1836
- Genus Tetrakeria Hort., 1978
- Genus Tetralaelia Hort., 1902
- Genus Tetra-laelia Hort., 1902 accepted as Tetralaelia Hort., 1902
- Genus Tetraliopsis Hort., 1965
- Genus Tetrallia J.M.H. Shaw, 2003
- Genus Tetramicra J. Lindley, 1831
- Genus Tetrapeltis Wallich ex Lindley, 1832 accepted as Otochilus Lindley, 1830
- Genus Tetrarthron J.M.H. Shaw, 2005
- Genus Tetrasychilis P.A. Storm, 2010
- Genus Tetrathechea J.M.H. Shaw, 2019
- Genus Tetratonia Hort., 1965
- Genus Tetrodon M.A. Clements & D.L. Jones, 1998
- Genus Tetronichilis J.M.H. Shaw, 2008
- Genus Teuscheria Garay, 1958 accepted as Bifrenaria J. Lindley, 1832
- Genus Thaia G. Seidenfaden, 1975
- Genus Thaiara L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Thayerara J.M.H. Shaw, 2007
- Genus Theana L.V. Averyanov, 2012
- Genus Thecopus G. Seidenfaden, 1984
- Genus Thecostele H.G. Reichenbach, 1857
- Genus Thecostelopus J.M.H. Shaw, 2015
- Genus Thelasis Blume, 1825
- Genus Thelybaculum J.M.H. Shaw, 2003
- Genus Thelychiton Endlicher, 1833 accepted as Dendrobium O. Swartz, 1799
- Genus Thelymitra J.R. Forster & J.G.A. Forster, 1775
- Genus Thelypilis J.M.H. Shaw, 2014
- Genus Thelyrillia J.M.H. Shaw, 2003
- Genus Thelyschista L.A. Garay, 1982
- Genus Theodorea Barbosa Rodrigues, 1877 accepted as Rodrigueziella O. Kuntze, 1891
- Genus Thesaera Hort., 1970
- Genus Thicuania Rafinesque, 1838 accepted as Dendrobium O. Swartz, 1799
- Genus Thiebautia Colla, 1824 accepted as Bletia Ruiz & Pavón, 1794
- Genus Thompsonara Hort., 1998
- Genus Thorntonara L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Thorvaldsenia Liebmann ex C.J. Hartman, 1844 accepted as Chysis J. Lindley, 1837
- Genus Thouarsara J.M.H. Shaw, 2011
- Genus Thrixspermum Loureiro, 1790
- Genus Thulinia P.J. Cribb in P.J. Cribb & J. Stewart, 1985
- Genus Thunia H.G. Reichenbach, 1852
- Genus Thuniopsis L. Li, D.P. Ye & S.J. Li, 2015
- Genus Thwaitesara J.M.H. Shaw, 2007
- Genus Thylacis Gagnepain, 1932 accepted as Thrixspermum Loureiro, 1790
- Genus Thysanochilus H. Falconer, 1839 accepted as Eulophia R. Brown, 1821
- Genus Thysanoglossa Porto & Brade, 1940
- Genus Tibbsara M. Tibbs, 2018
- Genus Ticoglossum R. Lucas Rodríguez ex F. Halbinger, 1983
- Genus Tigivesta C.A. Luer, 2007 accepted as Pleurothallis R. Brown in W.T. Aiton, 1813
- Genus Tinea Bivona, 1833 accepted as Neotinea H.G. Reichenbach, 1852
- Genus Tipularia Nuttall, 1818
- Genus Titania Endlicher, 1833 accepted as Oberonia Lindley, 1830
- Genus Todaroa A. Richard & Galeotti, 1845 accepted as Campylocentrum Bentham, 1881
- Genus Toladenia J.M.H. Shaw, 2005
- Genus Toladenia J.M.H. Shaw, 2004 accepted as Toladenia J.M.H. Shaw, 2005
- Genus Tolassia J.M.H. Shaw, 2005
- Genus Tolassia J.M.H. Shaw, 2004 accepted as Tolassia J.M.H. Shaw, 2005
- Genus Tolguezettia J.M.H. Shaw, 2004 accepted as Tolguezettia J.M.H. Shaw, 2005
- Genus Tolguezettia J.M.H. Shaw, 2005
- Genus Toloncettia J.M.H. Shaw, 2004 accepted as Toloncettia J.M.H. Shaw, 2005
- Genus Toloncettia J.M.H. Shaw, 2005
- Genus Toluandra J.M.H. Shaw, 2005
- Genus Toluandra J.M.H. Shaw, 2004 accepted as Toluandra J.M.H. Shaw, 2005
- Genus Tolucentrum J.M.H. Shaw, 2005
- Genus Tolucentrum J.M.H. Shaw, 2004 accepted as Tolucentrum J.M.H. Shaw, 2005
- Genus Toluglossum J.M.H. Shaw, 2005
- Genus Toluglossum J.M.H. Shaw, 2004 accepted as Toluglossum J.M.H. Shaw, 2005
- Genus Tolumnia Rafinesque, 1837
- Genus Tolumnopsis J.M.H. Shaw, 2004 accepted as Tolumnopsis J.M.H. Shaw, 2005
- Genus Tolumnopsis J.M.H. Shaw, 2005
- Genus Tolutonia J.M.H. Shaw, 2005
- Genus Tolutonia J.M.H. Shaw, 2004 accepted as Tolutonia J.M.H. Shaw, 2005
- Genus Tomoderara J.M.H. Shaw, 2003
- Genus Tomotris Rafinesque, 1837 accepted as Corymborkis Du Petit-Thouars, 1809
- Genus Tomzanonia M.A. Nir, 1997
- Genus Townsonia Cheeseman, 1906
- Genus Trachelosiphon Schlechter, 1920 accepted as Eurystyles Wawra, 1863
- Genus Trachoma Garay, 1972 accepted as Tuberolabium Yamamoto, 1924
- Genus Trachypetalum D.L. Szlachetko & M. Sawicka, 2003
- Genus Trachyrhizum (Schlechter) F.G. Brieger in F.G. Brieger et al., 1981 accepted as Dendrobium O. Swartz, 1799
- Genus Traunsteinera H.G.L. Reichenbach, 1842
- Genus Trautara Hort., 1980
- Genus Trevorara Hort., 1963
- Genus Trevoria F.C. Lehmann, 1897
- Genus Treyeranara J.M.H. Shaw, 2007
- Genus Triaristella C.A. Luer, 1978 accepted as Trisetella C.A. Luer, 1980
- Genus Triaristella F.G. Brieger in F.G. Brieger et al., 1975 accepted as Trisetella C.A. Luer, 1980
- Genus Triaristellina S. Rauschert, 1983 accepted as Trisetella C.A. Luer, 1980
- Genus Trias J. Lindley, 1830
- Genus Triaspetalum Hort., 1996
- Genus Triasphyllum Hort., 1996
- Genus Tribrachia Lindley, 1824 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Triceratorhynchus Summerhayes, 1951
- Genus Triceratostris (D.L. Szlachetko) D.L. Szlachetko & R.G. Tamayo, 1996
- Genus Trichachnis A.D. Hawkes, 1957
- Genus Trichassia J.M.H. Shaw, 2004
- Genus Trichocenilus J.M.H. Shaw, 2004
- Genus Trichocensiella J.M.H. Shaw, 2004
- Genus Trichocentrum Poeppig & Endlicher, 1836
- Genus Trichoceros Kunth in Humboldt, Bonpland & Kunth, 1816
- Genus Trichochilus O. Ames, 1932 accepted as Dipodium R. Brown, 1810
- Genus Trichocidiphyllum J.M.H. Shaw, 2011
- Genus Trichocidium Hort., 1955
- Genus Trichocyrtocidium J.M.H. Shaw, 2009
- Genus Trichoglottis Blume, 1825
- Genus Trichononcos M. Chanyangam, 2016
- Genus Trichonopsis Hort., 1976
- Genus Trichopasia W.W.G. Moir, 1957
- Genus Trichopilia Lindley, 1836
- Genus Trichopogon E. Sánchez & J.M.H. Shaw, 2002
- Genus Trichopsis Hort., 1970
- Genus Trichosalpinx C.A. Luer, 1983
- Genus Trichosia C.L. von Blume, 1825 accepted as Eria J. Lindley, 1825
- Genus Trichosma Lindley, 1842 accepted as Eria J. Lindley, 1825
- Genus Trichostylis Hort., 1982
- Genus Trichotheria M. Chanyangam, 2021
- Genus Trichotosia Blume, 1825
- Genus Trichovanda Hort., 1949
- Genus Trichovanvanda J.M.H. Shaw, 2013
- Genus Tricochilus Ames accepted as Dipodium R. Brown, 1810
- Genus Tricyrtochilum J.M.H. Shaw, 2009
- Genus Tridactyle Schlechter, 1914
- Genus Trigolyca Hort., 1988
- Genus Trigonanthe (Schlechter) F.G. Brieger in F.G. Brieger et al., 1975 accepted as Dryadella C.A. Luer, 1978
- Genus Trigonidium J. Lindley, 1837
- Genus Trigonochilum W. Königer & H. Schildhauer, 1994
- Genus Triodoncidium J.M.H. Shaw, 2005
- Genus Triodoncidium J.M.H. Shaw, 2004 accepted as Triodoncidium J.M.H. Shaw, 2005
- Genus Triorchis Millan, 1765 accepted as Spiranthes L.C. Richard, 1817
- Genus Triorchos J.K. Small & Nash ex J.K. Small, 1903 accepted as Pteroglossaspis H.G. Reichenbach, 1878
- Genus Triphora T. Nuttall, 1818
- Genus Tripleura Lindley, 1833 accepted as Zeuxine Lindley, 1826
- Genus Triplorhiza J.K. Ehrhart, 1789 accepted as Pseudorchis Séguier, 1754
- Genus Trisetella C.A. Luer, 1980
- Genus Trisuloara Hort., 1998
- Genus Tritelandra Rafinesque, 1837 accepted as Epidendrum Linnaeus, 1763
- Genus Trizeuxis J. Lindley, 1821
- Genus Trophianthus Scheidweiler, 1844 accepted as Aspasia J. Lindley, 1832
- Genus Tropidia J. Lindley, 1833
- Genus Tropilis Rafinesque, 1837 accepted as Dendrobium O. Swartz, 1799
- Genus Trudelia L.A. Garay, 1986
- Genus Trudelianda L.A. Garay, 1986
- Genus Tryphia Lindley, 1835 accepted as Holothrix L.C. Richard ex J. Lindley, 1835
- Genus Tsaiara C.C. Tsai, 2015
- Genus Tsaiorchis Tang & Wang, 1936 accepted as Diphylax J.D. Hooker, 1889
- Genus Tsiorchis Z.J. Liu, S.C. Chen & L.J. Chen, 2011 accepted as Holcoglossum Schlechter, 1919
- Genus Tsubotaara T. Tsubota, 2007
- Genus Tubaecum Hort., 1979
- Genus Tubella (C.A. Luer) F. Archila, 2009 accepted as Karma A.P. Karremans, 2023
- Genus Tubella F. Archila, 2015 accepted as Tubella (C.A. Luer) F. Archila, 2009
- Genus Tuberolabium Yamamoto, 1924
- Genus Tuberoparaptoceras J.M.H. Shaw, 2010
- Genus Tubilabium J.J. Smith, 1928 accepted as Myrmechis (Lindley) Blume, 1858 (?)
- Genus Tuckerara Hort., 1976
- Genus Tulexis Rafinesque, 1838 accepted as Brassavola R. Brown in W.T. Aiton, 1813
- Genus Tulotis Rafinesque, 1833 (?) accepted as Platanthera L.C. Richard, 1817
- Genus Tunstillara H. Griffits & J.M.H. Shaw, 2007
- Genus Tunstillara J.M.H. Shaw, 2008
- Genus Tupacamaria F. Archila, 2008 accepted as Galeandra Lindley in F.A. Bauer & Lindley, 1832
- Genus Turnbowara Hort., 1991
- Genus Tussaca Rafinesque, 1814 accepted as Goodyera R. Brown in W.T. Aiton, 1813
- Genus Tylochilus C.G.D. Nees, 1832 accepted as Cyrtopodium R. Brown in W.T. Aiton, 1813
- Genus Tylostigma Schlechter, 1916
- Genus Tylostylis Blume, 1828 accepted as Eria J. Lindley, 1825
- Genus Ulantha W.J. Hooker, 1830 accepted as Chloraea J. Lindley, 1827
- Genus Uleiorchis Hoehne, 1944
- Genus Umlandara J.M.H. Shaw & R. Umland, 2003
- Genus Uncifera Lindley, 1858
- Genus Unguiculabia J. Mytnik-Ejsmont & D.L. Szlachetko, 2008 accepted as Polystachya W.J. Hooker, 1824
- Genus Univiscidiatus (P.J. Kores) D.L. Szlachetko, 2001 accepted as Chiloglottis R. Brown, 1810
- Genus Uptonara Hort., 1992
- Genus Urochilus D.L. Jones & M.A. Clements, 2002 accepted as Pterostylis R. Brown, 1810
- Genus Uropedium Lindley, 1846 accepted as Phragmipedium Rolfe, 1896
- Genus Urostachya (Lindley) F.G. Brieger in F.G. Brieger et al., 1981 accepted as Eria J. Lindley, 1825
- Genus Vacherotara Hort., 1995
- Genus Vaginaella G. Vierling, 2018 accepted as Andreettaea C.A. Luer, 1978
- Genus Valdiviesoa D.L. Szlachetko & M. Kolanowska, 2014 accepted as Fernandezia Ruiz & Pavon, 1794
- Genus Valinara J.M.H. Shaw, 2002
- Genus Vampiraea D.L. Szlachetko, 2021
- Genus Vanachnochilus J.M.H. Shaw, 2010
- Genus Vanalstyneara Hort., 1977
- Genus Vananthopsis J.M.H. Shaw, 2004
- Genus Vanascochilus J.M.H. Shaw, 2010
- Genus Vancampe W.W.G. Moir, 1957
- Genus Vanchoanthe J.M.H. Shaw, 2013
- Genus Vanda W. Jones ex R. Brown, 1820
- Genus Vandachnis Hort., 1949
- Genus Vandachostylis A. Guillaumin & Lami, 1935
- Genus Vandacostylis A. Guillaumin & Lami, 1935 accepted as Vandachostylis A. Guillaumin & Lami, 1935
- Genus Vandaecum Hort., 1960
- Genus Vandaenopsis Guillaumin & Lami, 1935
- Genus Vandaeranthes Hort., 1984
- Genus Vandanthe Schlechter, 1919
- Genus Vandantherella L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Vandantherides L.A. Garay & H.R. Sweet, 1966
- Genus Vandarachnis Hort., 1939 accepted as Aranda Hort., 1937
- Genus Vandensonides J.M.H. Shaw, 2008
- Genus Vandewegheara Hort., 1976
- Genus Vandirea J.M.H. Shaw, 2003
- Genus Vandofinetia Hort., 1960
- Genus Vandofinides Hort., 1974
- Genus Vandoglossum L.A. Garay, 1972
- Genus Vandoglottanthe J.M.H. Shaw, 2013
- Genus Vandopirea J.M.H. Shaw, 2003
- Genus Vandopsides McCoy, 1958
- Genus Vandopsis Hort., 1931 accepted as Vandaenopsis Guillaumin & Lami, 1935
- Genus Vandopsis Pfitzer in Engler & Prantl, 1889
- Genus Vandoritis Hort., 1965
- Genus Vanglossum Hort., 1969
- Genus Vanilla P. Miller, 1754
- Genus Vanlaenoglottis J.M.H. Shaw, 2014
- Genus Vannerara J.M.H. Shaw, 2011
- Genus Vanphalanthe J.M.H. Shaw, 2013
- Genus Vanquetia J.M.H. Shaw, 2013
- Genus Vanschista J.M.H. Shaw, 2013
- Genus Vanstauropsis J.M.H. Shaw, 2013
- Genus Vansteenisara J.M.H. Shaw, 2013
- Genus Vantonia J.M.H. Shaw, 2013
- Genus Vantrichopsis J.M.H. Shaw, 2013
- Genus Vanvanda J.M.H. Shaw, 2004
- Genus Vappaculum M.A. Clements & D.L. Jones, 2002
- Genus Vappodes M.A. Clements & D.L. Jones, 2002 accepted as Dendrobium O. Swartz, 1799
- Genus Vargasara J.M.H. Shaw, 2011
- Genus Vargasiella C. Schweinfurth, 1952
- Genus Vascostylis Hort., 1964
- Genus Vasqueziella C.H. Dodson, 1982
- Genus Vaughnara Hort., 1965
- Genus Vazquezella D.L. Szlachetko & M. Sitko, 2012 accepted as Maxillaria Ruiz & Pavon, 1794
- Genus Vejvarutara Hort., 1987
- Genus Ventricularia Garay, 1972
- Genus Veraara J.M.H. Shaw, 2010
- Genus Verapazia F. Archila, 2012 accepted as Andreettaea C.A. Luer, 1978
- Genus Verapazia F. Archila, 2018 accepted as Andreettaea C.A. Luer, 1978
- Genus Verboonenara J.M.H. Shaw, 2009
- Genus Vermeulenia Á. Löve & D. Löve, 1973
- Genus Vervaetara J.M.H. Shaw, 2008
- Genus Vesicisepalum (J.J. Smith) L.A. Garay, F. Hamer & E.S. Siegerist, 1994
- Genus Vexillabium Maekawa, 1935 accepted as Kuhlhasseltia J.J. Smith, 1910
- Genus Veyretella D.L. Szlachetko & T.S. Olszewski, 1998
- Genus Veyretia D.L. Szlachetko, 1995
- Genus Vicentelara J.M.H. Shaw, 2013
- Genus Vieillardorchis Kränzlin, 1928 accepted as Goodyera R. Brown in W.T. Aiton, 1813
- Genus Vierlingia W. Königer, 2010 accepted as Cyrtochilum Kunth in Humboldt, Bonpland & Kunth, 1816
- Genus Vietorchis L.V. Averyanov & A.L. Averyanova, 2003
- Genus Vinckeara J.M.H. Shaw, 2007
- Genus Viracocha D.L. Szlachetko & M. Sitko, 2012 accepted as Maxillaria Ruiz & Pavon, 1794
- Genus Viraphandhuara Hort., 2000
- Genus Vitebrassonia J.M.H. Shaw, 2011
- Genus Vitechilum J.M.H. Shaw, 2011
- Genus Vitecidium J.M.H. Shaw, 2011
- Genus Vitekorchis A. Romowicz & D.L. Szlachetko, 2006
- Genus Volkertara J.M.H. Shaw, 2008
- Genus Vonbismarckara J.M.H. Shaw, 2011
- Genus Vonroemeria J.J. Smith, 1910 accepted as Octarrhena Thwaites, 1861
- Genus Vriesara J.M.H. Shaw, 2009
- Genus Vrydagzynea Blume, 1858-1859
- Genus Vuylstekeara Hort., 1911
- Genus Waibengara W.R. How & J.M.H. Shaw, 2001
- Genus Wailaiara Hort., 1999
- Genus Wailaihowara J.M.H. Shaw, 2013
- Genus Wailesia Lindley, 1849 accepted as Dipodium R. Brown, 1810
- Genus Waireia D.L. Jones, B.P.J. Molloy & M.A. Clements, 1997
- Genus Waironara Hort., 1997
- Genus Waiyengara W.R. How, 2005
- Genus Wallbrunnara J.M.H. Shaw, 2013
- Genus Wallnoeferia D.L. Szlachetko, 1994 accepted as Helonoma L.A. Garay, 1982
- Genus Waluewa Regel, 1890 accepted as Leochilus Knowles & Westcott, 1838
- Genus Warasara J.M.H. Shaw, 2009
- Genus Warburtonara J.M.H. Shaw, 2008
- Genus Warcatardia J.M.H. Shaw, 2010
- Genus Warchaubeanthes J.M.H. Shaw, 2011
- Genus Warchlerhyncha J.M.H. Shaw, 2011
- Genus Warczatoria J.M.H. Shaw, 2010
- Genus Warczebardia J.M.H. Shaw, 2010
- Genus Warczerhyncha J.M.H. Shaw, 2010
- Genus Warczewiczella H.G. Reichenbach, 1852
- Genus Warczewscaphe J.M.H. Shaw, 2010
- Genus Warmingia H.G. Reichenbach, 1881
- Genus Warneara Hort., 1964
- Genus Warnerara J.M.H. Shaw, 2009
- Genus Warrea Lindley, 1843
- Genus Warreella R. Schlechter, 1914
- Genus Warreopsis Garay, 1973
- Genus Warscaea D.L. Szlachetko, 1994 accepted as Cyclopogon K.B. Presl, 1827
- Genus Warscatoranthes J.M.H. Shaw, 2010
- Genus Warscewiczella H.G. Reichenbach, 1852 accepted as Chondrorhyncha J. Lindley, 1846
- Genus Warsewitschia Anonymous, 1849
- Genus Warszewiczara J.M.H. Shaw, 2010
- Genus Watanabeara K. Watanabe, 2008
- Genus Watsonara J.M.H. Shaw, 2004
- Genus Weberbauerara J.M.H. Shaw, 2011
- Genus Weidmannia G.A. Romero & G. Carnevali, 2010 accepted as Zygosepalum H.G. Reichenbach, 1859
- Genus Wellesleyara H. Griffits & J.M.H. Shaw, 2007
- Genus Wengangara W.L. How & J.M.H. Shaw, 2013
- Genus Westara Hort., 1980
- Genus Whitinara H. Griffits & J.M.H. Shaw, 2007
- Genus Whitmoorara J.M.H. Shaw, 2013
- Genus Wiganara J.M.H. Shaw, 2008
- Genus Wilburachangara J.M.H. Shaw, 2013
- Genus Wilburchangara Hort., 1982
- Genus Wilhelmara L. Wilhelm & J.M.H. Shaw, 2004
- Genus Wilkara C. Wilk & J.M.H. Shaw, 2003
- Genus Wilkinsara Hort., 1973
- Genus Williamcookara J.M.H. Shaw, 2008
- Genus Williampriceara J.M.H. Shaw, 2003
- Genus Williamsara J.M.H. Shaw, 2008
- Genus Williehowara W.L. How, J. Elliot & J.M.H. Shaw, 2013
- Genus Wilmotteara J.M.H. Shaw, 2009
- Genus Wilsonara Hort., 1916
- Genus Wingfieldara Hort., 1980
- Genus Winika M.A. Clements, D.L. Jones & B.P.J. Molloy, 1997
- Genus Winnara J.M.H. Shaw, 2008
- Genus Wiseara E. Wise, D. Wise & J.M.H. Shaw, 2004
- Genus Withnerara Hort., 1967
- Genus Wojcechowskiara A. Buckman, 2009
- Genus Wolleydodara J.M.H. Shaw, 2009
- Genus Wooara Hort., 1983
- Genus Wrefordara G.W. Dillon, 1969
- Genus Wrigleyara J.M.H. Shaw, 2007
- Genus Wudhikanakornara S. Mailamai & J.M.H. Shaw, 2008
- Genus Wullschlaegelia H.G. Reichenbach, 1863
- Genus Wutongshania Z.J. Liu & J.N. Zhang, 1998 accepted as Cymbidium O. Swartz, 1799
- Genus Wuttiphanara J.M.H. Shaw, 2016
- Genus Xanthoxerampellia D.L. Szlachetko & M. Sitko, 2012 accepted as Maxillaria Ruiz & Pavon, 1794
- Genus Xaritonia Rafinesque, 1838 accepted as Oncidium O. Swartz, 1800
- Genus Xeilyathum Rafinesque, 1837 accepted as Oncidium O. Swartz, 1800
- Genus Xenikophyton Garay, 1974
- Genus Xenosiella D.L. Szlachetko & M. Kolanowska, 2022
- Genus Xerorchis Schlechter, 1912
- Genus Xerriara Hort., 1998
- Genus Xiphizusa H.G. Reichenbach, 1852 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Xiphophyllum J.K. Ehrhart, 1789 accepted as Cephalanthera L.C. Richard, 1817
- Genus Xiphosium Griffith, 1844 accepted as Eria J. Lindley, 1825
- Genus Xycaste W. Jasen, 2021 accepted as Xylida J.M.H. Shaw, 2021
- Genus Xylida J.M.H. Shaw, 2021
- Genus Xylobium Lindley, 1825
- Genus Xylomoorea W. Jasen & J.M.H. Shaw, 2020
- Genus Yahiroara Hort., 1978
- Genus Yamadara Hort., 1960 accepted as Adamara A. Cogniaux, 1911
- Genus Yapara Hort., 1966
- Genus Yeeara Hort., 1994
- Genus Yeepengara Hort., 1998
- Genus Yeohbokara J.M.H. Shaw, 2013
- Genus Yinwaiara W.R. How, 2005
- Genus Yithoeara W.R. How, 2005
- Genus Yoania Maximowicz, 1872
- Genus Yolanda F.C. Hoehne, 1919 accepted as Brachionidium J. Lindley, 1859
- Genus Yoneoara Hort., 1972
- Genus Yonezawaara Hort., 1990
- Genus Youngyouthara H. Griffits & J.M.H. Shaw, 2002
- Genus Ypsilactyle J.M.H. Shaw, 2002
- Genus Ypsilopus Summerhayes, 1949
- Genus Ypsilorchis Z.J. Liu, S.C. Chen & L.J. Chen, 2008
- Genus Yuliara W. Tjiasmanto & J.M.H. Shaw, 2022
- Genus Yunorchis Z.J. Liu, G.Q. Zhang & M.H. Li, 2015 accepted as Yoania Maximowicz, 1872
- Genus Yusofara Hort., 1972
- Genus Yuwengangara W.L. How, 2016
- Genus Zelawillumnia J.M.H. Shaw, 2015
- Genus Zelemnia J.M.H. Shaw, 2004 accepted as Zelemnia J.M.H. Shaw, 2005
- Genus Zelemnia J.M.H. Shaw, 2005
- Genus Zelenchilum J.M.H. Shaw, 2003
- Genus Zelenchostele J.M.H. Shaw, 2004
- Genus Zelencidiostele J.M.H. Shaw, 2010
- Genus Zelencidopsis J.M.H. Shaw, 2011
- Genus Zelenettia J.M.H. Shaw, 2004
- Genus Zelengomestele J.M.H. Shaw, 2010
- Genus Zelenkoa M.W. Chase & N.H. Williams, 2001
- Genus Zelenkoara J.M.H. Shaw, 2004
- Genus Zelenkocidium J.M.H. Shaw, 2004
- Genus Zelglossoda J.M.H. Shaw, 2005
- Genus Zelglossoda J.M.H. Shaw, 2004 accepted as Zelglossoda J.M.H. Shaw, 2005
- Genus Zellahuntanthes J.M.H. Shaw, 2011
- Genus Zelomguezia J.M.H. Shaw, 2011
- Genus Zeloncidesa J.M.H. Shaw, 2011
- Genus Zeltonossum J.M.H. Shaw, 2005
- Genus Zeltonossum J.M.H. Shaw, 2004 accepted as Zeltonossum J.M.H. Shaw, 2005
- Genus Zelumguezia J.M.H. Shaw, 2004 accepted as Zelumguezia J.M.H. Shaw, 2005
- Genus Zelumguezia J.M.H. Shaw, 2005
- Genus Zelyrtodium J.M.H. Shaw, 2009
- Genus Zetagyne Ridley, 1921 accepted as Panisea (Lindley) Lindley, 1854
- Genus Zeuxina Lindley, 1826
- Genus Zeuxine Lindley, 1826
- Genus Zeuxinella L.V. Averyanov, 2003
- Genus Zhukowskia D.L. Szlachetko, R. González Tamayo & P. Rutkowski, 2000
- Genus Zoophora Bernhardi, 1800 accepted as Orchis Linnaeus, 1753
- Genus Zootrophion C.A. Luer, 1982
- Genus Zosterostylis Blume, 1825 accepted as Cryptostylis R. Brown, 1810
- Genus Zygobatemania Hort., 1899
- Genus Zygobatemannia Hort., 1899
- Genus Zygocaste Hort., 1946
- Genus Zygocastuloa J.M.H. Shaw, 2016
- Genus Zygocella L.A. Garay & H.R. Sweet, 1966
- Genus Zygocolax Rolfe, 1887
- Genus Zygodisanthus Hort., 1987
- Genus Zygogardmannia J.M.H. Shaw, 2012
- Genus Zygoglossum Reinwardt, 1825 accepted as Bulbophyllum Du Petit-Thouars, 1822
- Genus Zygolum L.A. Garay & H.R. Sweet in C.L. Withner, 1974
- Genus Zygomatophyllum A. Chen, 2010
- Genus Zygomena Pfitzer, 1906
- Genus Zygomena Hort. ex Engler & Prantl, 1908
- Genus Zygomenzella J.M.H. Shaw, 2010
- Genus Zygoncidesa J.M.H. Shaw, 2012
- Genus Zygoneria Hort., 1992
- Genus Zygonisatoria J.M.H. Shaw, 2010
- Genus Zygonisia Hort., 1902
- Genus Zygopabstia L.A. Garay, 1973
- Genus Zygopetalon W.J. Hooker, 1827 accepted as Zygopetalum W.J. Hooker, 1827
- Genus Zygopetalum W.J. Hooker, 1827
- Genus Zygophinia L.H. Chen, 2013
- Genus Zygorhyncha Hort., 1936
- Genus Zygosepalum H.G. Reichenbach, 1859
- Genus Zygosepella J.M.H. Shaw, 2010
- Genus Zygosepescalum J.M.H. Shaw, 2013
- Genus Zygostates Lindley, 1837
- Genus Zygosteria L. Glicenstein, 2013
- Genus Zygostylis L.A. Garay et al., 1965
- Genus Zygotorea Hort., 1990
- Genus Zygowarrea Hort., 1991
- Genus Zygozella J.M.H. Shaw, 2010
- Family Phormiaceae J.G. Agardh, 1858 accepted as Asphodelaceae de Jussieu, 1789
- Family Pycnanthaceae P. Ravenna, 2011 accepted as Orchidaceae de Jussieu, 1789
- Family Ruscaceae M. Roemer, 1840 accepted as Asparagaceae de Jussieu, 1789
- Family Tecophilaeaceae Leybold, 1862
- Family Themidaceae Salisbury, 1866 accepted as Asparagaceae de Jussieu, 1789
- Family Walleriaceae H. Huber ex Takhtajan, 1995 accepted as Tecophilaeaceae Leybold, 1862
- Family Xanthorrhoeaceae Dumortier, 1829 accepted as Asphodelaceae de Jussieu, 1789
- Family Xeronemataceae M.W. Chase, Rudall & M. F. Fay, 2000
- Order Asterales
- Order Aucubales accepted as Garryales
- Order Austrobaileyales
- Order Balanophorales accepted as Santalales
- Order Batales accepted as Brassicales
- Order Begoniales accepted as Cucurbitales
- Order Berberidales accepted as Ranunculales
- Order Berberidopsidales
- Order Biebersteiniales accepted as Sapindales
- Order Boraginales
- Order Brassicales
- Order Brexiales accepted as Celastrales
- Order Bromeliales accepted as Poales
- Order Bruniales
- Order Burmanniales accepted as Dioscoreales
- Order Burserales accepted as Sapindales
- Order Buxales
- Order Callitrichales accepted as Lamiales
- Order Calycerales accepted as Asterales
- Order Campanulales accepted as Asterales
- Order Canellales
- Order Capparales accepted as Brassicales
- Order Caryophyllales
- Order Casuarinales accepted as Fagales
- Order Celastrales
- Order Ceratophyllales
- Order Chloranthales
- Order Circaeasterales accepted as Ranunculales
- Order Cistales accepted as Malvales
- Order Colchicales accepted as Liliales
- Order Commelinales
- Order Cornales
- Order Corylales accepted as Fagales
- Order Crossosomatales
- Order Cucurbitales
- Order Cyclanthales accepted as Pandanales
- Order Cynomoriales accepted as Saxifragales
- Order Cyperales accepted as Poales
- Order Daphniphyllales accepted as Saxifragales
- Order Desfontainiales accepted as Bruniales
- Order Diapensiales accepted as Ericales
- Order Didymelales accepted as Buxales
- Order Dilleniales
- Order Dioscoreales
- Order Dipsacales
- Order Ebenales accepted as Ericales
- Order Ericales
- Order Eriocaulales accepted as Poales
- Order Escalloniales
- Order Eucommiales accepted as Garryales
- Order Euphorbiales accepted as Malpighiales
- Order Fabales
- Order Fagales
- Order Francoales accepted as Geraniales
- Order Garryales
- Order Gentianales
- Order Geraniales
- Order Glaucidiales accepted as Ranunculales
- Order Griseliniales accepted as Apiales
- Order Gunnerales
- Order Haemodorales accepted as Commelinales
- Order Haloragales accepted as Saxifragales
- Order Hamamelidales accepted as Saxifragales
- Order Helobiales accepted as Alismatales
- Order Helwingiales accepted as Aquifoliales
- Order Huerteales
- Order Hydatellales accepted as Nymphaeales
- Order Hydrangeales accepted as Cornales
- Order Hydrastidales accepted as Ranunculales
- Order Hydrocharitales accepted as Alismatales
- Order Hydropeltidales accepted as Nymphaeales
- Order Hypericales accepted as Malpighiales
- Order Hypoxidales accepted as Asparagales
- Order Icacinales
- Order Illiciales accepted as Austrobaileyales
- Order Iridales accepted as Asparagales
- Order Juglandales accepted as Fagales
- Order Juncaginales accepted as Alismatales
- Order Juncales accepted as Poales
- Order Lamiales
- Order Laurales
- Order Lecythidales accepted as Ericales
- Order Leitneriales accepted as Sapindales
- Order Liliales
- Order Linales accepted as Malpighiales
- Order Magnoliales
- Order Magnoliopsida (awaiting allocation)
- Order Malpighiales
- Order Malvales
- Order Melanthiales accepted as Liliales
- Order Metteniusales
- Order Myricales accepted as Fagales
- Order Myrsinales accepted as Ericales
- Order Myrtales
- Order Najadales accepted as Alismatales
- Order Nepenthales accepted as Caryophyllales
- Order Nymphaeales
- Order Ochnales accepted as Malpighiales
- Order Oleales accepted as Lamiales
- Order Orchidales accepted as Asparagales
- Order Oxalidales
- Order Pandanales
- Order Papaverales accepted as Ranunculales
- Order Paracryphiales
- Order Parnassiales accepted as Celastrales
- Order Petrosaviales
- Order Picramniales
- Order Piperales
- Order Plantaginales accepted as Lamiales
- Order Plumbaginales accepted as Caryophyllales
- Order Poales
- Order Podostemales accepted as Malpighiales
- Order Polygalales accepted as Fabales
- Order Polygonales accepted as Caryophyllales
- Order Primulales accepted as Ericales
- Order Proteales
- Order Rafflesiales accepted as Malpighiales
- Order Ranunculales
- Order Restionales accepted as Poales
- Order Rhamnales accepted as Rosales
- Order Rhizophorales accepted as Malpighiales
- Order Roridulales accepted as Ericales
- Order Rosales
- Order Rubiales accepted as Gentianales
- Order Rutales accepted as Sapindales
- Order Sabiales accepted as Proteales
- Order Salicales accepted as Malpighiales
- Order Santalales
- Order Sapindales
- Order Sarbaicarpales †
- Order Saxifragales
- Order Scrophulariales accepted as Lamiales
- Order Smilacales accepted as Liliales
- Order Solanales
- Order Stemonales accepted as Pandanales
- Order Tamaricales accepted as Caryophyllales
- Order Tecophilaeales accepted as Asparagales
- Order Theales accepted as Ericales
- Order Thymelaeales accepted as Malvales
- Order Toricelliales accepted as Cornales
- Order Trilliales accepted as Liliales
- Order Triuridales accepted as Pandanales
- Order Trochodendrales
- Order Typhales accepted as Poales
- Order Urticales accepted as Rosales
- Order Vahliales
- Order Viburnales accepted as Dipsacales
- Order Violales accepted as Malpighiales
- Order Vitales
- Order Xanthorrhoeales accepted as Asparagales
- Order Zingiberales
- Order Zygophyllales
- Family Archaefructaceae G. Sun, Q. Ji, D.L. Dilcher, S. Zheng, K.C. Nixon & X. Wang, 2002 †
- Family Sinoherbaceae Z.-J. Liu & X. Wang in Liu et al., 2021 †
- Genus Aachenosaurus Smets, 1887 † accepted as Aachenoxylon M. Hovelacque, 1889 †
- Genus Aachenoxylon M. Hovelacque, 1889 †
- Genus Antholithes A.T. Brongniart, 1822 †
- Genus Archaebuda L.-J. Chen & X. Wang, 2022 †
- Genus Ascarinophyllum J. Čepičková & J. Kvaček, 2022 †
- Genus Atrichodendron Gagnepain, 1950
- Genus Barykovia M.G. Moiseeva, 2012 †
- Genus Bergacarpon J. Marmi, B. Gomez, S. Villalba-Breva & C. Martín-Closas, 2012 †
- Genus Bilitalium F. Buchanan-Hamilton, 1807
- Genus Caliciflora E.M. Friis, K.R. Pedersen & P.R. Crane, 2016 †
- Genus Carpestella M. von Balthazar, K.R. Pedersen, P.R. Crane & E.M. Friis, 2008 †
- Genus Catanthus E.M. Friis, P.R. Crane & K.R. Pedersen, 2020 †
- Genus Cavilignum C. Siegert & E.J. Hermsen, 2020 †
- Genus Chainandra G.O. Poinar Jr. & K.L. Chambers, 2020 †
- Genus Covidifructus Z. Heřmanová, J. Čepičková, J. Kvaček, M. von Balthazar & J. Schönenberger, 2022 †
- Genus Cratolirion C. Coifard, N. Kardjilov & M.E.C. Bernardes-de-Oliveira in Coifard et al., 2019 †
- Genus Culmites A.T. Brongniart, 1822 †
- Genus Cyathitepala G.O. Poinar Jr. & K.L. Chambers, 2020 †
- Genus Dilcherifructus X. Wang, 2021 †
- Genus Dillhoffia S.R. Manchester & K.B. Pigg, 2008 †
- Genus Dinganthus X.-D. Liu, J.B. Diez, Y. Fan, Z.-J. Liu & X. Wang, 2020 †
- Genus Elasmostemon E.M. Friis, P.R. Crane, K.R. Pedersen, M.M. Mendes & J. Kvaček, 2022 †
- Genus Endressistemon E.M. Friis, P.R. Crane, K.R. Pedersen, M.M. Mendes & J. Kvaček, 2022 †
- Genus Exogenites A.T. Brongniart, 1822 †
- Genus Fairlingtonia N.A. Jud, 2015 †
- Genus Florigerminis D.-F. Cui, Y. Hou, P. Yin & X. Wang, 2022 †
- Genus Fouldenia J.M. Bannister, D.E. Lee & J.I. Raine 2005 †
- Genus Friisifructus K.K. Tang, S.Y. Smith & B.A. Atkinson, 2023 †
- Genus Gansufructus B. Du in Du et al., 2021 †
- Genus Gansupeltata G.-T. Wu, W.-X. Ren, L. Han, H.-S. Wang, Y.-F. Hua & B.-N. Sun, 2022 †
- Genus Harmsia E. McIver & J.F. Basinger, 1993 † accepted as Mciveriella A.B. Doweld, 2016 †
- Genus Herbifolia A. Frolov & I. Enushchenko, 2022 †
- Genus Honeytheca I.B. Huegele & S.R. Manchester, 2022 †
- Genus Ibericarpus E.M. Friis, P.R. Crane, K.R. Pedersen, M.M. Mendes & J. Kvaček, 2022 †
- Genus Kachaikenia R. Cunéo & M.A. Gandolfo, 2005 †
- Genus Kenilanthus E.M. Friis, K.R. Pedersen & P.R. Crane, 2016 †
- Genus Lingyuananthus X. Wang, 2022 †
- Genus Mciveriella A.B. Doweld, 2016 †
- Genus Menatanthus D. Uhl, K.N. Paudayal & H. El Atfy in Uhl et al., 2020 †
- Genus Nicolia Unger in Endlicher, 1842 †
- Genus Nitaspermum E.M. Friis, P.R. Crane & K.R. Pedersen, 2018 †
- Genus Paisia E.M. Friis, M.M. Mendes & K.R. Pedersen, 2018 †
- Genus Phantophlebia G.O. Poinar, Jr. & K.L. Chambers, 2020 †
- Genus Sherwinoxylon A. Boura & G. Saulnier in Boura et al., 2019 †
- Genus Singpuria D. Ramteke, S.R. Manchester & V.D. Nagrale in Ramteke et al., 2020 †
- Genus Strombothelya G.O. Poinar, Jr. & K.L. Chambers, 2019 †
- Genus Tanispermum E.M. Friis, P.R. Crane & K.R. Pedersen, 2018 †
- Genus Thorphyllum R. Cunéo & M.A. Gandolfo, 2005 †
- Genus Tolmania N.L. Edmonds, R.A. Stockey & G.W. Rothwell, 2022 †
- Genus Ubiquitoxylon E.A. Wheeler in Wheeler et al., 2019 †
- Genus Valvidistemon E.M. Friis, P.R. Crane, K.R. Pedersen, M.M. Mendes & J. Kvaček, 2022 †
- Genus Wingia H. Wang & D.L. Dilcher, 2018 †
- Genus Wireroadia X. Zhang, Y. Wang, D.L. Dilcher & S.R. Manchester, 2020 †
- Genus Zlatkovia G.W. Rothwell & R.A. Stockey, 2022 †
- Genus Compitoxylon Gentis, De Franceschi & Boura, 2023 †
- Genus Pteroheterochrosperma M.A. Smith, D.E. Greenwalt & S.R. Manchester, 2023 †
- Genus Quadrasubulaflora M.A. Smith, D.E. Greenwalt & S.R. Manchester, 2023 †
- Genus Racheliflora E.M. Friis, P.R. Crane & K.R. Pedersen, 2023 †
- Genus Tortorellixylon C.F. Rombola, R.R. Pujana, D.P. Ruiz & E.S. Bellosi, 2023 †
- Genus Xilinia X. Wang, J.B. Diez, M. Pole & M. García-Ávila, 2023 †
- Superclass Gymnospermae
- Genus Bevhalstia C.R. Hill, 1996 †
- Genus Carpolithus E.T. Artis, 1825 †
- Genus Combina A.A. Santos & X. Wang, 2022 †
- Genus Juraherba G. Han, Z. Liu, X. Liu, L. Mao, F.M.B. Jacques & X. Wang, 2016 †
- Genus Muricosperma L.J. Seyfullah & J. Hilton in Seyfullah et al., 2010 †
- Genus Nothodichocarpum G. Han, Z. Liu & X. Wang, 2017 †
- Genus Problematospermum A.I. Turutanova-Ketova in J.A. Orlov, 1963 ex Krassilov, 1973 †
- Genus Qingganninginfructus X. Wang & Sun in Han et al., 2023 †
- Genus Renbernia E.M. Friis, P.R. Crane & K.R. Pedersen, 2022 †
- Genus Xingxueanthus X. Wang & S. Wang, 2010 †
- Genus Yiduxylon D.M. Wang & L. Liu, 2015 †
- Genus Yuhania Z.-J. Liu & X. Wang, 2016 †
- Class Progymnospermopsida †
- Class Pteridophyta/Pteridospermophyta (unclassified foliage) †
- Class Rhyniopsida †
- Class Trimerophytopsida †
- Class Zosterophyllopsida †
- Order Stenokoleales †
- Genus Ahnetia A.-L. Decombeix & J. Galtier, 2017 †
- Genus Aysenoxylon R.R. Pujana, J.E. Bostelmann, R.A. Ugalde, M.P. Riquelme & T. Torres, 2023 †
- Genus Dameria A.-L. Decombeix, B. Meyer-Berthaud, J. Galtier, J.A. Talent & R. Mawson, 2011 †
- Genus Dibracophyton S.-G. Hao, J.-Z. Xue, X. Zhu & D.-M. Wang, 2012 †
- Genus Douaphyton H.-H. Xu, Y. Wang, P. Tang & Y. Wang, 2017 †
- Genus Endogenites A.T. Brongniart, 1822 †
- Genus Flabellopteris R.W. Gess & C. Prestianni, 2021 †
- Genus Franhueberia L.A. Hoffman & A.M.F. Tomescu, 2013 †
- Genus Jowingera M.A. Bickner & A.M.F. Tomescu, 2019 †
- Genus Kenrickia S. Toledo & A.M.F. Tomescu in Toledo et al., 2021 †
- Genus Leptocentroxyla M.A. Bickner & A.M.F. Tomescu, 2019 †
- Genus Macrotaeniopteris W.P. Schimper, 1869 †
- Genus Mosacaulis R.W.J.M. van der Ham & J.H.A. van Konijnenburg-van Cittert in van der Ham et al., 2011 †
- Genus Nebuloxyla M.A.K. Lalica & A.M.F. Tomescu, 2023 †
- Genus Ninsaria A.-L. Decombeix, J. Galtier, S. McLoughlin & B. Meyer-Berthaud in Decombeix et al., 2019 †
- Genus Oleandridium W.P. Schimper, 1869 †
- Genus Perplexa K.C. Pfeiler & A.M.F. Tomescu, 2023 †
- Genus Petrosjania S.M. Snigirevsky & A.P. Lyubarova, 2023 †
- Genus Planatophyton P. Gerrienne, B. Meyer-Berthaud, N. Yang, P. Steemans & C.-S. Li, 2014 †
- Genus Poacites Schlotheim ex Ballenstedt, 1822 †
- Genus Sporangites J.W. Dawson, 1863 †
- Genus Stenoloboxyla M.A. Bickner & A.M.F. Tomescu, 2019 †
- Genus Taeniopteris A.T. Brongniart, 1828 †
- Genus Tainioxyla M.A. Bickner & A.M.F. Tomescu, 2019 †
- Genus Thursophyton A.G. Nathorst, 1914-1915 †
- Genus Thursophyton A.G. Nathorst ex E.A.N. Arber, 1921 † accepted as Thursophyton A.G. Nathorst, 1914-1915 †
- Genus Tichavekia J. Pšenička, J. Sakala & P. Kraft in Kraft et al., 2019 †
- Genus Tregiovia G. Forte & E. Kustatscher, 2023 †
- Genus Wilhowia P.G. Gensel, 2022 †
- Genus Xadzigacalix A.A. Klymiuk, G.W. Rothwell & R.A. Stockey, 2022 †
- Genus Xinhangia J.-N. Yang & D.-M. Wang, 2022 †
- Genus Yabeiella S. Ôishi, 1931 †
- Phylum Vendophyta † accepted as Algae incertae sedis
- Class Nematophyceae † accepted as Nematophyta †
- Kingdom Protista accepted as Protozoa
- Kingdom Protozoa
- Kingdom Viruses
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