• Lemna Duméril, 1856 accepted as Lamna Cuvier, 1816 [Family: Lamnidae]
• Lemna Linnaeus, 1753 [Family: Araceae]
• Lemna Rafinesque, 1817 (unaccepted) [Family: Ricciaceae]
• Lemna aequinoctialis Welw.
• Lemna angolensis Welw. accepted as Lemna aequinoctialis Welw.
• Lemna aoukikusa T. Beppu & Murata accepted as Lemna aequinoctialis Welw.
• Lemna arrhiza Linnaeus accepted as Wolffia arrhiza (L.) Horkel ex Wimm.
• Lemna bannatica Waldst. & Kit. ex Schleid. accepted as Spirodela polyrrhiza (L.) Schleid.
• Lemna bisulca Veesenm. accepted as Lemna trisulca L.
• Lemna blatteri McCann accepted as Lemna aequinoctialis Welw.
• Lemna cherokensis Schwein. ex Hegelm. accepted as Lemna valdiviana Phil.
• Lemna conjugata Willd. ex Schleid. accepted as Lemna minor Linnaeus
• Lemna cordata Sessé & Moç. accepted as Lemna gibba Linnaeus
• Lemna cruciata Roxb. accepted as Lemna trisulca L.
• Lemna cyclostasa Elliott ex Chev. accepted as Lemna minor Linnaeus
• Lemna cyclostasa Elliott ex W. Thomps. accepted as Lemna valdiviana Phil.
• Lemna dimidiata Raf.
• Lemna disperma Hegelm.
• Lemna ecuadorensis Landolt accepted as Lemna obscura (Austin) Daubs
• Lemna eleanorae McCann accepted as Lemna aequinoctialis Welw.
• Lemna gibba Linnaeus
• Lemna globosa Roxb. accepted as Wolffia globosa (Roxb.) Hartog & Plas
• Lemna hyalina Delile accepted as Wolffiella hyalina (Delile) Monod
• Lemna intermedia Ruthe accepted as Lemna trisulca L.
• Lemna japonica Landolt
• Lemna javanica F.A. Bauer ex Hegelm. accepted as Landoltia punctata (G. Mey.) Les & D.J. Crawford
• Lemna leiboensis M.G. Liu & C.H. Hou accepted as Lemna aequinoctialis Welw.
• Lemna major Griff. accepted as Spirodela polyrrhiza (L.) Schleid.
• Lemna maxima Blatt. & Hallb. accepted as Spirodela polyrrhiza (L.) Schleid.
• Lemna melanorrhiza F. Muell. ex Kurz accepted as Landoltia punctata (G. Mey.) Les & D.J. Crawford
• Lemna microscopica Schur accepted as Wolffia arrhiza (L.) Horkel ex Wimm.
• Lemna minima Blatt. & Hallb. accepted as Lemna aequinoctialis Welw.
• Lemna minima Chev. accepted as Lemna minor Linnaeus
• Lemna minima Phil. ex Hegelm. accepted as Lemna minuta Kunth
• Lemna minor Linnaeus
• Lemna minuscula Herter accepted as Lemna minuta Kunth
• Lemna minuta Kunth
• Lemna minuta Raf. accepted as Lemna valdiviana Phil.
• Lemna monorhiza Montandon accepted as Lemna minor Linnaeus
• Lemna obcordata Bojer accepted as Lemna minor Linnaeus
• Lemna obcordata Vahl
• Lemna oblonga Phil. accepted as Wolffiella oblonga (Phil.) Hegelm.
• Lemna obscura (Austin) Daubs
• Lemna oligorrhiza Kurz accepted as Landoltia punctata (G. Mey.) Les & D.J. Crawford
• Lemna orbicularis Kit. ex Schult. accepted as Spirodela polyrrhiza (L.) Schleid.
• Lemna orbiculata Roxb. accepted as Spirodela polyrrhiza (L.) Schleid.
• Lemna ovata A. Br. ex C. Krauss accepted as Lemna minor Linnaeus
• Lemna palustris (Garsault) Haenke ex Mert. & Koch accepted as Lemna minor Linnaeus
• Lemna palustris Rojas
• Lemna parodiana Giardelli accepted as Lemna gibba Linnaeus
• Lemna paucicostata Hegelm. accepted as Lemna aequinoctialis Welw.
• Lemna perpusilla Torr.
• Lemna pleiorrhiza F. Muell. accepted as Landoltia punctata (G. Mey.) Les & D.J. Crawford
• Lemna polyrrhiza Linnaeus accepted as Spirodela polyrrhiza (L.) Schleid.
• Lemna punctata G. Mey. accepted as Landoltia punctata (G. Mey.) Les & D.J. Crawford
• Lemna pusilla Hegelm. accepted as Landoltia punctata (G. Mey.) Les & D.J. Crawford
• Lemna rwandensis De Sloover accepted as Lemna minor Linnaeus
• Lemna tenera Kurz
• Lemna thermalis P. Beauv. ex Nutt. accepted as Spirodela polyrrhiza (L.) Schleid.
• Lemna torreyi Austin accepted as Lemna valdiviana Phil.
• Lemna transsilvanica Schur accepted as Spirodela polyrrhiza (L.) Schleid.
• Lemna trichorrhiza Thuill. ex Schleid. accepted as Lemna gibba Linnaeus
• Lemna trinervis (Austin) Small accepted as Lemna aequinoctialis Welw.
• Lemna trisulca L.
• Lemna turionifera Landolt
• Lemna umbonata A. Br. ex Hegelm. accepted as Spirodela polyrrhiza (L.) Schleid.
• Lemna valdiviana Phil.
• Lemna vulgaris (Lam.) Lam. accepted as Lemna minor Linnaeus
• Lemna yungensis Landolt
• Lemnaceae Gray, 1822 accepted as Araceae de Jussieu, 1789
• Lemnaceaepites B. Biswas, 1962 † (uncertain)
• Lemnalia Gray, 1868
• Lemnalia acutispiculata Verseveldt, 1969
• Lemnalia africana (May, 1898)
• Lemnalia amabilis Tixier-Durivault, 1966
• Lemnalia bantayensis Roxas, 1933
• Lemnalia benayahui Verseveldt, 1982
• Lemnalia bournei Roxas, 1933
• Lemnalia carnosa (Kükenthal, 1896)
• Lemnalia cervicornis (May, 1898)
• Lemnalia crassicaulis Verseveldt, 1969
• Lemnalia digitata (May, 1898)
• Lemnalia elegans (May, 1898)
• Lemnalia exilis Tixier-Durivault, 1966
• Lemnalia faustinoi Roxas, 1933
• Lemnalia flava (May, 1898)
• Lemnalia fragilis Tixier-Durivault, 1966
• Lemnalia gracilis Tixier-Durivault, 1966
• Lemnalia grandispina Roxas, 1933
• Lemnalia humesi Verseveldt, 1969
• Lemnalia jukesii Gray, 1868
• Lemnalia laevis Thomson & Dean, 1931
• Lemnalia longiramus Verseveldt, 1969
• Lemnalia madagascarensis Verseveldt, 1969
• Lemnalia nitida (Verrill, 1864)
• Lemnalia peristyla Bourne, 1900
• Lemnalia philippinensis (May, 1899)
• Lemnalia rhabdota Bourne, 1900
• Lemnalia scasa Roxas, 1933
• Lemnalia squamifera Thomson & Dean, 1931