• Smithia França, 1910 accepted as Babesia Starcovivi, 1893 [Family: Babesiidae]
• Smithia J.F. Gmelin, 1791 (unaccepted) [Family: Solanales (awaiting allocation)]
• Smithia Mabille, 1880 (uncertain) [Family: Lepidoptera (awaiting allocation)]
• Smithia Maltzan, 1883 accepted as Callostracum E. A. Smith, 1909 [Family: Turritellidae]
• Smithia Milne-Edwards & Haime, 1851 (uncertain) [Family: Cnidaria (awaiting allocation)]
• Smithia Monterosato, 1884 accepted as Smithiella Monterosato, 1890 accepted as Mangelia Risso, 1826 [Family: Mangeliidae]
• Smithia Saussure, 1855 (uncertain) [Family: Vespidae]
• Smithia Scopoli, 1777 (unaccepted) [Family: Clusiaceae]
• Smithia Vachal, 1897 accepted as Melittosmithia Schulz, 1906 [Family: Colletidae]
• Smithia W. Aiton, 1789 [Family: Fabaceae]
• Smithia abyssinica (A. Rich.) Verdc.
• Smithia aeschynomenoides Baker accepted as Kotschya aeschynomenoides (Baker) Dewit & P.A. Duvign.
• Smithia agharkarii Hemadri
• Smithia aspera Roxb. accepted as Aeschynomene indica Linnaeus, 1753
• Smithia bequaertii De Wild. accepted as Kotschya africana Endl.
• Smithia bernieri Baill. accepted as Aeschynomene uniflora E. Mey.
• Smithia bigemina Dalzell
• Smithia blanda Wall.
• Smithia bodinieri H. Lev. accepted as Smithia blanda Wall.
• Smithia burttii Baker f. accepted as Kotschya capitulifera (Baker) Dewit & P.A. Duvign.
• Smithia capitata Dalzell
• Smithia cavaleriei H. Lev. accepted as Smithia ciliata Royle
• Smithia chamaecrista Benth. accepted as Kotschya africana Endl.
• Smithia ciliata Royle
• Smithia coerulescens Zoll. & Morong accepted as Smithia ciliata Royle
• Smithia conferta Sm.
• Smithia dichotoma Baker accepted as Smithia salsuginea Hance
• Smithia domingensis DC. accepted as Aeschynomene pleuronervia DC.
• Smithia elaphroxylon (Guill. & Perr.) Baill. accepted as Aeschynomene elaphroxylon (Guill. & Perr.) Taub.
• Smithia elliotii Baker f.
• Smithia erubescens (E. Mey.) Baker f.
• Smithia erubescens sensu Dewit & P.A. Duvign. accepted as Smithia elliotii Baker f.
• Smithia eurycalyx Harms accepted as Kotschya eurycalyx (Harms) Dewit & P.A. Duvign.
• Smithia finetii Gagnep.
• Smithia flava Prain accepted as Smithia laxiflora Wight & Arn.
• Smithia geminiflora Roth accepted as Smithia conferta Sm.
• Smithia goetzei Harms accepted as Kotschya goetzei (Harms) Verdc.
• Smithia gracilis Benth.
• Smithia grandidieri Baill. accepted as Aeschynomene elaphroxylon (Guill. & Perr.) Taub.
• Smithia grandis Baker
• Smithia hirsuta Dalzell
• Smithia hispidissima Zoll. & Morong accepted as Smithia conferta Sm.
• Smithia japonica Maxim. accepted as Smithia ciliata Royle
• Smithia javanica Benth. accepted as Smithia sensitiva Aiton
• Smithia kotschyi Benth. accepted as Kotschya africana Endl.
• Smithia laxiflora Wight & Arn.
• Smithia lutea Porteres accepted as Kotschya lutea (Porteres) Hepper
• Smithia micrantha Harms accepted as Kotschya micrantha (Harms) Hepper
• Smithia mildbraedii Harms accepted as Kotschya aeschynomenoides (Baker) Dewit & P.A. Duvign.
• Smithia nagasawai Hayata accepted as Smithia ciliata Royle
• Smithia ochreata Taub. accepted as Kotschya ochreata (Taub.) Dewit & P.A. Duvign.
• Smithia oligantha Blatt.
• Smithia oubanguiensis Tisser. accepted as Kotschya oubanguiensis (Tisser.) Verdc.
• Smithia paniculata Arn. accepted as Smithia blanda Wall.
• Smithia parvifolia Burtt Davy accepted as Kotschya parvifolia (Burtt Davy) Verdc.
• Smithia perrieri R. Vig. accepted as Kotschya perrieri (R. Vig.) Verdc.
• Smithia platyphylla Brenan accepted as Kotschya platyphylla (Brenan) Verdc.
• Smithia princeana Harms accepted as Kotschya princeana (Harms) Verdc.
• Smithia prittwitzii Harms accepted as Kotschya prittwitzii (Harms) Verdc.
• Smithia purpurea Hook.
• Smithia pycnantha Baker
• Smithia racemosa Wight & Arn. accepted as Smithia blanda Wall.
• Smithia recurvifolia Taub. accepted as Kotschya recurvifolia (Taub.) F. White
• Smithia reflexa Porteres accepted as Kotschya carsonii (Baker) Dewit & P.A. Duvign.
• Smithia rosea R. Vig. accepted as Smithia elliotii Baker f.
• Smithia salsuginea Hance
• Smithia scaberrima Taub. accepted as Kotschya scaberrima (Taub.) Wild
• Smithia schweinfurthii Taub. accepted as Kotschya schweinfurthii (Taub.) Dewit & P.A. Duvign.
• Smithia sensitiva Aiton
• Smithia setulosa Dalzell
• Smithia speciosa Hutch. accepted as Kotschya speciosa (Hutch.) Hepper
• Smithia stolonifera Brenan accepted as Kotschya stolonifera (Brenan) Dewit & P.A. Duvign.
• Smithia strigosa Benth. accepted as Kotschya strigosa (Benth.) Dewit & P.A. Duvign.
• Smithia strobilantha Baker accepted as Kotschya strobilantha (Baker) Dewit & P.A. Duvign.
• Smithia strobilantha sensu Brenan accepted as Kotschya prittwitzii (Harms) Verdc.
• Smithia trochainii Berhaut accepted as Aeschynomene crassicaulis Harms
• Smithia uguenensis sensu auct. accepted as Kotschya ochreata (Taub.) Dewit & P.A. Duvign.
• Smithia uguenensis Taub. accepted as Kotschya uguenensis (Taub.) F. White
• Smithia uniflora A. Chev. accepted as Kotschya uniflora (A. Chev.) Hepper
• Smithia venkobarowii Gamble
• Smithia volkensii Taub. accepted as Kotschya aeschynomenoides (Baker) Dewit & P.A. Duvign.
• Smithia yunnanensis Franch. accepted as Smithia blanda Wall.
• Smithiantha O. Kuntze, 1891
• Smithiaster Barras, 2007 †
• Smithiastrum M.R. Morin, 2020