| Orchidaceae | |
Aa
| Rchb. f. | Xenia Orchid. 1: 18 | 1858 [1854] |
| Orchidaceae | |
Abaxianthus
| M.A.Clem. & D.L. Jones | Orchadian 13: 485 | 2002 |
| Orchidaceae | |
Abdominea
| J.J. Sm. | Bull. Jard. Bot. Buitenzorg, sér. 2 14: 52 | 1914 |
| Orchidaceae | ** |
Aberrantia
| Luer | Monogr. Syst. Bot. Missouri Bot. Gard. 95: 253 | 2004 |
| Orchidaceae | ! |
Aberrantia
| Luer | Monogr. Syst. Bot. Missouri Bot. Gard. 103: 310 | 2005 |
| Orchidaceae | * |
Abola
| Lindl. | Fol. Orchid. Abola 4 | 1853 |
| Orchidaceae | ** |
Abrochis
| Neck. | Elem. Bot. 3: 130 | 1790 |
| Orchidaceae | ! |
Abrochis
| Neck. ex Raf. | Fl. Tellur. 4: 36 | 1838 |
| Orchidaceae | |
Acacallis
| Lindl. | Fol. Orchid. Acacallis 4: 1 | 1853 |
| Orchidaceae | !! |
Acampe
| Lindl. | Fol. Orchid. Acampe 1 | 1853 |
| Orchidaceae | |
× Acampodorum
| J.M.H. Shaw | Orchid Rev. 111(1253): 76 | 2003 |
| Orchidaceae | |
× Acampostylis
| J.M.H. Shaw | Orchid Rev. Suppl., 115(1274): 18 | 2007 |
| Orchidaceae | ** |
Acanthephippium
| Blume ex Endl. | Gen. Pl. 200 | 1837 |
| Orchidaceae | |
Acanthoglossum
| Blume | Bijdr. Fl. Ned. Ind. (8): 381–382 | 1825 |
| Orchidaceae | |
Acanthophippium
| Blume | Bijdr. Fl. Ned. Ind. (7): 353-354 | 1825 |
| Orchidaceae | |
Aceraherminium
| E.G. Camus | Iconogr. Orchid. Europe 2: 366 | 1929 |
| Orchidaceae | |
× Aceraherminium
| E.G. Camus | Iconogr. Orchid. Europe 2: 366 | 1929 |
| Orchidaceae | |
Aceras
| R. Br. | Hortus Kew. (ed. 2) 5: 191 | 1813 |
| Orchidaceae | |
Acerasherminium
| Gremli | 3: 35 | 1883 |
| Orchidaceae | |
× Acerasherminium
| Gremli | Neue Beitr. Fl. Schweiz 3: 35 | 1883 |
| Orchidaceae | |
Aceratorchis
| Schltr. | Repert. Spec. Nov. Regni Veg. Beih. 12: 328 | 1922 |
| Orchidaceae | |
Achlydosa
| M.A.Clem. & D.L. Jones | Orchadian 13: 439 | 2002 |
| Orchidaceae | *** |
Achroanthes
| Raf. | Amer. Monthly Mag. & Crit. Rev. 4: 195 | 1819 |
| Orchidaceae | |
Acianthella
| D.L. Jones & M.A.Clem. | Orchadian 14: 331 | 2004 |
| Orchidaceae | ! |
Acianthera
| Scheidw. | Allg. Gartenzeitung 10(37): 292 | 1842 |
| Orchidaceae | * |
Acianthopsis
| Szlach. | Polish Bot. J. 46(2): 143 | 2001 [2002] |
| Orchidaceae | * |
Acianthopsis
| M.A. Clem. & D.L. Jones | Orchadian 13: 440 | 2002 |
| Orchidaceae | |
Acianthus
| R. Br. | Prodr. 321 | 1810 |
| Orchidaceae | |
× Acinbreea
| auct. | Orchid Rev. 93(1106): cppo: 12 | 1985 |
| Orchidaceae | |
Acineta
| Lindl. | Edwards's Bot. Reg. 29: Misc. 67 | 1843 |
| Orchidaceae | |
Acinopetala
| Luer | Monogr. Syst. Bot. Missouri Bot. Gard. 105: 3 | 2006 |
| Orchidaceae | |
× Aciopea
| Gav.-Correa | Orchid Rev. Suppl. 113(1262): 21 | 2005 |
| Orchidaceae | * |
Ackermania
| Dodson & R. Escobar | Orquideología 18(3): 202 | 1993 |
| Orchidaceae | ** |
Ackersteinia
| Neudecker | Orquideología 19: 25 | 1994 |
| Orchidaceae | |
× Ackersteinia
| Neudecker | Orquideología 19(2): 25 | 1994 |
| Orchidaceae | |
Aclinia
| Griff. | Not. Pl. Asiat. 3: 320 | 1851 |
| Orchidaceae | ** |
Acoidium
| Lindl. | Edwards's Bot. Reg. 23: sub t. 1951 | 1837 |
| Orchidaceae | |
Acoridium
| Nees & Meyen | Cyperaceae 79 | 1841 |
| Orchidaceae | |
Acostaea
| Schltr. | Repert. Spec. Nov. Regni Veg. Beih. 19: 22, 102, 283 | 1923 |
| Orchidaceae | |
Acraea
| Lindl. | Pl. Hartw. 155 | 1845 |
| Orchidaceae | * |
Acrea
| Lindl. | Pl. Hartw. 155 | 1845 |
| Orchidaceae | ! |
Acriopsis
| Reinw. ex Blume | Bijdr. Fl. Ned. Ind. (8): 376-377 | 1825 |
| Orchidaceae | ** |
Acriopsis
| Reinw. ex Blume | Catalogus 97 | 1823 |
| Orchidaceae | ** |
Acroanthes
| Raf. | J. Phys. Chim. Hist. Nat. Arts 89: 261 | 1819 |
| Orchidaceae | |
Acrochaene
| Lindl. | Fol. Orchid. Achrochaene 1 | 1853 |
| Orchidaceae | |
Acrolophia
| Pfitzer | Entw. Nat. Anord. Orchid 59 | 1887 |
| Orchidaceae | |
Acronia
| C. Presl | Reliq. Haenk. 1: 103 | 1827 |
| Orchidaceae | |
Acropera
| Lindl. | Gen. Sp. Orchid. Pl. 172 | 1830-1840 [1833] |
| Orchidaceae | |
Acrorchis
| Dressler | Orquídea (Mexico City), n.s. 12(1): 14 | 1990 |
| Orchidaceae | |
Acrostylia
| Frapp. ex Cordem. | Fl. Réunion 227 | 1895 |
| Orchidaceae | |
Ada
| Lindl. | Fol. Orchid. Ada 1(5): Ada | 1853 [1854] |
| Orchidaceae | |
× Adacidiglossum
| J.M.H. Shaw | Orchid Rev. Suppl., 115(1276): 18 | 2007 |
| Orchidaceae | |
× Adacidium
| auct. | Orchid Rev. 98(1157): cppo: 12 | 1990 |
| Orchidaceae | |
Adactylus
| (Endl.) Rolfe | Orchid Rev. 4: 329 | 1896 |
| Orchidaceae | |
Adaglossum
| R.H. Torr. | Orchid Rev. 21: 298 | 1913 |
| Orchidaceae | |
× Adaglossum
| auct. | Orchid Rev. 21: 298 | 1913 |
| Orchidaceae | |
Adamanthus
| Szlach. | Richardiana 7(1): 30 | 2007 [2006] |
| Orchidaceae | |
Adamantinia
| Van den Berg & C.N. Gonç. | Orchid Digest 68(4): 231–232, figs. | 2004 |
| Orchidaceae | |
Adamara
| Cogn. | Bull. Soc. Roy. Bot. Belgique 47: 402 | 1911 |
| Orchidaceae | |
× Adapasia
| auct. | Orchid Rev. 105(1217): 318 | 1997 |
| Orchidaceae | |
Adelopetalum
| Fitzg. | J. Bot. 29: 152 | 1891 |
| Orchidaceae | |
Adeneleuterophora
| Barb. Rodr. | Gen. Sp. Orchid. 2: 170 | 1882 |
| Orchidaceae | |
Adeneleuthera
| Kuntze | Lex. Gen. Phan. 9 | 1903 |
| Orchidaceae | |
Adenochilus
| Hook. f. | Fl. Nov.-Zel. 1: 246 | 1853 |
| Orchidaceae | |
Adenoncos
| Blume | Bijdr. Fl. Ned. Ind. (6): 381 | 1825 |
| Orchidaceae | |
Adenostylis
| Blume | Bijdr. Fl. Ned. Ind. (8): 414 | 1825 |
| Orchidaceae | |
Adioda
| hort. | Orchid Rev. 19: 258 | 1911 |
| Orchidaceae | |
× Adioda
| auct. | Orchid Rev. 19: 258 | 1911 |
| Orchidaceae | |
Adipe
| Raf. | Fl. Tellur. 2: 101 | 1836 [1837] |
| Orchidaceae | |
Adnula
| Raf. | Fl. Tellur. 2: 87 | 1836 [1837] |
| Orchidaceae | |
Adoglossum
| R.H. Torr. | Orchid Rev. 21: 298 | 1913 |
| Orchidaceae | |
Adrorhizon
| Hook. f. | Handb. Fl. Ceylon 4: 161 | 1898 |
| Orchidaceae | |
Aenhenrya
| Gopalan | J. Bombay Nat. Hist. Soc. 90(2): 270 | 1993 [1994] |
| Orchidaceae | * |
Aenigma
| (Luer) Szlach. & Kolan. | Diversity (Basel) 14(5, 372): 23 | 2022 |
| Orchidaceae | *** |
Aeonia
| Lindl. | Bot. Reg. 8: sub t. 817 | 1824 |
| Orchidaceae | |
× Aerangaeris
| auct. | Orchid Rev. 109: 13 | 2001 |
| Orchidaceae | |
Aerangis
| Rchb. f. | Flora 48: 190 | 1865 |
| Orchidaceae | |
Aeranthes
| Lindl. | Bot. Reg. 10: , t. 817 | 1824 |
| Orchidaceae | ** |
Aeranthus
| Lindl. | Syst. Veg. [Sprengel] 3: 679 | 1826 |
| Orchidaceae | |
× Aerasconetia
| auct. | Orchid Rev. 86(1016) cppo: 8 | 1978 |
| Orchidaceae | |
Aeridachnanthe
| Garay & H.R. Sweet | Orch. Hybrid. List 489. 552 | 1974 |
| Orchidaceae | |
× Aeridachnanthe
| Garay & H.R. Sweet | Orchids: Sci. Stud. 489 | 1974 |
| Orchidaceae | |
× Aeridachnis
| auct. | Orchid J. 3: 165 | 1954 |
| Orchidaceae | |
Aeridachnis
| hort. | Orchid J. 3: 165 | 1954 |
| Orchidaceae | |
Aeridanthe
| Garay & H.R. Sweet | Bot. Mus. Leafl. 21: 148 | 1966 |
| Orchidaceae | ! |
Aerides
| Lour. | Fl. Cochinch. 2: 525 | 1790 |
| Orchidaceae | |
Aeridisia
| hort. | Orchid Rev. 82(976): ix | 1974 |
| Orchidaceae | |
× Aeridisia
| auct. | Orchid Rev. 82(976) cppo: 9 | 1974 |
| Orchidaceae | |
Aeriditis
| hort. | Orchid Rev. 81(957): x | 1973 |
| Orchidaceae | |
× Aeriditis
| auct. | Orchid Rev. 81(957) cppo: 7 | 1973 |
| Orchidaceae | |
Aeridium
| Pfeiff. | Nomencl. Bot. 1(1): 67 | 1873 |
| Orchidaceae | ** |
Aeridium
| Salisb. | Trans. Hort. Soc. London 1: 295 | 1812 |
| Orchidaceae | |
Aeridocentrum
| hort. | Orchid Rev. 75: | 1967 |
| Orchidaceae | |
× Aeridocentrum
| auct. | Orchid Rev. 74(884): noh: 1 | 1967 |
| Orchidaceae | |
Aeridochilus
| hort. | Orchid Rev. 84(995): x | 1976 |
| Orchidaceae | |
× Aeridochilus
| auct. | Orchid Rev. 84(994) cppo: 10 | 1976 |
| Orchidaceae | |
Aeridofinetia
| hort. | Orchid Rev. 69: 267 | 1961 |
| Orchidaceae | |
× Aeridofinetia
| auct. | Orchid Rev. 69: 267 | 1961 |
| Orchidaceae | |
Aeridoglossum
| hort. | Orchid Rev. 71: | 1963 |
| Orchidaceae | |
× Aeridoglossum
| auct. | Orchid Rev. 71(843) noh: 1 | 1963 |