Records: 1,576,062

• Aa Rchb.f. [accepted]
• Aa subgen. Myrosmodes (Rchb.f.) Schltr. [unplaced]
• Aa achalensis Schltr. [accepted]
• Aa argyrolepis Rchb.f. [accepted]
• Aa aurantiaca D.Trujillo [accepted]
• Aa brevis Schltr. [synonym]
• Aa calceata (Rchb.f.) Schltr. [accepted]
• Aa chiogena Schltr. [synonym]
• Aa colombiana Schltr. [accepted]
• Aa denticulata Schltr. [accepted]
• Aa erosa (Rchb.f.) Schltr. [accepted]
• Aa fiebrigii (Schltr.) Schltr. [accepted]
• Aa figueroi Szlach. & S.Nowak [accepted]
• Aa filamentosa Mansf. [synonym]
• Aa gymnandra (Rchb.f.) Schltr. [synonym]
• Aa hartwegii Garay [synonym]
• Aa hieronymi (Cogn.) Schltr. [accepted]
• Aa inaequalis (Rchb.f.) Schltr. [synonym]
• Aa lechleri Schltr. [synonym]
• Aa lehmannii Rchb.f. ex Szlach. & Kolan. [accepted]
• Aa leucantha (Rchb.f.) Schltr. [accepted]
• Aa lorentzii Schltr. [accepted]
• Aa lozanoi Szlach. & S.Nowak [accepted]
• Aa macra Schltr. [accepted]
• Aa maderoi Schltr. [accepted]
• Aa mandonii (Rchb.f.) Schltr. [accepted]
• Aa matthewsii (Rchb.f.) Schltr. [accepted]
• Aa microtidis Schltr. [accepted]
• Aa nervosa (Kraenzl.) Schltr. [synonym]
• Aa nigrescens Schltr. [synonym]
• Aa nubigena (Rchb.f.) Schltr. [synonym]
• Aa paleacea (Kunth) Rchb.f. [accepted]
• Aa paludosa (Rchb.f.) Schltr. [synonym]
• Aa pumilio Schltr. [synonym]
• Aa rhynchocarpa Schltr. [synonym]
• Aa riobambae Schltr. [accepted]
• Aa rosei Ames [accepted]
• Aa rostrata (Rchb.f.) Schltr. [synonym]
• Aa schickendanzii Schltr. [accepted]
• Aa sphaeroglossa Schltr. [accepted]
• Aa tenebrosa C.M.Martín & Scrocchi [unplaced]
• Aa trilobulata Schltr. [accepted]
• Aa ustulata Schltr. [synonym]
• Aa weberbaueri Schltr. [synonym]
• Aa weddelliana (Rchb.f.) Schltr. [accepted]
• Aakia J.R.Grande [accepted]
• Aakia tuerckheimii (Hack.) J.R.Grande [accepted]
• Aalius Lam. ex Kuntze [synonym]
• Aalius androgyna (L.) Kuntze [synonym]
• Aalius assimilis (Thwaites) Kuntze [synonym]
• Aalius brevipes (Müll.Arg.) Kuntze [synonym]
• Aalius ceratogynum (Baill.) Kuntze [synonym]
• Aalius compressa (Müll.Arg.) Kuntze [synonym]
• Aalius forcipata (Hook.f.) Kuntze [synonym]
• Aalius lanceolata (Hook.f.) Kuntze [synonym]
• Aalius macrantha (Hassk.) Kuntze [synonym]
• Aalius macrophylla (Hook.f.) Kuntze [synonym]
• Aalius oblongifolia (Hook.f.) Kuntze [synonym]
• Aalius pubescens (Hook.f.) Kuntze [synonym]
• Aalius quadrangularis (Müll.Arg.) Kuntze [synonym]
• Aalius retroversa (Wight) Kuntze [synonym]
• Aalius rhamnodes (Blume) Kuntze [synonym]
• Aalius rigida (Thwaites) Kuntze [synonym]
• Aalius rostrata (Miq.) Kuntze [synonym]
• Aalius spectabilis (Miq.) Kuntze [synonym]
• Aalius stipitata (Hook.f.) Kuntze [synonym]
• Aalius sumatrana (Miq.) Kuntze [synonym]
• Aalius trinervia (Hook.f. & Thomson ex Müll.Arg.) Kuntze [unplaced]
• Aaronsohnia Warb. & Eig [accepted]
• Aaronsohnia factorovskyi Warb. & Eig [accepted]
• Aaronsohnia factorovskyi var. brachyota Warb. & Eig [unplaced]
• Aaronsohnia pubescens (Desf.) K.Bremer & Humphries [accepted]
• Aaronsohnia pubescens subsp. maroccana (Ball) Förther & Podlech [synonym]
• Aaronsohnia pubescens subsp. maroccana (Ball) Fennane & Ibn Tattou [accepted]
• Aaronsohnia pubescens subsp. pubescens [accepted]
• Abacopterella T.E.Almeida & A.R.Field [unplaced]
• Abacopterella altifrons T.E.Almeida & A.R.Field [unplaced]
• Abacopteris Fée [synonym]
• Abacopteris anjenabensis Tardieu [synonym]
• Abacopteris aspera (C.Presl) Ching [synonym]
• Abacopteris birii (R.D.Dixit & Balkr.) S.E.Fawc. & A.R.Sm. [unplaced]
• Abacopteris cuspidata (Blume) Ching [synonym]
• Abacopteris elegans Fée [unplaced]
• Abacopteris gardneri (Holttum) S.E.Fawc. & A.R.Sm. [unplaced]
• Abacopteris glandulosa (Blume) Fée [synonym]
• Abacopteris gracilis (Ching ex Y.X.Lin) S.E.Fawc. & A.R.Sm. [unplaced]
• Abacopteris gymnopteridifrons (Hayata) Ching [synonym]
• Abacopteris hekouensis (Ching ex Y.X.Lin) S.E.Fawc. & A.R.Sm. [unplaced]
• Abacopteris hirtisora (C.Chr.) S.E.Fawc. & A.R.Sm. [unplaced]
• Abacopteris holophylla (C.Chr.) Ching [synonym]
• Abacopteris insularis K.Iwats. [synonym]
• Abacopteris lakhimpurensis (Rosenst.) Ching [synonym]
• Abacopteris letouzeyi Tardieu [synonym]
• Abacopteris lineata (Blume) Fée ex Ching [synonym]
• Abacopteris liukiuensis (Christ ex Matsum.) Tagawa [synonym]
• Abacopteris longipetiolata K.Iwats. [synonym]
• Abacopteris macrophylla (Ching ex Y.X.Lin) S.E.Fawc. & A.R.Sm. [unplaced]
• Abacopteris megacuspis (Baker) Ching [synonym]
• Abacopteris menisciicarpa (Blume) Holttum [synonym]
• Abacopteris multilineata (Wall. ex Hook.) Ching [synonym]