| Acmispon rigidus (Benth.) Brouillet, 2008 |
| Acmispon strigosus (Nutt.) Brouillet, 2008 |
| Acmispon strigosus var. tomentellus (Greene) Brouillet, 2020 |
| Acmispon tomentosus (Hook. & Arn.) Govaerts, 2018 |
| Acmispon watsonii (Vasey & Rose) Brouillet, 2020 |
| Acmispon wrightii (A. Gray) Brouillet, 2008 |
| Acosmium Schott, 1827 |
| Acosmium panamense (Benth.) Yakovlev, 1969 |
| Acrocarpus Wight & Arn., 1838 |
| Acrocarpus fraxinifolius Wight & Arn., 1838 |
| Acrocarpus fraxinifolius var. guangxiensis S.L. Mo & Y. Wei, 1980 |
| Acuan Medik., 1786 |
| Acuan latum Britton & Rose, 1928 |
| Acuan virgatum (L.) Medik., 1786 |
| Adenopodia C. Presl, 1851 |
| Adenopodia gymnantha Brenan, 1986 |
| Adenopodia oaxacana M. Sousa, 1986 |
| Adenopodia patens (Hook. & Arn.) J.R. Dixon ex Brennan, 1986 |
| Adenopodia polystachya (L.) J.R. Dixon ex Croat, 1978 |
| Adesmia DC., 1825 |