| Acerates Elliott, 1817 |
| Acerates asperula Decne., 1844 |
| Acerates circinalis Decne., 1838 |
| Acerates pringlei Greenm., 1899 |
| Acerates vinosa E. Fourn., 1882 |
| Acerates viridiflora (Raf.) Eaton, 1829 |
| Adenium Roem. & Schult., 1819 |
| Adenium obesum (Forssk.) Roem. & Schult., 1819 |
| Allamanda L., 1771 |
| Allamanda cathartica L., 1771 |
| Allamanda schottii Pohl, 1827 |
| Allamandinae A. DC., 1844 |
| Allotoonia J.F. Morales & J.K. Williams, 2004 |
| Allotoonia parviflora J.F. Morales & J.K. Williams, 2004 |
| Allotoonia turbinata (Woodson) J.F. Morales & J.K. Williams, 2004 |
| Allotoonia tuxtlensis (Standl.) J.F. Morales & J.K. Williams, 2004 |
| Allotoonia woodsoniana (Monach.) J.F. Morales & J.K. Williams, 2005 |
| Alstonia R. Br., 1810 |
| Alstonia ciliata Benth., 1840 |
| Alstonia longifolia (A. DC.) Pichon, 1947 |