| Asclepias woodsoniana Standl. & Steyerm., 1947 |
| Asclepias wrightii Greene ex A. Gray, 1881 |
| Asclepias zanthodacryon (L.B. Sm.) Woodson, 1941 |
| Aspidosperma Mart. & Zucc., 1824 |
| Aspidosperma chiapense Matuda, 1950 |
| Aspidosperma cruentum Woodson, 1935 |
| Aspidosperma desmanthum Benth. ex Müll. Arg., 1860 |
| Aspidosperma matudae Lundell, 1939 |
| Aspidosperma megalocarpon Müll. Arg., 1860 |
| Aspidosperma megalocarpon subsp. megalocarpon Müll. Arg., 1860 |
| Aspidosperma spruceanum Benth. ex Müll. Arg., 1860 |
| Aspidosperma stegomeris (Woodson) Woodson, 1951 |
| Aspidospermateae Miers, 1878 |
| Astephaninae Endl. ex Meisn., 1840 |
| Astephanus R. Br., 1810 |
| Astephanus mucronatus Schltdl., 1833 |
| Astephanus pubescens Greenm., 1897 |
| Basistelma Bartlett, 1909 |
| Basistelma mexicanum (Brandegee) Bartlett, 1909 |
| Beaumontia Wall., 1824 |