| Anneslia schottii (Torr. ex S. Watson) Britton & Rose, 1928 |
| Anonymos Walter, 1788 |
| Anonymos capitatus Walter, 1788 |
| Anonymos rotundifolia Walter, 1788 |
| Anonymos sagittalis Walter, 1788 |
| Anonymos umbrosa Walter, 1788 |
| Apoplanesia C. Presl, 1831 |
| Apoplanesia paniculata C. Presl, 1831 |
| Arachis L., 1753 |
| Arachis hypogaea L., 1753 |
| Aragallus Neck. ex Greene, 1897 |
| Aragallus nothoxys (A. Gray) A. Heller, 1898 |
| Arcyphyllum Elliott, 1818 |
| Arouna Aubl., 1775 |
| Arouna divaricata Willd., 1797 |
| Arouna guianensis Aubl., 1775 |
| Astragalus L., 1753 |
| Astragalus acutirostris S. Watson, 1885 |
| Astragalus agninus Jeps., 1925 |
| Astragalus albatus E. Sheld., 1894 |