| 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 |
| Astragalus allochrous A. Gray, 1878 |
| Astragalus allochrous var. playanus M.E. Jones, 1998 |
| Astragalus alpinus L., 1753 |
| Astragalus alpinus var. giganteus Pall., 1753 |
| Astragalus amphioxys A. Gray, 1878 |
| Astragalus anemophilus Greene, 1886 |
| Astragalus angelinus M.E. Jones, 1923 |
| Astragalus antoninus S. Watson, 1882 |
| Astragalus apertus E. Sheld., 1894 |
| Astragalus aridus A. Gray, 1864 |