| Astragalus filipes var. residuus Jeps., 1925 |
| Astragalus flexuosus Douglas ex G. Don, 1832 |
| Astragalus flexuosus var. greenei (A. Gray) Barneby, 1960 |
| Astragalus francisquitensis M.E. Jones, 1895 |
| Astragalus francisquitensis var. lagunensis (M.E. Jones) M.E. Jones, 1902 |
| Astragalus galegoides Nutt., 1818 |
| Astragalus gambelianus E. Sheld., 1894 |
| Astragalus gentryi Standl., 1940 |
| Astragalus giganteus S. Watson, 1882 |
| Astragalus giganteus var. yaquianus (S. Watson) M.E. Jones, 1923 |
| Astragalus goldmanii M.E. Jones, 1923 |
| Astragalus gooddingii (Rydb.) Tidestr., 1935 |
| Astragalus gracilentus (A. Gray) A. Gray, 1864 |
| Astragalus greenei A. Gray, 1881 |
| Astragalus greggii S. Watson, 1882 |
| Astragalus gruinus Barneby, 1964 |
| Astragalus guanajuatensis Rzed. & Calderón, 2015 |
| Astragalus guatemalensis Hemsl., 1879 |
| Astragalus guatemalensis var. brevidentatus (Hemsl.) Barneby, 1964 |
| Astragalus guatemalensis var. guatemalensis Hemsl., 1879 |