| 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 |
| Astragalus guatemalensis var. lozani M.E. Jones, 1929 |
| Astragalus guatemalensis var. oaxacanus M.E. Jones, 1923 |
| Astragalus harbisonii Barneby, 1953 |
| Astragalus harshbergeri (Rydb.) A.E. Estrada, Villarreal & A. Delgado, 2020 |
| Astragalus hartmanii Rydb., 1929 |
| Astragalus hartwegii Benth., 1839 |
| Astragalus hartwegii f. pringlei Gand., 1902 |
| Astragalus harwoodii (Munz & McBurney) Abrams, 1944 |
| Astragalus helleri Fenzl, 1860 |