| Astragalus hidalgensis (Rydb.) Barneby, 1964 |
| Astragalus hidalgensis var. protensus Barneby, 1964 |
| Astragalus hintonii Barneby, 1964 |
| Astragalus hintonii var. cofrensis Barneby, 1964 |
| Astragalus hintonii var. hintonii Barneby, 1964 |
| Astragalus hookerianus D. Dietr., 1847 |
| Astragalus hornii A. Gray, 1868 |
| Astragalus hornii var. minutiflorus M.E. Jones, 1895 |
| Astragalus humboldtii A. Gray, 1864 |
| Astragalus humistratus A. Gray, 1853 |
| Astragalus humistratus var. humistratus A. Gray, 1853 |
| Astragalus humistratus var. sonorae (A. Gray) M.E. Jones, 1902 |
| Astragalus hypoleucus S. Schauer, 1847 |
| Astragalus hypoxylus S. Watson, 1883 |
| Astragalus idrietorum Barneby, 1964 |
| Astragalus insularis Kellogg, 1884 |
| Astragalus insularis var. harwoodii Munz & McBurney, 1932 |
| Astragalus insularis var. insularis Kellogg, 1884 |
| Astragalus insularis var. quentinus M.E. Jones, 1898 |
| Astragalus irolanus (M.E. Jones) Rydb., 1929 |