| United States | | | Williams, M. C. & R. C. Barneby | 1977 | The Occurrence of Nitro-toxins in North America Astragalus (Fabaceae) | Brittonia | 29(3): 310–326 |
| United States | | | Anonymous | 1986 | (none) | List-Based Rec., Soil Conserv. Serv., U.S.D.A. | |
| United States | | | Cronquist, A. J., A. H. Holmgren, N. H. Holmgren, Reveal & P. K. Holmgren | 1989 | Vascular Plants of the Intermountain West, U.S.A., FABALES | Intermount. Fl. | 3B: 1–279 |
| United States | Arizona | | Cronquist, A. J., A. H. Holmgren, N. H. Holmgren, Reveal & P. K. Holmgren | 1989 | Vascular Plants of the Intermountain West, U.S.A., FABALES | Intermount. Fl. | 3B: 1–279 |
| United States | Idaho | | Cronquist, A. J., A. H. Holmgren, N. H. Holmgren, Reveal & P. K. Holmgren | 1989 | Vascular Plants of the Intermountain West, U.S.A., FABALES | Intermount. Fl. | 3B: 1–279 |
| United States | Nevada | | Cronquist, A. J., A. H. Holmgren, N. H. Holmgren, Reveal & P. K. Holmgren | 1989 | Vascular Plants of the Intermountain West, U.S.A., FABALES | Intermount. Fl. | 3B: 1–279 |
| United States | Oregon | | Williams, M. C. & R. C. Barneby | 1977 | The Occurrence of Nitro-toxins in North America Astragalus (Fabaceae) | Brittonia | 29(3): 310–326 |
| United States | Oregon | | Cronquist, A. J., A. H. Holmgren, N. H. Holmgren, Reveal & P. K. Holmgren | 1989 | Vascular Plants of the Intermountain West, U.S.A., FABALES | Intermount. Fl. | 3B: 1–279 |
| United States | Utah | | Cronquist, A. J., A. H. Holmgren, N. H. Holmgren, Reveal & P. K. Holmgren | 1989 | Vascular Plants of the Intermountain West, U.S.A., FABALES | Intermount. Fl. | 3B: 1–279 |