| Name | Astragalus williamsii Rydberg |
| Authorship | Rydberg |
| Rank | Species |
| Placed in | Astragalus Linnaeus |
| Citation | 1901 Bull. New York Bot. Gard. 2(6): 175 |
| Holdings | 13 Specimens held in the Harvard University Herbaria identified as Astragalus williamsii Rydberg |
| Identification made in | [no date] (11), 1962 (2) |
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