| Name | Lupinus diffusus Nuttall |
| Authorship | Nuttall |
| Rank | Species |
| Placed in | Lupinus Linnaeus |
| Citation | 1818 Gen. N. Amer. Pl. [Nuttall] 2: 93 |
| Holdings | 71 Specimens held in the Harvard University Herbaria identified as Lupinus diffusus Nuttall |
| Identification made in | [no date] (59), 1928 (5), 1956 (4), 1969 (1), 1999 (2) |
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