| Name | Pediocactus simpsonii (Engelmann) Britton & Rose |
| Authorship | (Engelmann) Britton & Rose |
| Rank | Species |
| Placed in | Pediocactus |
| Contains | Pediocactus simpsonii var. minor (Engelmann) Cockerell Pediocactus simpsonii var. nigrispinus F. Hochstätter |
| Citation | 1913 Ill. Fl. N. U.S. [Britton & Brown], ed. 2. 2: 570 |
| Holdings | 4 Specimens held in the Harvard University Herbaria identified as Pediocactus simpsonii (Engelmann) Britton & Rose |
| Identification made in | [no date] (4) |
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