| Name | Thelocactus bicolor (Galeotti ex Pfeiffer) Britton & Rose |
| Authorship | (Galeotti ex Pfeiffer) Britton & Rose |
| Rank | Species |
| Placed in | Thelocactus |
| Contains | Thelocactus bicolor var. pottsii (Salm-Dyck) Backeberg Thelocactus bicolor var. schottii (Engelmann) Krainz |
| Citation | 1922 Bull. Torrey Bot. Club 49(8): 251 |
| Holdings | 5 Specimens held in the Harvard University Herbaria identified as Thelocactus bicolor (Galeotti ex Pfeiffer) Britton & Rose |
| Identification made in | [no date] (5) |