| Name | Hamatocactus hamatacanthus (Muehlenpfordt) F. M. Knuth |
| Authorship | (Muehlenpfordt) F. M. Knuth |
| Rank | Species |
| Placed in | Hamatocactus Britton & Rose |
| Citation | 1936. (12 Feb 1936) Kaktus-ABC [Backeb. & Knuth] 353 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Hamatocactus hamatacanthus (Muehlenpfordt) F. M. Knuth |
| Identification made in | [no date] (1) |
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