| Name | Melocactus harlowii (Britton & Rose) Vaupel |
| Authorship | (Britton & Rose) Vaupel |
| Rank | Species |
| Placed in | Melocactus |
| Citation | 1912 Monatsschr. Kakteenk. 22: 66 |
| Holdings | 3 Specimens held in the Harvard University Herbaria identified as Melocactus harlowii (Britton & Rose) Vaupel |
| Identification made in | [no date] (3) |
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