| Name | Melocactus obtusipetalus Lemaire |
| Authorship | Lemaire |
| Rank | Species |
| Placed in | Melocactus |
| Citation | 1838 Cact. Aliq. Nov. 11 |
| Holdings | 3 Specimens held in the Harvard University Herbaria identified as Melocactus obtusipetalus Lemaire |
| Identification made in | [no date] (3) |
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