| 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) |