| Name | Mammillaria heyderi var. hemisphaerica Engelmann |
| Authorship | Engelmann |
| Rank | Variety |
| NomenclaturalStatus | NomLeg |
| Placed in | Mammillaria heyderi Muehlenpfordt |
| GUID | urn:lsid:ipni.org:names:151106-2 |
| Holdings | 4 Specimens held in the Harvard University Herbaria identified as Mammillaria heyderi var. hemisphaerica Engelmann |
| Identification made in | [no date] (4) |
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