| Name | Mammillaria heyderi var. bullingtonia Castetter, P. Pierce & K. H. Schwer. |
| Authorship | Castetter, P. Pierce & K. H. Schwer. |
| Rank | Variety |
| Placed in | Mammillaria heyderi Muehlenpfordt |
| Citation | 1976 Cact. Succ. J. (Los Angeles) 48(3): 138–139, f. 1–2 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Mammillaria heyderi var. bullingtonia Castetter, P. Pierce & K. H. Schwer. |
| Identification made in | [no date] (1) |
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