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CCDB → Angiosperms → Cactaceae → Mammillaria → Mammillaria microcarpa Engelm.
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| Mammillaria microcarpa Engelm. | Mammillaria grahamii Engelm. | 11 | IPCN online | Pinkava, D. J., L. A. MCGILL & T. REEVES. 1977. Chromosome numbers in some cacti of western North America---III. Bull. Torrey Bot. Club 104: 105–110. | |||
| Mammillaria microcarpa Engelm. | Mammillaria grahamii Engelm. | 11 | IPCN75-78 | Pinkava et al. 1977 | |||
| Mammillaria microcarpa Engelm. | Mammillaria grahamii Engelm. | 22 | Fedorov, 1974 | Remski 1954 |