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CCDB → Angiosperms → Cactaceae → Mammillaria → Mammillaria gracilis Pfeiff.
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| Mammillaria gracilis Pfeiff. | Mammillaria gracilis Pfeiff. | 22 | IPCN online | Johnson, W. C. 1980. Dendrochronological sampling of Pinus oocarpa Shiede near Copan, Honduras: a preliminary note. Biotropica 12: 315–316. | |||
| Mammillaria gracilis Pfeiff. | Mammillaria gracilis Pfeiff. | 11 | IPCN online | Gill, B. S. & V. Goyal. 1984. Cytology of some members of Cactaceae. Cell Chromosome Res. 7: 58–60. | |||
| ! | Mammillaria fragilis Salm-Dyck | Mammillaria gracilis Pfeiff. | 22 | Fedorov, 1974 | Katagiri 1953 | ||
| ! | Mammillaria fragilis Salm-Dyck | Mammillaria gracilis Pfeiff. | 22 | Fedorov, 1974 | Remski 1954 |