Mammillaria sempervivi var. caput-medusae (Otto ex Pfeiff.) Backeb., Cactaceae 5: 3160. 1961
Mammillaria sempervivi var. caput-medusae, Cactaceae 5: 3160. 1961
is new combination for Mammillaria caput-medusae, Enum. Diagn. Cact.: 22. 1837
Mammillaria sempervivi var. caput-medusae, Cactaceae 5: 3160. 1961
Taxon for this name