Mammillaria incerta Parish, Fl. Calif. 2: 549. 1936
Mammillaria incerta, Fl. Calif. 2: 549. 1936
is basionym for Mammillaria dioica var. incerta, Aliso 4(1): 94. 1958
is basionym for Mammillaria dioica f. incerta in Succulenta (Netherlands) 65: 119. 1986