Mammillaria dioica var. incerta (Parish) Munz, Aliso 4(1): 94. 1958 Mammillaria dioica var. incerta (Parish) Munz, Aliso 4(1): 94. 1958is new combination for Mammillaria incerta Parish, Fl. Calif. 2: 549. 1936Taxon for this nameMammillaria dioica var. incerta (Parish) Munz