Mammillaria dioica f. incerta (Parish) Neutel. in Succulenta (Netherlands) 65: 119. 1986 Mammillaria dioica f. incerta (Parish) Neutel. in Succulenta (Netherlands) 65: 119. 1986is new combination for Mammillaria incerta Parish, Fl. Calif. 2: 549. 1936Taxon for this nameMammillaria dioica f. incerta (Parish) Neutel.