Mammillaria scolymoides var. nigricans Salm-Dyck, Cact. Hort. Dyck., ed. 1849: 132. 1850 Mammillaria scolymoides var. nigricans Salm-Dyck, Cact. Hort. Dyck., ed. 1849: 132. 1850Taxon for this nameMammillaria scolymoides var. nigricans Salm-Dyck
