Mammillaria mutabilis var. laevior Salm-Dyck, Cact. Hort. Dyck., ed. 1844: 120. 1845 Mammillaria mutabilis var. laevior Salm-Dyck, Cact. Hort. Dyck., ed. 1844: 120. 1845Taxon for this nameMammillaria mutabilis var. laevior Salm-Dyck