Mammillaria xanthotricha var. laevior Salm-Dyck, Cact. Hort. Dyck., ed. 1844: 11. 1845 Mammillaria xanthotricha var. laevior Salm-Dyck, Cact. Hort. Dyck., ed. 1844: 11. 1845Taxon for this nameMammillaria xanthotricha var. laevior Salm-Dyck