Mammillaria slevinii (Britton & Rose) Boed., Mammill.-Vergl.-Schluessel: 44. 1933 Mammillaria slevinii (Britton & Rose) Boed., Mammill.-Vergl.-Schluessel: 44. 1933is new combination for Neomammillaria slevinii Britton & Rose, Cactaceae 4: 139–140, f. 153. 1923Taxon for this nameMammillaria slevinii (Britton & Rose) Boed.