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