Neomammillaria tetracantha (Salm-Dyck ex Pfeiff.) Britton & Rose, Cactaceae 4: 106–107, f. 108. 1923 Neomammillaria tetracantha (Salm-Dyck ex Pfeiff.) Britton & Rose, Cactaceae 4: 106–107, f. 108. 1923is new combination for Mammillaria tetracantha Salm-Dyck ex Pfeiff., Enum. Diagn. Cact.: 18. 1837Taxon for this nameNeomammillaria tetracantha (Salm-Dyck ex Pfeiff.) Britton & Rose