Mammillaria sheldonii (Britton & Rose) Boed., Mammillarien-Vergleichs-Schluessel: 30. 1933 Mammillaria sheldonii (Britton & Rose) Boed., Mammillarien-Vergleichs-Schluessel: 30. 1933is new combination for Neomammillaria sheldonii Britton & Rose, Cactaceae 4: 156–157, f. 175. 1923Taxon for this nameMammillaria sheldonii (Britton & Rose) Boed.