Mammillaria pygmaea (Britton & Rose) A.Berger, Kakteen: 296. 1929 Mammillaria pygmaea (Britton & Rose) A.Berger, Kakteen: 296. 1929is new combination for Neomammillaria pygmaea Britton & Rose, Cactaceae 4: 142–143. 1923Taxon for this nameMammillaria pygmaea (Britton & Rose) A.Berger