Mammillaria microcarpa var. sheldonii (Britton & Rose) Neutel. in Succulenta (Netherlands) 65: 3. 1986
Mammillaria microcarpa var. sheldonii in Succulenta (Netherlands) 65: 3. 1986
is new combination for Neomammillaria sheldonii, Cactaceae 4: 156–157, f. 175. 1923