Mammillaria grahamii subsp. sheldonii (Britton & Rose) D.R.Hunt in Cactaceae Syst. Init. 20: 21. 2005
Mammillaria grahamii subsp. sheldonii in Cactaceae Syst. Init. 20: 21. 2005
is new combination for Neomammillaria sheldonii, Cactaceae 4: 156–157, f. 175. 1923