Mammillaria microcarpa var. milleri (Britton & Rose) W.T.Marshall in Desert. Bot. Gard. Arizona, Sci. Bull. 1: 104. 1950
Mammillaria microcarpa var. milleri in Desert. Bot. Gard. Arizona, Sci. Bull. 1: 104. 1950
is new combination for Neomammillaria milleri, Cactaceae 4: 156, f. 184a. 1923