Cactus missouriensis var. similis (Engelm.) J.M.Coult. in Contr. U.S. Natl. Herb. 3: 111. 1894
Cactus missouriensis var. similis in Contr. U.S. Natl. Herb. 3: 111. 1894
is new combination for Mammillaria similis in Boston J. Nat. Hist. 5(2): 246. 1845