Escobaria missouriensis var. robustior (Engelm.) D.R.Hunt in Cact. Succ. J. Gr. Brit. 40: 13. 1978
Escobaria missouriensis var. robustior in Cact. Succ. J. Gr. Brit. 40: 13. 1978
is new combination for Mammillaria similis var. robustior in Boston J. Nat. Hist. 6: 200. 1850