Mammillaria backebergiana var. ernestii (Fittkau) Glass & R.A.Foster in Cact. Succ. J. (Los Angeles) 51: 126. 1979
Mammillaria backebergiana var. ernestii in Cact. Succ. J. (Los Angeles) 51: 126. 1979
is new combination for Mammillaria ernestii in Cact. Suc. Mex. 16(2): 36. 1971