Gymnocalycium millaresii Cárdenas in Cact. Succ. J. (Los Angeles) 38: 144. 1966
Gymnocalycium millaresii in Cact. Succ. J. (Los Angeles) 38: 144. 1966
is basionym for Gymnocalycium pflanzii var. millaresii in Natl. Cact. Succ. J. 26: 100. 1971
is basionym for Gymnocalycium zegarrae subsp. millaresii in Gymnocalycium 13: 355. 2000