Thelocactus viereckii var. major (Glass & R.A.Foster) Bravo in Cact. Suc. Mex. 25: 65. 1980
Thelocactus viereckii var. major in Cact. Suc. Mex. 25: 65. 1980
is new combination for Gymnocactus viereckii var. major in Cact. Succ. J. (Los Angeles) 50: 285. 1978