Sulcorebutia steinbachii subsp. verticillacantha (F.Ritter) Fritz, Gertel & J.de Vries in Cactus & Co. 8(3): 189. 2004
Sulcorebutia steinbachii subsp. verticillacantha in Cactus & Co. 8(3): 189. 2004
is new combination for Sulcorebutia verticillacantha in Natl. Cact. Succ. J. 17(1): 13. 1962