Echinocactus bicolor Galeotti ex Pfeiff., Abbild. Beschr. Cact. 2: t. 25. 1848
Echinocactus bicolor, Abbild. Beschr. Cact. 2: t. 25. 1848
is basionym for Thelocactus bicolor in Bull. Torrey Bot. Club 49: 251. 1922
is basionym for Ferocactus bicolor in Cact. Succ. J. Gr. Brit. 41: 30. 1979