Thelocactus schwarzii Backeb. in Cact. Succ. J. Gr. Brit. 12: 81. 1950
Thelocactus schwarzii in Cact. Succ. J. Gr. Brit. 12: 81. 1950
is basionym for Thelocactus bicolor subsp. schwarzii in Cactaceae Consensus Init. 5: 14. 1998
is basionym for Ferocactus bicolor var. schwarzii in Cact. Succ. J. Gr. Brit. 41: 30. 1979
is basionym for Thelocactus bicolor var. schwarzii in Bradleya 5: 61. 1987