≡ Ferocactus bicolor (Galeotti ex Pfeiff.) N.P. Taylor (1979) ≡ Echinocactus bicolor Galeotti ex Pfeiff. (1848)
= Thelocactus bicolor ssp. zwakii Chvastek & Halda (2000) = Thelocactus bicolor ssp. commodus (R.Haas) Doweld (1999) = Thelocactus bicolor v. commodus R. Haas (1988) = Thelocactus bicolor v. pottsii (Salm-Dyck) Backeb. (1961) = Echinocactus bicolor v. pottsii Salm-Dyck (1850) = Thelocactus schottii (Engelm.) Kladiwa & Fittkau (1975) = Thelocactus bicolor v. schottii (Engelm.) Krainz (1961) = Echinocactus bicolor v. schottii Engelm. (1856) = Thelocactus bicolor v. tricolor (K. Schum.) Y. Ito (1952) = Echinocactus bicolor v. tricolor K. Schum. (1898) = Thelocactus bicolor v. wagnerianus (A. Berger) Krainz (1961) = Echinocactus wagnerianus A. Berger (1929) = Thelocactus wagnerianus A. Berger (1929)
