≡ Echinocactus acanthodes Lemaire (1922)
= Ferocactus cylindraceus (Engelm.) Orcutt (1926) (*) = Echinocactus cylindraceus (Engelm.) Engelm. (1856) = Echinocactus viridescens v. cylindraceus Engelm. (1852) = Ferocactus acanthodes v. rostii (Britton & Rose) W.T. Marshall & T.M. Bock (1941) = Ferocactus rostii Britton & Rose (1922) = Ferocactus cylindraceus ssp. eastwoodiae (L.D. Benson) N.P. Taylor (2002) = Ferocactus cylindraceus v. eastwoodiae (L.D. Benson) N.P. Taylor (1984) = Ferocactus eastwoodiae (L.D. Benson) L.D. Benson (1982) = Ferocactus acanthodes v. eastwoodiae L.D. Benson (1969)
