Echinocactus viridescens var. cylindraceus Engelm. in Amer. J. Sci. Arts, ser. 2, 14: 338. 1852 Echinocactus viridescens var. cylindraceus Engelm. in Amer. J. Sci. Arts, ser. 2, 14: 338. 1852is basionym for Ferocactus cylindraceus (Engelm.) Orcutt in Cactography: 5. 1926Taxon for this nameEchinocactus viridescens var. cylindraceus Engelm.