Ferocactus cylindraceus (Engelm.) Orcutt Ferocactus cylindraceus (Engelm.) Orcutt, Cactography 5. 1926 sec. Guzmán & al. 2003≡Echinocactus viridescens var. cylindraceus Engelm. in Amer. J. Sci. Arts, ser. 2, 14: 338. 1852 syn. sec. Guzmán & al. 2003