Ferocactus acanthodes subsp. tortulispinus Ferocactus acanthodes subsp. eastwoodiae Ferocactus acanthodes subsp. lecontei Ferocactus acanthodes subsp. acanthodes
Ferocactus cylindraceus Ferocactus rostii Ferocactus cylindraceus subsp. cylindraceus Echinocactus copoldi Ferocactus cylindraceus var. cylindraceus Echinocactus acanthodes Echinocactus acanthodes var. rostii Echinocactus leopoldii Echinocactus rostii Echinocactus viridescens var. cylindraceus Ferocactus acanthodes var. rostii Ferocactus acanthodes subsp. rostii
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024