protologue: Trans. Acad. Sci. St. Louis 2: 197 (1863)
2 369608 Echinocactus simpsonii Engelm.The Garden, vol. 11 : t. 68 (1877)
2 369608 Echinocactus simpsonii Engelm.G. Engelmann, see 309: t. 1 (1876) [P. Roetter]
2 369608 Echinocactus simpsonii Engelm.G. Engelmann, see 309: t. 2 (1876) [P. Roetter]
2 369608 Echinocactus simpsonii Engelm.C.F. Förster, T. Rümpler, Handb. Cacteenk., ed. 2, vol. 2 : t. 76 (1886)
2 369608 Echinocactus simpsonii Engelm.G. Engelmann, Rep. Bot. Exped. Capt. Simpson Utah: t. 1 (1876) [P. Roetter]
2 369608 Echinocactus simpsonii Engelm.G. Engelmann, Rep. Bot. Exped. Capt. Simpson Utah: t. 2 (1876) [P. Roetter]