Echinocactus polycephalus Engelm. & J.M.Bigelow
no HD illustration available (m1)
Echinocactus polycephalus Engelm. & J.M.Bigelow [Cactaceae]
T. Meehan, Native Fl. Ferns U.S., vol. 2 : p. 129, t. 33 (1878-1879)