Opuntia macrorhiza Engelm. [ Opuntia tortispina Engelm. & J.M. Bigelow]
no HD illustration available (m1)
Opuntia macrorhiza Engelm. [Cactaceae]
J. Torrey, Pacif. Railr. Rep., vol. 4 fasicle 3, : t. 8 (1853-1856) [P. Roetter]