Opuntia cyclodes (Engelm. & J.M. Bigelow) Rose [ Opuntia engelmannii var. cyclodes Engelm. & J.M. Bigelow]
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Opuntia cyclodes (Engelm. & J.M. Bigelow) Rose [ Opuntia engelmannii var. cyclodes Engelm. & J.M. Bigelow] [Cactaceae]
J. Torrey, Pacif. Railr. Rep., vol. 4 fasicle 3, : t. 8 (1853-1856) [P. Roetter]