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6 924240 Sclerocactus polyancistrus (Engelm. & J.M. Bigelow) Britton & Rose [80 369468 Echinocactus polyancistrus Engelm. & J.M.Bigelow]
J. Torrey, Pacif. Railr. Rep., vol. 4 fasicle 3, : t. 2 (1853-1856) [P. Roetter]
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