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6 1139504 Cylindropuntia echinocarpa (Engelm. & J.M.Bigelow) F.M.Knuth [125 720159 Opuntia echinocarpa Engelm. & J.M.Bigelow]
J. Torrey, Pacif. Railr. Rep., vol. 4 fasicle 3, : t. 18 (1853-1856) [P. Roetter]
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