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6 1139504 Cylindropuntia echinocarpa (Engelm. & J.M.Bigelow) F.M.Knuth [125 720159 Opuntia echinocarpa Engelm. & J.M.Bigelow]
N.L. Britton, J.N. Rose, Cact., vol. 1 : t. 7 (1919) [M.E. Eaton]
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