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6 1139460 Cylindropuntia alcahes (F.A.C.Weber) F.M.Knuth (F.A.C.Weber) F.M.Knuth [Opuntia alcahes F.A.C.Weber]
N.L. Britton, J.N. Rose, Cact., vol. 1 : t. 11 (1919) [M.E. Eaton]
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