Opuntia fragilis (Nutt.) Haw. [ Opuntia brachyarthra Engelm. & J.M. Bigelow]
      
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6 720251 Opuntia fragilis (Nutt.) Haw. [125 171647 Cactus fragilis Nutt.] Cactaceae
J. Torrey, Pacif. Railr. Rep., vol. 4 fasicle 3, : t. 12 (1853-1856) [P. Roetter]