Echinopsis oxygona (Link) Zucc. ex Pfeiff. & Otto
      
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1 371877 Echinopsis oxygona (Link) Zucc. ex Pfeiff. & Otto [181 369410 Echinocactus oxygonus Link] Cactaceae
L.K.G. Pfeiffer, F. Otto, Abbild. Beschr. Cact. (Coloured version), vol. 2 : p. 4, t. 4 (1839)