Echinopsis oxygona (Link) Zucc. ex Pfeiff. & Otto
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Echinopsis oxygona (Link) Zucc. ex Pfeiff. & Otto [ Echinocactus oxygonus Link] [Cactaceae]
L.K.G. Pfeiffer, F. Otto, Abbild. Beschr. Cact., vol. 2 : t. 4 (1846)