Gymnocalycium reductum (Link) Pfeiff. & Otto
      
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1 485913 Gymnocalycium reductum (Link) Pfeiff. & Otto [125 171658 Cactus gibbosus Haw.] Cactaceae
L.K.G. Pfeiffer, F. Otto, Abbild. Beschr. Cact. (Coloured version), vol. 2 : p. 12, t. 12 (1839)