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6 485709 Gymnocalycium denudatum (Link & Otto) Pfeiff. ex Mittler (Link & Otto) Pfeiff. ex Mittler [Gymnocalycium megalothelon (Sencke ex Schumann) Britton & Rose]
N.L. Britton, J.N. Rose, Cact., vol. 3 : t. 18 (1922) [M.E. Eaton]
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