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6 1009779 Thelocactus bicolor (Galeotti) Britton & Rose [80 368830 Echinocactus bicolor Galeotti ex Pfeiff.]
L.K.G. Pfeiffer, F. Otto, Abbild. Beschr. Cact. (Coloured version), vol. 2 : p. 25, t. 25 (1839)
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