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6 432069 Ferocactus glaucescens (DC.) Britton & Rose (DC.) Britton & Rose [Echinocactus pfeifferi Zucc. ex Pfeiff.]
L.K.G. Pfeiffer, F. Otto, Abbild. Beschr. Cact., vol. 2 : p. 2, t. 2 (1839)
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