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