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5 432137 Ferocactus robustus (Karw. ex Pfeiff.) Britton & Rose [181 369532 Echinocactus robustus Otto ex Pfeiff.]
Nova Acta Phys.-Med. Acad. Caes. Leop.-Carol. Nat. Cur., vol. 19(1): (Elfter Band): t. 16, fig. 2 (1839) [L. Pfeiffer]
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