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6 1009811 Thelocactus hexaedrophorus (Lemaire) Britton & Rose [125 369145 Echinocactus hexaedrophorus Lemaire]
L.K.G. Pfeiffer, F. Otto, Abbild. Beschr. Cact. (Coloured version), vol. 2 : p. 13, t. 13 (1839)
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