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6 639736 Mammillaria sphaerica A. Dietr. A. Dietr. [Dolichothele sphaerica (D.Dietr. ex Engelm.) Britton & Rose]
N.L. Britton, J.N. Rose, Cact., vol. 4 : t. 7 (1923) [M.E. Eaton]
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