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xx 638983 Mammillaria flavescens (DC.) Pfeiff. (DC.) Pfeiff. [Mammillaria nivosa Link ex Pfeiff.]
K.M. Schumann, M G├╝rke, F. Vaupel, Bl. Kakt., vol. 3 : t. 165 (1900-1905) [J. Pohl]
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