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Mammillaria williamsii
Contr. U.S. Natl. Herb. 2: 129. 1891 as Mamillaria Notes: (=Anhalonium Williamsii, Engelm.).
Contr. U.S. Natl. Herb. 2: 129. 1891 as Mamillaria Notes: (=Anhalonium Williamsii, Engelm.).
(15 Photos)