Mammillaria petrophila K. Brandegee [ Neomammillaria arida (Rose ex Quehl) Britton & Rose]
      
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12 639481 Mammillaria petrophila K. Brandegee [80 638616 Mammillaria arida Rose ex Quehl] Cactaceae
N.L. Britton, J.N. Rose, Cact., vol. 4 : t. 7 (1923) [M.E. Eaton]