Neomammillaria mystax (Mart.) Britton & Rose
      
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2 695793 Neomammillaria mystax (Mart.) Britton & Rose [80 639380 Mammillaria mystax Mart.] Cactaceae
N.L. Britton, J.N. Rose, Cact., vol. 4 : t. 9 (1923) [D.G. Passmore]