Neomammillaria geminispina (Haw.) Britton & Rose, Cactaceae 4: 98–99. 1923 Neomammillaria geminispina (Haw.) Britton & Rose, Cactaceae 4: 98–99. 1923is new combination for Mammillaria geminispina Haw. in Philos. Mag. J. 63: 42. 1824Taxon for this nameNeomammillaria geminispina (Haw.) Britton & Rose