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6 695881 Neomammillaria subpolyedra (Salm-Dyck) Britton & Rose (Salm-Dyck) Britton & Rose [Mammillaria subpolyedra Salm-Dyck]
C.F. Förster, T. Rümpler, Handb. Cacteenk., ed. 2, vol. 1 : p. 357, t. 37 (1886)
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