no HD illustration available (m2)
6 695881 Neomammillaria subpolyedra (Salm-Dyck) Britton & Rose [125 639770 Mammillaria subpolyedra Salm-Dyck]
C.F. Förster, T. Rümpler, Handb. Cacteenk., ed. 2, vol. 1 : p. 357, t. 37 (1886)