Mammillaria schumannii Hildm. [ Bartschella schumannii (Hildm.) Britton & Rose]
no HD illustration available (m1)
Mammillaria schumannii Hildm. [Cactaceae]
N.L. Britton, J.N. Rose, Cact., vol. 4 : t. 7 (1923) [M.E. Eaton]