Mammillaria sphaerica A. Dietr. [ Dolichothele sphaerica (D.Dietr. ex Engelm.) Britton & Rose]
no HD illustration available (m1)
Mammillaria sphaerica A. Dietr. [] [Cactaceae]
N.L. Britton, J.N. Rose, Cact., vol. 4 : t. 7 (1923) [M.E. Eaton]