Mammillaria heyderi Muehlenpf. [ Mammillaria heyderi var. applanata (Engelm.) Engelm.]
no HD illustration available (m1)
Mammillaria heyderi Muehlenpf. [Cactaceae]
Rep. U.S. Mex. Bound. (Cactaceae of the boundary): t. 9 () [P. Roetter]