Mammillaria grahamii var. grahamii  

Family: Cactaceae

pincushion cactus, more...Graham's nipple cactus (es: cabeza de viejo, choyita)

[Mammillaria microcarpa Engelm., moreMammillaria microcarpa var. auricarpa W.T. Marsh., Mammillaria milleri (Britt. & Rose) Bödecker]