ruthbancroftgarden:

Mammillaria geminispina

This species of Mammillaria, sometimes called the “twin-spined Mammillaria”, is renowned for its ultra-white spines and its tendency to form large clumps. It produces most of its little magenta flowers in the fall, but these are sparser than those of many other Mammillaria species. From the state of Hidalgo in east-central Mexico.

-Brian