Mammillaria schiedeana

Mammillaria schiedeana is a species of Mammillaria native to Mexico that was first described in 1838 by C. Ehrenb.

Description
Mammillaria schiedeana has a circle of yellow thorns around its growing point, with the rest being white. It has turbicles like all other Mammillaria species. This plant is also a rapid clumper.

Flowers
Its flowers are white and in a "crown" like other Mammillaria species.