Mammillaria mammillaris

It is a very geometric cactacea of a spherical shape, which is concave at the apex. It is generally solitary, but it can also form suckers. It consists of protruding conical, light green tubercles. Its cream-white spines are short and straight. Between the grooves, created by its tubercles, it creates a short white down. Its flowers are small and inconspicuous, forming a corolla around the apex.