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libutron:

Mammillaria formosa
As most Mammillaria species, this one, Mammillaria formosa (Cactaceae), sometimes commonly called Owl Eyes or Royal Cross, is native to Mexico, where can be found in the states of Coahuila, Aguascalientes, Guanajuato, Zacatecas, Tamaulipas, Nuevo Leon and San Luis Potosí.
Reference: [1]
Photo credit: ©alloe | Locality: cultivated 

libutron:

Mammillaria formosa

As most Mammillaria species, this one, Mammillaria formosa (Cactaceae), sometimes commonly called Owl Eyes or Royal Cross, is native to Mexico, where can be found in the states of Coahuila, Aguascalientes, Guanajuato, Zacatecas, Tamaulipas, Nuevo Leon and San Luis Potosí.

Reference: [1]

Photo credit: ©alloe | Locality: cultivated