Mammillaria trichacantha
The correct application of this name is uncertain, but it is generally associated with Mammillaria nana ssp. nana
Mammillaria - John Pilbeam pag.339
Mammillaria trichacantha SB 21
SB 21 - N of San Luis Potosi - San Luis Potosi - Mexico
Mammillaria trichacantha SB 21
SB 21 - N of San Luis Potosi - San Luis Potosi - Mexico