Mammillaria huitzilopochtli is a solitary or slowly clumping cactus forming untidy clumps, up to 8 cm tall and 6 cm wide. This Mammillaria has a very narrow range in the state of Oaxaca, Mexico.
Mammillaria huitzilopochtli, commonly known as biznaga of Huitzilopochtli, is a perennial member of the Cactaceae family native to Mexico. It has single or branched dark-green stems spherical at first then cylindrical to club-shaped. The small tubercles are cylindrical to conical with elliptic areloes, short pectinated radial spines and sometimes long black central spines. A ring of pink flowers is produced then a red club-shaped fruit with brown seeds.