Although some consider this to be part of the genus Mammillaria, we keep it separate, in large part because of the large, red tubular flowers with irregular lips. Grigsby mistakenly sold this as Cochemiea halei, but it flowered and revealed its true identity. This species is endemic to Isla Margarita and Isla Magdalena off the west coast of Baja California Sur, where it occurs abundantly in rocky terrain. Known for forming large clumps with relatively long creeping stems, this species is attractive for its large violet flowers and clustering stems. These plants are seedlings in 5-inch pots.