DistributionRead full entry
Range DescriptionThis species occurs in Mexico: Chihuahua, Sonora, Durango, and México. The three varieties are currently known from a total of eight to ten localities. The actual area of occupancy is estimated to be around 10 km2 (Mastretta-Yanes 2012). Herbarium based estimates using an expanded grid size give an estimate of up to 176 km2 (Farjon 2011).