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Range DescriptionThere are currently two disjunct subpopulations of this species. The small subpopulation in QuerÃ©taro occurs on medium to steep slopes of volcanic rock near Mesa de LÃ©on in a very small area (extent of occurrence is 25 kmÂ² and the area of occupancy is less than 10 kmÂ²). A new subpopulation has recently been discovered in Zacatecas (not shown on the species' range map to protect it), which is much larger. It grows at altitudes between 1,400 and 1,900 m asl.