Known from western Santa Cruz county, AZ south into Sonora, Mexico. At least 25 sites are present in the U.S., although population size at many sites is small and there is concern that recruitment is insufficient to maintain viable populations. However, the Mexican range is considerably larger than the U.S. range, and population sizes are believed to be generally larger there. Few occurrences are protected. Threats include livestock grazing (especially in the U.S. where it is known to be poorly managed), altered fire ecology due to non-native plant invasion, off-road vehicle use, and horticultural collection. The species is prized by collectors, and significant declines in roadside populations have been noted.
plants growing on roadsides are being collected
total AZ population number is unknown; total number of plants in AZ is ca. 100-200 plants ca. 20-30 plants are known in Sonora
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