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Brunstein [23] noted limber pine was absent from Rocky Mountain bristlecone pine communities on the east slope of the Park Range of Colorado. Preliminary classification for the coniferous forest and woodland series of Arizona and New Mexico.

The Colorado-Green River drainage has separated the 2 bristlecone pine species for millennia, and there is a 160-mile (260-km) gap between the 2 bristlecone species at their closest point in Utah and Colorado [57,101]. Rocky Mountain bristlecone pine occurs in upper montane and subalpine communities [149]. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station.

Engelmann spruce (Picea engelmannii) and limber pine (Pinus flexilis) associate with Rocky Mountain bristlecone pine throughout most of Rocky Mountain bristlecone pine's range.

Its northernmost occurrence is in Gilpin County, Colorado, on the Front Range just south of Rocky Mountain National Park.

Distribution continues south through the San Juan and Sangre de Cristo mountains to Mineral County, Colorado, and northern Santa Fe and San Miguel counties, New Mexico [11,90]. Watershed management in the central and southern Rocky Mountains: a summary of the status of our knowledge by vegetation types.

The World Conservation Union's Species Survival Commission (IUCB-SSC) lists Rocky Mountain bristlecone pine as a lower risk, near-threatened species: close to qualifying for "Vulnerable" status, with this classification needing updating [66]. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station.

Disjunct distributions, and possibly other factors, prevent natural hybridization among the 3 species.

Available: fed.us/database/feis/plants/tree/pinari/[ ]. The scientific name of Rocky Mountain bristlecone pine is Pinus aristata Engelm. Rocky Mountain bristlecone pine, Great Basin bristlecone pine (P. Bristlecone and foxtail pines readily produce fertile hybrids in the laboratory [131,152].

Rocky Mountain bristlecone pine tends to exclude Engelmann spruce and limber pine on upper subalpine and timberline sites. Even in lower subalpine sites, Rocky Mountain bristlecone pine is more common in mesic areas than limber pine [107]. An outlier population occurs in Coconino County, northern Arizona, on the San Francisco Peaks [69,90]. The ranges of Great Basin and Rocky Mountain bristlecone pines do not overlap. Geological Survey provides distributional maps of Rocky Mountain bristlecone and Great Basin bristlecone pines.

Rocky Mountain bristlecone pine occurs in the southern Rocky Mountains of Colorado, New Mexico, and Arizona.

Rocky Mountain bristlecone pine is protected from salvage in Arizona [4].

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