Rocky Mountain Douglas-fir

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The Rocky Mountain Douglas-fir, Pseudotsuga menziesii subsp. glauca, is an evergreen conifer native to the interior mountainous regions of western North America, from central British Columbia and southwest Alberta in Canada southward through the United States to the far north of Mexico.[1] The range is continuous in the northern Rocky Mountains south to eastern Washington, eastern Oregon, Idaho, western and south-central Montana and western Wyoming, but becomes discontinuous further south, confined to "sky islands" on the higher mountains in Utah, Colorado, Arizona and New Mexico, with only very isolated small populations in eastern Nevada, westernmost Texas, and the north of Coahuila, Chihuahua, and Sonora in Mexico. It occurs from 600 m altitude in the north of the range, up to 3,000 m, rarely 3,200 m, in the south. Further west towards the Pacific coast, it is replaced by the related Coast Douglas-fir (Pseudotsuga menziesii subsp. menziesii), and to the south, it is replaced by Mexican Douglas-fir (Pseudotsuga lindleyana) in high mountains as far south as Oaxaca.

The taxonomic status of the Rocky Mountain Douglas-fir, is disputed, variously treated as a variety (Pseudotsuga menziesii var. glauca),[2] subspecies (Pseudotsuga menziesii subsp. glauca),[3] and more rarely (mainly in the past) as a distinct species (Pseudotsuga glauca).[4] The strong ecological and genetic differentiation with no significant intergradation[5] supports subspecific treatment.[3]

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