State List: AK, CA, ID, MT, OR, WA
Canada: AB, BC, YT
Western Mountain Ash,
Sorbus sitchensis M. Roem.
Varieties:
Sorbus sitchensis var. grayi- Western Mountain Ash
Sorbus sitchensis var. sitchensis- Sitka Mountain Ash
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Native distribution map for Sorbus sitchensis
Map courtesty USDA NRCS PLANTS Database
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Sorbus>Western Mountain Ash, Sorbus sitchensis