Sorbus
mountain-ash, service tree, whitebeam
4 species
2 subspecies and varieties
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Sorbus aucupariaEuropean mountain-ash
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to Oregon, east to the Atlantic Coast.
Habitat: Forest edge, thickets, shorelines, and other generally moist areas where often disturbed.
Origin: Introduced from Europe
Flowers: May-June
Growth Duration: perennial
Sorbus hybridaSwedish mountain-ash, Swedish service-tree
Distribution: Occurring west of the Cascades crest in lowland western Washington.
Habitat: Shoreline ledges and thickets at low elevations.
Origin: Introduced
Flowers: May-June
Growth Duration: perennial
Sorbus scopulinaGreene's mountain ash, Cascade mountain-ash, western mountain-ash
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Open areas, from middle elevations to the subalpine.
Origin: Native
Flowers: May-August
Growth Duration: perennial
Sorbus sitchensisSitka mountain-ash
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to northern California, east to Alberta, Idaho, and Montana.
Habitat: Forest openings at mid- to high elevations in the mountains.
Origin: Native
Flowers: June-August
Growth Duration: perennial
var. grayi – Sitka mountain-ash
var. sitchensis – Sitka mountain-ash