mountain-ash, service tree, whitebeam
5 species
2 subspecies and varieties
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Sorbus aucupariaEuropean mountain-ash
Distribution: Introduced, commonly planted species, spread by birds, near habitations.
Habitat: Often in areas where it appears to be native.
Origin: Introduced
Flowers: May - June
Sorbus hybridaSwedish service-tree
Origin: Introduced
Sorbus intermediaSwedish whitebeam
Origin: Introduced
Sorbus scopulinaGreene's mountain ash, Cascade mountain-ash, western mountain-ash
Distribution: Alaska south to California, east to the Dakotas and Colorado.
Habitat: Open areas, from the foothils to sub-alpine.
Origin: Native
Flowers: May - Early July
Sorbus sitchensis
Distribution: In the mountains on both sides of the Cascades and Olympic Mountains in Washington; Alaska south to northern California, east to Idaho and Montana.
Habitat: Forest openings at mid- to high elevations in the mountains.
Origin: Native
Flowers: June-July
var. grayi – Sitka mountain-ash
var. sitchensis – Sitka mountain-ash