Page authors: Don Knoke, David Giblin
Sorbus sitchensis
Sitka mountain-ash
WTU specimens
Other herbaria
WTU images

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.

Flowers: June-August

Origin: Native

Conservation Status: Not of concern

Description:
General:

Erect, deciduous, several-stemmed shrub 1-4 m. tall, the young growth reddish soft-hairy, the older bark grayish-red.

Leaves:

Leaves pinnate; leaflets 7-11, dark green above and paler beneath, oblong-obovate, 2-5 cm. long, rounded at the tip, sharply serrate not more than half their length.

Flowers:

Inflorescence a round-topped panicle, 15-80 flowered; calyx glabrous, obconic, the 5 lobes triangular; petals 5, white, rhombic to oval, 4-5 mm. long; stamens 15-20; carpels 4-5, the styles 2-3 mm. long.

Fruits:

Fruit ellipsoid, fleshy, red but glaucous with a bluish cast, about 1 cm. long.

Accepted Name:
Sorbus sitchensis M. Roem.
Publication: Syn. Rosifl. 139. 1847.

Synonyms & Misapplications:
Pyrus sitchensis (M. Roem.) Piper
Infraspecies:
var. grayi – Sitka mountain-ash    Occurring on both sides of the Cascades crest in Washington; Alaska to northern California.
var. sitchensis – Sitka mountain-ash    Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Alberta, Idaho, and Montana.
Additional Resources:

PNW Herbaria: Specimen records of Sorbus sitchensis in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Sorbus sitchensis checklist entry.

E-Flora BC: Sorbus sitchensis atlas page.

CalPhotos: Sorbus sitchensis photos.

USDA Plants: Sorbus sitchensis information.

40 photographs:
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