Page authors: Don Knoke, David Giblin
Sorbus scopulina
Greene'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.

Flowers: May-August

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


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


Leaves pinnate; leaflets 9-13, narrowly oblong to oblong-lanceolate, 3-7 cm. long, tapered to the base and pointed at the tip, finely and sharply serrate almost the full length, glabrous, dark green and shiny above and much paler below.


Inflorescence a large, pubescent, flat-topped panicle, with at least 70 flowers; calyx obconic, whitish-pubescent, the 5 lobes triangular; petals 5, white, oval, 5-6 mm. long; stamens 15-20; carpels 3-4, the styles 2 mm. long.


Fruit sub-globose, fleshy, orange to scarlet, glossy, about 1 cm. broad.

Accepted Name:
Sorbus scopulina Greene
Publication: Pittonia 4(22): 130. 1900.

Synonyms & Misapplications:
Pyrus scopulina Longyear
Sorbus cascadensis G.N. Jones
Sorbus scopulina Greene var. cascadensis (G.N. Jones) C.L. Hitchc. [HC]
Sorbus scopulina Greene var. scopulina [HC]
Additional Resources:

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

WA Flora Checklist: Sorbus scopulina checklist entry.

E-Flora BC: Sorbus scopulina atlas page.

CalPhotos: Sorbus scopulina photos.

USDA Plants: Sorbus scopulina information.

65 photographs:
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