E-Flora BC: Electronic Atlas of the Flora of British Columbia

Sorbus scopulina var. cascadensis Greene
western mountain-ash (Cascade mountain ash)
Rosaceae (Rose family)

Introduction to Vascular Plants

© Virginia Skilton  Email the photographer   (Photo ID #23651)

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Distribution of Sorbus scopulina var. cascadensis
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Species Information

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Medium to tall shrub, 1-5 m tall; stems several, erect to spreading, freely branched, reddish-brown to yellowish; winter buds and young growth sticky, somewhat white- or grey-hairy.
Alternate, deciduous, pinnately compound; leaflets (7) 9 to 13, oblong-lanceolate to narrowly elliptic, 2-8 cm long, usually short-tapering to a sharp-pointed tip, smooth, finely saw-toothed almost to the base.
Inflorescence a flat-topped to somewhat rounded, branched cluster of numerous (70 to 200 or more) small flowers, the branches more or less white-hairy; corollas white to cream, the petals 5, oval, 4-6 mm long; calyces white-hairy, 5-lobed, the lobes triangular; ovaries inferior; stamens 15-20.
Berry-like pomes (like miniature apples), nearly globe-shaped, 7-10 mm long, orange to scarlet, not glaucous, 2- to 5-chambered; seeds 1 or 2 per chamber.
Two varieties occur in BC:

1. Leaflets often 13; stipules usually shed before end of blooming; plants from E of Coast-Cascade Mountains................ var. scopulina

1. Leaflets rarely more than 11; stipules persistent until after blooming; plants from W slope of Cascade Mountains..................... var. cascadensis (G.N Jones) C.L. Hitchc.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Mesic to moist glades, streambanks, forest edges and open forests in the montane and subalpine zones; frequent throughout BC, except rare W of Coast-Cascade Mountains; N to AK, E to AB and S to ND, WY, NM and N CA.

Source: The Illustrated Flora of British Columbia


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References