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Sorbus scopulina Greene
Greene's Mountain Ash, Cascade Mountain-ash, Western Mountain-ash
Rosaceae (Rose Family)
USDA Symbol: SOSC2
USDA Native Status: L48 (N), AK (N), CAN (N)
Cascade mountain-ash is a shrub or shrub-like tree with several erect stems usually 3-12 ft. Bark is reddish. Deciduous leaves are pinnately compound with 11-15 shiny, oblong leaflets. Small, white flowers occur in large terminal clusters and are followed by persistent, red-orange berries. A shrub forming dense clumps, or rarely a small tree, with many small white flowers and small, applelike fruit.
This shrubby species takes the form of a small tree in southeastern Alaska. The common name honors Edward Lee Greene (1843-1915), the United States botanist who prepared the description. Birds and mammals eat the fruit.
From the Image Gallery
Plant CharacteristicsDuration: Perennial
Leaf Retention: Deciduous
Size Notes: Up to about 25 feet tall, often shorter.
Autumn Foliage: yes
Bloom InformationBloom Color: White
Bloom Time: Mar , Apr , May , Jun
DistributionUSA: AK , CA , CO , ID , MT , ND , NM , NV , OR , SD , UT , WA , WY
Canada: AB , BC
Native Distribution: W. Alt. to AK, s. to NM, UT & Tulare Co., CA; also Black Hills
Native Habitat: Canyons; wooded slopes; stream banks; 4000-9000 ft.
Growing ConditionsWater Use: Medium
Light Requirement: Sun , Part Shade , Shade
Soil Moisture: Moist
CaCO3 Tolerance: Low
Soil Description: Rich soils.
BenefitUse Wildlife: Grouse, cedar waxwings, and grosbeaks consume the berries.
Conspicuous Flowers: yes
Fragrant Flowers: yes
Find Seed or Plants
Find seed sources for this species at the Native Seed Network.
View propagation protocol from Native Plants Network.
National Wetland Indicator Status
From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
Native Seed Network - Corvallis, OR
BibliographyBibref 841 - Native Alternatives to Invasive Plants (2006) Burrell, C. C.
Search More Titles in Bibliography
Web ReferenceWebref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Additional resourcesUSDA: Find Sorbus scopulina in USDA Plants
FNA: Find Sorbus scopulina in the Flora of North America (if available)
Google: Search Google for Sorbus scopulina
MetadataRecord Modified: 2022-10-11
Research By: TWC Staff