Sorbus scopulina
Common name: 
Greene Mountain Ash
Western Mountain Ash
SOR-bus scop-u-LIN-a
Native to (or naturalized in) Oregon: 
  • Deciduous shrub, to 15 ft (4.5 m) tall, rarely a small tree (most commonly in southeastern Alaska), forms dense thickets; bark, gray or reddish, smooth.  Leaves alternate, pinnately compound, 10-23 cm long, 9-15 leaflets, lanceolate, each 3-6 cm long, rounded base, apex acute, margin serrate for almost the entire length, shiny dark green above, slightly paler below.  Flowers 10 mm wide, 5 rounded white petals, 15 to 20 stamens, 3 to 4 styles, many flowers (70-200) in flat topped clusters (corymbs), fragrant.  Fruit about 10 mm in diam., glossy orange-red, bitter; persist into winter, providing food for birds and mammals.
  • Sun or light shade.  Insect and/or disease prone, especially when stressed.
  • Hardy to USDA Zone 2      Native range from southern Alaska to northern California, mainly in the east Cascades, east to the Dakotas, and south to Utah and New Mexico.
  • scopulina: of the rocks or cliffs.   Common name: Greene Mountain Ash, honors Edward L. Greene (1843-1915), the U.S. botanist who prepared the description of the plant.
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  • flower cluster and leaves, May

    flower cluster and leaves, May