Virginia Tech Dendrology

Sitka mountain-ash Rosaceae Sorbus sitchensis M. Roem. Listen to the Latin symbol: SOSI2
Leaf: Alternate, pinnately compound (7 to 11 leaflets), alternate, and deciduous. Leaflets are elliptical, 1 to 3 inches long and serrated except near their base; green and smooth above and paler green below.
Flower: Perfect, small white flowers borne in large, dense, flat-topped clusters.
Fruit: Small round pomes (1/4 to 1/2 inch diameter); red to orange.
Twig: Stout and with many spur shoots; olive drab when young but turning greenish brown with age; light colored lenticels
Bark: Thin and grayish- to brownish-green regardless of age.
Form: An erect shrub or small tree, to 25 feet.
 Looks like: Greene's mountain-ash - European mountain-ash - Oregon ash
leaf flower fruit twig bark form1 map
Additional Range Information: Sorbus sitchensis is native to North America. Range may be expanded by planting. See the full-size PDF map.
More Information: Fall Color
External Links: USDAFS FEIS Silvics - USDA Plants Database
All material © 2018 Virginia Tech Dept. of Forest Resources and Environmental Conservation; Photos and text by: John Seiler, Edward Jensen, Alex Niemiera, and John Peterson; Silvics reprinted from Ag Handbook 654; range map source information