Greene's mountain-ash Rosaceae Sorbus
Leaf: Alternate, pinnately compound (11 to 15 leaflets), and deciduous. Leaflets are lanceolate, 1 to 2 1/2 inches long and sharply serrated nearly to base, shiny green and smooth above and paler green below.
Flower: Perfect, small white flowers are borne in large, dense, flat-topped clusters; appearing in early summer.
Fruit: Small, round, reddish-orange pomes (1/4 to 3/8 inch diameter), occur in clusters and ripen in late summer to early fall.
Twig: Moderate, olive-green when young but turning reddish brown with age, light colored lenticels; buds large and sticky.
Bark: Thin shiny grayish green to brownish green with numerous lenticels.
Form: An erect deciduous shrub growing to 15 feet tall, often forming dense thickets.
Looks like: Sitka mountain-ash - European mountain-ash - Oregon ash