Sorbus sitchensis

Sorbus sitchensis, commonly known as western mountain ash and Sitka mountain-ash, is a small species of shrub of northwestern North America.

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It forms a multi-stemmed plant, either a shrub or small tree, reaching heights of 1–4 metres (3+1⁄2–13 ft). The winter buds are not sticky, with rusty hairs. The leaves are alternate, compound, six to ten inches long. There are 7–11 blue-green leaflets, lanceolate or long oval, with a rounded tip and usually toothed from the middle to end. In autumn, they turn yellow, orange and red. The stipules are leaf-like and caducous. Cymes of 80 or fewer white flowers bloom from June through September (after the leaves are fully grown). The five-petaled flowers are less than a centimetre across. The cymes are flat, compound and three or four inches across. The fruit is a berry-like pome, globular, one-quarter of an inch across, bright pinkish red, and borne in cymous clusters. Fall foliage and fruit Similar species The otherwise similar Sorbus scopulina has yellow-green sharp-pointed leaflets that are sharply serrated over most of their length.

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