Sorbus scopulina

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Sorbusscopulina

Sorbus scopulina, commonly known as the Cascade mountain-ash, is a species of deciduous tree or shrub in the Rosaceae family. It is native to western North America, from Alaska through British Columbia and south to California, and east to Montana. This species is part of the Sorbus genus, which includes many other species of trees and shrubs known for their attractive fruit and flowers.

Description

Sorbus scopulina typically grows to a height of 1 to 5 meters, occasionally reaching up to 12 meters in tree form. It has a rounded to irregular crown, with bark that is smooth and gray on younger trees, becoming scaly and darker with age. The leaves are pinnately compound, 5 to 15 cm long, with 9 to 11 leaflets that are lanceolate to oblong, sharply serrated, and dark green above with a paler underside.

In late spring to early summer, Sorbus scopulina produces dense corymbs of 20 to 50 small, white flowers. These are followed by clusters of small, round, red to orange berries (technically pomes) in late summer to fall, which are a significant food source for various species of birds and mammals.

Habitat and Distribution

Sorbus scopulina is found in a variety of habitats, from moist mountain forests to dry, rocky slopes and subalpine areas. It prefers well-drained soils and can be found at elevations from sea level to over 3,000 meters. Its adaptability to different environments and attractive appearance make it a popular choice for native plant gardens and restoration projects in its native range.

Ecological Role

The berries of Sorbus scopulina play an important role in the diet of many wildlife species. Birds, including thrushes, robins, and waxwings, are particularly fond of the fruit and help disperse the seeds. The tree also provides habitat and nesting sites for various bird species. In addition to its ecological benefits, Sorbus scopulina is valued for its ornamental qualities, with its showy flowers, fruit, and fall foliage color adding aesthetic value to landscapes.

Conservation

While Sorbus scopulina is not currently listed as threatened or endangered, its populations are susceptible to habitat loss, invasive species, and changes in climate. Conservation efforts focus on habitat protection, sustainable management practices, and the use of Sorbus scopulina in native plant restoration projects to ensure its continued presence in its native ecosystem.

Cultivation

Sorbus scopulina is cultivated for its ornamental value in gardens and landscapes. It prefers full sun to partial shade and can adapt to a range of soil types, provided they are well-drained. The tree is relatively low-maintenance, requiring minimal pruning and care once established. It is also used in reforestation and habitat restoration projects due to its ecological value and adaptability.