Mountain Ash aka Rowanberry (Sorbus sitchensis)
Technically a tree, this seems more like a shrub at higher elevations. Its red berries (or sometimes yellow, as shown below) are a favorite of the varied thrush.
Stehekin River, North Cascades N.P., WA, 8/2012.
The Rowan (from the Nordic rune meaning ‘magic’) tree and its berries were thought by the Celts to be magical and used to ward off evil spirits.