Cascade Mountain-Ash
Sorbus scopulina Greene

Collected either along the North Fork of the Salmon River from near the mouth of Hull Creek to near the junction of Hammerean Creek along the Lolo Trail in Lemhi Co., Idaho, on 2 Sep 1805, or near Hungery Creek along the Lolo Trail in Idaho Co., Idaho, on 27 Jun 1806. It is possible the three fragments on the left were found 2 Sep while the two fragments on the right were perhaps gathered on 27 Jun. The lateness of the inflorescences, however, makes it more likely all the fragments were gathered on 2 Sep. (Source)

A small tree or multi-trunked shrub forming dense clumps, with pinnate leaves and unbels of white flowers in spring, followed by red berries in autumn.  It can be anywhere from 1-4 meters tall. It bears whitish or yellowish bark. The flowers have 5 white, rounded petals, fragrant; many in upright, rounded clusters 3-7.5 cm wide, in early summer. Leaves are pinnately compound, characteristic of most ashes. The leaves are10-20 cm long; pinnately compound with 11-15 stalk-less leaflets, each 3-6 cm long, lanceolate, pointed at tip, rounded at base; sharply saw-toothed almost to base; becoming hairless. Shiny dark green above, slightly paler below. The berry is scarlet to orange, drying to a dark purple. Needs moderately moist soils; not particularly drought tolerant. Found at 6,500' to 9,000' from the east slope of the Rocky Mountains west across the mountainous regions of the Great Basin.

Food Uses
The berries are quite bitter, but the ripe fruit mellowed by repeated freezing can be tasty.  The fruit is usually cooked and sweetened to make jams, jellies, pies, ale, and a bittersweet wine. The berries have been dried and ground into flour.

Medicinal Uses
Native peoples boiled the peeled branches or inner bark to make tea for treating back pain, colds, headaches, sore chests, and internal bleeding. The branches were boiled and the steam inhaled to relieve headaches and sore chests.  The stringent berry tea has been used as a gargle for relieving sore throats and tonsillitis.