The Sitka mountain-ash (Sorbus sitchensis) belongs to Rosaceae (the Rose family). It is a small deciduous tree that is distributed to southwestern Alaska southeast along the coast to the Cascade Range and to central California. This tree grows in sunny mountains, and it can reach 6-7.5 m in height. The leaves are odd-pinnate compound with 7-11 leaflets. The leaflet is elliptic, saw-toothed above middle, green above and pale green beneath. The white flowers bloom in the terminal compound corymbs from May to July. The fruits are round pome and they ripen red, turning orange or puple from September to October. This species is named for the Sitka Island, Alaska, where it was discovered.