Oregon ash (Fraxinus latifolia) belongs to the family Oleaceae (the Olive family). It is a tall deciduous tree that is native to western North America. This tree grows on damp, loose soils, and it can reach 12-24 m in height. The bark is thin, smooth, and gray-green when young but eventually becoming up to thick and furrowed with thin, flat ridges, gray-brown. The leaves are pinnately compound with 5-9, broadly ovate or obovate leaflets. The small, greenish-white, inconspicuous flowers borne in dense clusters in spiring. The fruits are samaras, 3-5 cm long including the wing.