Fraxinus latifolia (Oregon ash) is a member of the ash genus Fraxinus, native to western North America on the west side of the Cascade Range from southwestern British Columbia south through western Washington and western Oregon to central California. George Bentham CMG FRS ( September 22, 1800 &ndash September 10, 1884) was an English Botanist, characterized by Duane Isely An ash can be any of four different tree genera from four very distinct families; most commonly in a combined form (e British Columbia (ˌbrɪtɨʃ kəˈlʌmbiə ( BC) ( (la Colombie-Britannique C Washington ( is a state in the Pacific Northwest region of the United States. Oregon ( is a state in the Pacific Northwest region of the United States. California ( is a US state on the West Coast of the United States, along the Pacific Ocean. 
It can grow to 25 meters in height, with a trunk diameter of 30-80cm. The leaves are pinnate, 12-33 cm long, with 5-9 leaflets, each leaflet ovate, 6-12 cm long and 3-4 cm broad, and often show signs of disease and brown rot, even on otherwise healthy plants. In Botany, a leaf is an above-ground Plant organ specialized for Photosynthesis. The fruit is a samara, 3-5 cm long including the wing. The term fruit has different meanings dependent on context and the term is not synonymous in Food preparation and Biology. A samara is a type of Fruit in which a flattened wing of fibrous papery tissue develops from the ovary wall 
The Oregon ash prefers damp, loose soils, and grows from sea level to 900 meters in elevation, up to 1700 m in the south of the range in California. In central southern California, it intergrades with Fraxinus velutina (velvet ash) of southern California east into Arizona. Fraxinus velutina ( Velvet Ash or Arizona Ash) is a species of Fraxinus native to southwestern North America, in the The State of Arizona ( is a state located in the southwestern region of the United States.