Native to (or naturalized in) Oregon:
- Broadleaf deciduous tree, 40-80 ft (12-24 m) tall, narrow, dense crown, straight trunk. Leaves opposite, pinnately compound, 15-30 cm long, 5-7 oval leaflets, each 5-15 cm long, 2.5-4 cm wide, elliptical, short-pointed at ends, lateral leaflets are sessile or with a short stalk (petiolule), medium to light green above and paler and slightly pubescent below; fall color is yellow or brown. Flowers dioecious - male and female flowers on separate trees, small, about 3 mm, male flowers yellowish and female flowers greenish, both in small clusters and without petals, appear before leaves. Fruit, single samara, 3-5 cm long, hang in dense clusters.
- Sun or part shade. Survives standing water in winter months and, when established, need not be watered during the summer. Valued as an ornamental tree in Europe more than here.
- Hardy to USDA Zone 6 Native to western portions of Washington and Oregon and south in the Coast Range and Sierra Nevada to Central California. The only ash native to the Pacific Northwest.
- latifolia: with broad leaves
- Oregon State Univ. campus: large tree on the north side of USDA Forage Seed Lab. on Campus Way, near 35th St. Also behind Dixon Lodge, corner 11th St. and Jefferson Ave.