Fraxinus quadrangulata Oleaceae
Blue Ash FRAK-si-nus kwa-drang-u-LA-ta
- Broadleaf deciduous tree, 50-70 ft (15-21 m) high, slow growing, narrow, rounded crown, often irregular; stems 4-sided, with 4 conspicuous ridges or wings. Leaves opposite, pinnate compound, 17-35 cm long, 5-11 leaflets, each leaflet 5-12 cm long and 2.5-5 cm wide, ovate to lanceolate, short stalked, tip acuminate, base wedge-shaped or rounded, sharply serrate, glossy dark green above, lighter below and pubescent along lower veins and midrib near base. Flowers perfect (bisexual), purplish. Fruit (samara) wings oblong, 2.5-5 cm long, 0.8-1.2 cm wide.
- Sun. Will grow in doughty soils and alkaline conditions.
- Hardy to USDA Zone 4 Native from southern Ontario to Michigan to Arkansas and Tennessee. The inner bark turns blue when exposed; a blue dye is obtained by macerating the inner bark in water.
- quadrangulata: with four angles., a reference to the four-angled appearance of the stems.
- Oregon State Univ. campus: north of Kelley Engineering Center in a parking lot island.