Native to (or naturalized in) Oregon:
- Broadleaf deciduous tree, 20-30 ft (6-9 m), upright, oval, very attractive copper-red bark, exfoliates, paper-like. Leaves opposite, compound (trifoliate i.e., 3 leaflets), 7-13 cm long, middle leaflet short stalked and coarsely toothed, lateral leaflets nearly without a stalk and not as toothed, blue-green above, pale green to whitish below; petiole pubescent. Fall color may range from green, red-brown, to a striking red. Flowers greenish-yellow, small, in 2.5 cm long clusters, appear as leaves expand. Fruit (samara) 2.5-3 cm long, wings diverge at a 60-90° angle, persisting into winter, nutlet often empty.
- Sun to part shade. Adaptable to varied soils, prefers well-drained and moist soils, but performs well in clay soils; pH adaptable. Can even be used in bonsai.
- Hardy to USDA Zone 4 Native to Central China.
- griseum: gray, referring to the underside of leaves.
- Oregon State Univ. campus: north of Cordley, next to Acer circinatum.