Native to (or naturalized in) Oregon:
- Broadleaf deciduous tree, more often a large shrub, to about 30 ft (10 m) tall, densely branched, rounded form. Bark smooth and dark gray. Leaves simple, opposite, ovate-oblong, atypical for a maple since they resemble the leaves of a Carpinus, Hornbeam, 8-12 cm long and 4-5 cm wide, unlobed, margin double serrate; fall color bright yellow or brown. Flowers greenish, about 1 cm across, in slender clusters, dioecious - male and female flowers on separate plants. Fruit with spreading wings, at a right or obtuse angle, about 3 cm across.
- Part shade, moist soil.
- Hardy to USDA Zone 5 Native to Japan, were it is widely distributed.
- carpinifolium: from Latin carpinus, Hornbeam, and folium, leaf; i.e., a leaf resembling that of a Carpinus.
- Portland, Oregon: Hoyt Arboretum