Broadleaf deciduous tree, 25-35ft (~7.5-10.5 m), rounded outline, spreading and ascending branches, open, reddish copper-colored foliage in spring. Leaves alternate, compound (pinnate and bipinnate), 15-20 cm long, each leaflet (2.5-10 cm long) irregularly crenate-serrate. Flower is perfect, yellow, 4 petals, about 1 cm wide, in clusters 30-40 cm long. Blooms in summer, early to late, apparently the time is dependent upon climate and seedling variation. Fruit are papery capsules (green, yellow, finally light brown), 3.5-5 cm long, in clusters, persist.
Sun, tough and adaptable.
Hardy to USDA Zone 5 Native to China, Japan, Korea. There is an upright form available, i.e., ‘Fasigiata’.
Caution: Koelreuteria paniculata is considered to be invasive and a threat to native vegetation in some parts of the country.
Koelreuteria: after Joseph Gottlieb Koelreuter (1733-1806), German professor of botany. Paniculata: with flowers in panicles.

Information obtained from: OSU http://oregonstate.edu/dept/ldplants/