California Buckeye, California Horsechestnut
- Broadleaf deciduous tree or large shrub, single or multistemmed, 12-30ft (3.5-9 m) tall, flat topped to rounded and very broad; trunk short, with many ascending branches, bark grayish white. Leaves opposite, palmately compound, 5 leaflets, occasionally 7, each 7.5-15 cm long, elliptic-oblong to lance-oblong, base narrowed or rounded, tip acuminate, margin sharply serrate, dark green above, paler below with hairs on veins; petiole 1-2.5 cm long. Flowers showy, white to rose-colored, fragrant, about 2.5 cm long, in dense, narrow clusters, 8-20 cm long; stamens long-exserted, petals of equal length. Fruit somewhat pear shaped, 5-7 cm long, usually contains 1 large seed, 2-5 cm, they are glossy brown and poisonous.
- Sun, drought resistant, often summer deciduous in its native habitat, will retain leaves until fall if given supplemental irrigation. All parts of the tree are toxic, honeybees are poisoned by the nectar and pollen.
- Hardy to USDA Zone 7 Native to California, found in the woodlands and valleys of the Coast Range, Sierra Nevada and Tehachapi Mountains.
- Portland, Oregon: Hoyt Arboretum.