Native to (or naturalized in) Oregon:
- Broadleaf deciduous shrub, multi-stemmed, erect, oval, 15-20 ft (4.5-6 m) tall, slightly less spread, but can be grown as a tree. Leaves alternate, pinnately compound, 4-8 cm long, with 8-12 leaflets, each 1-2.5 cm long, obovate to elliptic-oblong, apex rounded and mucronate (abrupt tip), pubescent when young, bright green. Flowers pea-like, yellow, 1.5-2 cm long, on stalks (pedicels) 1.5-2.5 cm long. Fruit, pod, 3.5-5 cm long, with 6 reddish-brown, oblong to spherical seeds, 2.5-4 0 mm in diameter; pods open with a popping sound when ripe.
- Sun or light shade. Adaptable, very cold hardy, tolerant of poor soil, drought, alkalinity, salt, and strong winds. It is a nitrogen fixer. Not considered highly ornamental. But it is used as such in very cold regions, e.g., Fairbanks, Alaska. Used as hedge, screen, wind break, and cover for wild life. Can be grown as a "standard" (tree-like).
- Hardy to USDA Zone 2 Native to Siberia and Mongolia. Several cultivars are available. Listed as a noxious weed in some Midwestern states.
- arborescens: tending to be woody.