Description from Flora of China
Trees deciduous, ca. 12 m tall. Young branches pubescent. Leaf rachis pubescent, 14-24 cm; leaflets 3-7(-9), broadly elliptic, 8-14 X 5-10 cm, scabrous and densely broadly cuneate, oblique, margin entire, pubescent adaxially, densely puberulent abaxially, base apex acute to rounded; lateral veins 7 or 8 on each side of midrib; petiolules ca. 1 cm. Inflorescences cymose, terminal, 4-12 cm. Corolla ca. 2.5 cm, pale purple, dark purple striate. Capsule long terete, curved, 20-47 cm X ca. 8 mm, slightly 4-angular; pericarp black, thin leathery. Seeds ovoid, less than 3 cm, indistinctly membranous winged. Fr. Feb-Mar.
Slopes, forests; 500-1600 m. SW Yunnan [Cambodia, India (Manipur), Laos, Myanmar, Thailand, Vietnam].