Description from Flora of China
Trees or shrubs, 3-5(-10) m tall; twigs glabrous. Leaves trifoliolate; lateral leaflets subsessile, petiolule of terminal leaflet 2-4 cm; leaflet blades oblong-lanceolate to elliptic, 5-10 cm, subcoriaceous, glabrous or densely pubescent on abaxial surface when young and pubescent along veins when mature, green adaxially, pale green abaxially, lateral veins 7-10 pairs, base obtuse to rounded, sometimes oblique on lateral leaflets, margin serrulate with hard teeth, apex narrowly acuminate. Corymb broad, at least 5 cm, flowering after emergence of foliage. Flowers white or rosy. Capsule inflated to pear-shaped, 4-5 × 2.5-3 cm, base narrow, apex truncate with 3 openings. Seeds subovoid, shining brown. Fl. Apr-May, fr. Sep.
● Open forests on hillsides; 1200-2200 m. Anhui, Gansu, Guangdong, Guangxi, Guizhou, Hubei, Hunan, Shaanxi, Sichuan, E Xizang, SE Yunnan, Zhejiang.