Trees 5-15 m tall. Branchlets sparsely pubescent when young, glabrescent. Leaves 3-foliolate; petiole 4-7 cm; petiolules 5-12 mm; leaflets broadly lanceolate to oblong, glabrous, abaxially densely glandular, base cuneate and slightly oblique, margin entire or slightly undulate and ciliate, apex acuminate to acute; central leaflet 10-15 X 4-5 cm. Thyrses 7-17 cm; bracts linear, early deciduous. Calyx 1.8-2.5 cm, outside pubescent and glandular, inside glabrous. Corolla white, outside puberulent, lower lip pilose inside. Stamens included; filaments glabrous. Ovary glabrous. Fruiting calyx minutely 5-dentate to subtruncate. Fruit black, subglobose, ca. 7 mm in diam., with longitudinal veins when dry. Fl. and fr. Jul-Aug.

Mixed forests; 600-1200 m. S Yunnan [Bangladesh, Cambodia, India, Laos, Myanmar, Nepal, Thailand, Vietnam].