Description from Flora of China
Trees, with rough, gray bark. Branches numerous, horizontally spreading; young shoots puberulent. Leaves 12-15 cm; stipules caducous, lanceolate; leaflets 3-5; petiolules 8-10 mm, initially puberulent, ultimately glabrous; blades green when young, shiny when old, suborbicular, occasionally rhombic-obovate, 3.5-6 cm, puberulent when young, glabrous when old, apex rounded, shortly caudate. Panicles axillary, short, ca. 7 cm; rachis and bracteoles puberulent. Flowers nearly sessile, fragrant; bracts caducous, lanceolate. Calyx campanulate, 6-7 mm, enclosed within 2 large, broadly ovate, membranous, very caducous bracteoles, outside puberulent, 5-toothed; teeth shorter than tube, upper pair rounded, lateral 2 subacute, shorter than lowest, lowest rather narrowly lanceolate. Corolla yellowish white; petals rather long clawed; standard broadly obovate, emarginate; wings and keel oblanceolate, base without auricles, cuneate, attenuate to claw. Stamens 9, monadelphous. Ovary oblong, pubescent, with rather long stipe ca. 4.5 mm, 4-6-ovuled; style very short; stigma capitate. Legume pale brown when dry, linear-oblong to strap-shaped, 4-8 × 0.6-1.2 cm, leathery, glabrous, faintly veined opposite 1 or 2(or 3) seeds. Seeds reniform, compressed. Fl. Mar-Apr, fr. Jun-Nov.
Cultivated; 900-1500 m. Fujian, Guangdong, Hainan, Taiwan, Zhejiang [native to India; widely cultivated in the tropics].