Description from Flora of China
Dalbergia marginata Roxburgh, Fl. Ind., ed. 1832, 3: 230. 1832.
Lianas, glabrous except for pilose calyces and ovaries. Leaves 5- or 7-foliolate; rachis 13-25 cm, including petiole (3.5-)5-10 cm; leaflet blades obovate-elliptic to obovate, 5-15 × 2.5-6 cm, subleathery, secondary veins 6-8(-10) on each side of midvein and slightly prominent, base rounded, apex shortly and obtusely acuminate. Pseudopanicles axillary, 6-20 cm, with few branches, glabrous; rachis nodes with 1-3 fascicled flowers. Pedicel 5-12 mm. Flowers 1-1.2 cm. Calyx shallowly cup-shaped, 2-3 mm. Corolla whitish to pale red, 8-10(-12) cm, glabrous; standard broadly ovate. Ovary sessile, glabrescent. Legume ligulate-oblong, 7-10(-15) × 2-4 cm, thin, glabrous, reticulate veined; abaxial suture with a 2-3 mm wide wing, adaxial suture with a 6-8 mm wide wing. Seeds 1(or 2) per legume. Fl. Apr-May, fr. Nov-Jan.
The place of publication of the basionym is often given incorrectly. Roxburgh used the epithet "marginata" in Flora Indica for distinct species in two genera. Both were treated by Bentham as species of Derris. In making the transfer of Dalbergia marginata, Bentham cited the wrong page number. See R. Geesink (Leiden Bot. Ser. 8: 110. 1984) for discussion.
Open or dense forests, mountain slopes; 400-600 m. Guangdong, Guangxi, Guizhou, Yunnan [Bangladesh, India, Laos, Myanmar, Nepal, Thailand, Vietnam].