Woody climbers. Young branchlets puberulent, glabres­cent. Stipels subulate, 2-3 mm; petiolules 3-5 mm, glabrous or sparsely hairy; leaflets equal in shape, oblong, elliptic, or broadly obovate, 7.5-13 × 3-6 cm, leathery to thickly leathery, glabrous or ± puberulent abaxially, glabrous and shiny adaxi­ally, midrib raised abaxially, flat or slightly impressed adaxially, lateral veins slightly raised on both surfaces, veinlets obscure, base rounded, apex acuminate or rounded and with a short blunt mucro. Panicles axillary, solitary or 2 or 3 fascicled, sparsely brownish puberulent or glabrescent. Pedicels as long as or slightly shorter than calyx; bracteoles linear, caducous. Calyx ca. 4 mm; teeth bluntly triangular, 1.5-2 mm, sparsely puberu­lent outside, slightly hairy inside. Corolla purplish red; standard orbicular, 5-6 mm in diam., apex emarginate; wings and keel oblong, subequal in length, apex rounded, base with a rounded auricle on one side. Anthers equal in size. Ovary sessile, hairy. Legumes 8-9 cm, 2.2-2.5 cm wide in lower part, 1.6-1.8 cm wide in upper part, adpressed brownish puberulent, apex obtuse, without stipe. Seeds blackish, dull, oblong or narrowly elliptic, 1.9-2.9 × 1-1.3 cm. Fl. Mar, fr. Jun-Jul.

Sparse forests, streamsides. Hainan (Baisha, Danxian) [Laos, Viet­nam].