Lianas, woody, with compressed tendrils. Stems and branches with small, protruding pits; young branches and inflo­rescence puberulent. Stipules caducous; petiole 1.5-4.5 cm, slender; leaf blade broadly ovate or ovate, 4.5-7 × 3.5-7 cm, papery, abaxially shiny brownish pubescent when young, grayish pubescent when old, adaxially glabrous, primary veins 7-9, veins convex on both surfaces, base truncate to shallowly cordate, apex bifid to 1/3-1/2; lobes widely divergent, apex acuminate. Inflorescence a raceme or several racemes joined in a panicle, terminal or axillary, 7-15 cm, many flowered, brownish pubescent; bracts 3-4 mm; bracteoles ca. 1.5 mm. Pedicel 3-5 mm, stout, pubescent. Flower buds ellipsoid, ca. 5 mm, tapering at both ends. Receptacle funnelform; calyx lobes 5, erect at anthesis, lanceolate. Petals white, elliptic or obovate, ca. 4.5 × 2.5-3 mm, outside with golden hairs on midvein, claw 1.5-2 mm. Fertile stamens 3; filaments ca. 5 mm, glabrous. Staminodes 2 or 3. Floral disk not swollen. Ovary stalked, oblique, hairy on sutures and at base; style glabrous; stigma small. Legume oblong, compressed, ca. 6 × 2 cm, glabrous when mature; valves woody, smooth. Seeds 2, blackish, broadly elliptic, compressed, ca. 10 × 8 mm. Fl. Sep-Oct, fr. Oct-Dec.

● Open forests and disturbed habitats on karst hills; ca. 1300 m. Yunnan.