Lianas, woody. Stems canaliculate or angulate, brownish puberulent; tendrils compressed when young, later cylindric. Stipules caducous; petiole 1.5-2 cm; leaf blade suborbicular, 3.5-4.5 × 3-5 cm, papery, abaxially pubescent when young, later glabrous, adaxially glabrous, primary veins 7, base trun­cate or cordate, apex bifid to only 1/6, lobes obtuse or rounded at apex. Inflorescence an elongated raceme, 10-20 cm, more than 50-flowered, axillary, or a terminal panicle of 2 or 3 racemes; bracts linear, ca. 5 mm; bracts and bracteoles brush­like in young inflorescences. Flower buds ellipsoid, ca. 3 mm, apex open with 5 teeth. Hypanthium cupular. Flowers small, 3 or 4 whorls per inflorescence node; pedicel 10-15 mm, slender, pubescent. Calyx lobes 5, triangular-lanceolate, 2-2.5 mm, out­side pubescent. Petals subequal, obovate or oblong, 3.5-4 × 1.5-2.8 mm including a claw 1-1.5 mm, outside from middle to apex hairy. Fertile stamens 3; filaments 6-7 mm, glabrous. Staminodes 2. Floral disk annular, with lobes, fleshy, swollen. Ovary glabrous, with a slender stalk, oblique; style ca. as long as ovary stalk; stigma capitate, small. Legume unknown. Fl. Aug.

● Riverbanks; ca. 1300 m. Yunnan.