Vines climbing. Stem slender, woody. Petiole 0.8--2 cm, narrowly winged for ca. 1/3 its length; tendrils well developed. Leaf blade ovate or broadly so, 2.5--5.5 × (1--)1.5--3.8 cm. Male inflorescence: peduncle 5--10 mm, slightly compressed; umbel 5--9-flowered, base slightly thickened, 1--1.5 mm in diam.; pedicels very slender, 1--1.2 cm. Male flowers: perianth narrowly ellipsoid to narrowly obovoid, 6.5--9 × 2.5--3.5 mm, tapering toward base, apically contracted to orifice; stamens 6(or 9); filaments connate throughout, forming a fusiform-cylindric column 5.5--6 mm, apically 1.5--1.8 mm thick; anthers ovate-deltoid, 1--1.5 mm. Female flowers and fruit unknown.

* W Yunnan (Binchuan Xian).