Stems twining to 8 m, axillary tubers absent. Leaves: petiole 3-18 mm; blade ovate to elliptic, 2-16 × 0.5-9 cm, base of larger leaves proximal to inflorescence acute to cuneate, apex acute to obtuse. Inflorescences racemes or in branched panicles of racemes, 3-35(-70) cm; single bract subtending each pedicel oblong-oblanceolate, 1-2 × 0.2-0.5 mm; paired bracts subtending each flower deciduous, triangular, 0.6-1 × 0.5-0.8 mm, distinct. Flowers bisexual or functionally unisexual; sepals basally adnate to petals, keeled, becoming winged in fruit, cream-white, elliptic, 1.7-2 × 1-1.3 mm, apex obtuse; petals basally connate, cream-white, elliptic, 1.5-2.3 × 0.8-1.1 mm, apex obtuse, spreading at anthesis; stamens of bisexual and functionally staminate plants fleshy; filaments basally connate and dilated, 2.5-3.8 mm; anthers 0.8-1 mm; stamens of functionally pistillate plants reduced and sterile; pistils in bisexual and functionally pistillate plants 0.4-0.6 mm; styles 0.8-1.5 mm, basally connate 1/3-1/2 their length; stigmas clavate to bifid; pistils of functionally staminate plants reduced; pedicel 1-3 mm. Utricles with style bases persistent, not [rarely] produced in functionally staminate plants, obovoid, 1-1.4 mm.
A twining vine. It can be 15 m long. The roots form tubers. The stems are slender and have a reddish tinge. The leaves are alternate and 3-11 cm long by 2-7 cm wide. They are oval and fleshy. The base is rounded and the upper surface is dull. The flowers hang in groups from the axils of the leaves. These can be 10-20 cm long and the one at the end of the branches 30-50 cm long.