Climber to 4 m. Tubers often 2–3(–5), to at least 50 cm long and 3–7 mm in diam., spreading, cylindric with thickened 1.8–3.2 by 1.8–3 cm globose to capitate apices and short side branches, annually replaced, subtended by a woody crown. Indumentum absent, white waxy coating absent. Stems 1.5–2.5 mm in diam., twining to the right, annual, unarmed, with fine longitudinal ridges and furrows most easily seen near the nodes in herbarium specimens. Leaves simple, opposite, blades narrowly lanceolate to elliptic-oblong, 3-veined, chartaceous, margins entire, base obtuse to rounded, apex acute to acuminate; petioles 0.7–2.7 cm long; cataphylls, bulbils and lateral nodal organs absent. Inflorescences spicate, pendent, tepals inserted on discoid torus, free, erect, fleshy in texture with inner whorl tepal often thicker than outer; male inflorescences simple or compound, compound inflorescences 1(–2) per axil, simple/partial inflorescences 1–5 per axil, peduncles 1.5–5 mm long, axes 1.1–4.4 cm long; female inflorescences simple, 1(–2) per axil. Male flowers with outer tepals 0.7–1.5 by 0.7–1.2 mm, ovate to narrowly obovate, inner tepals 0.6–1.4 by 0.5–0.9 mm, obovate, margins thickened, especially towards apex; stamens 6. Capsules 10–12 by 21–24 mm. Seeds 2.5–4 by 3–4.5 mm, lenticular-ovoid, wings 10.5–13 by 9.5–11.5 mm, extending all around seed margin.