Climber to 3 m. Rhizome, richly and irregularly branched and lobed, approximately 5.5–16.5 by 0.8–2 cm, shallowly buried, periderm not hard and lacking rigid, spine-like roots. Indumentum present as papillae, 0.1–0.6 mm long, usually on veins of leaf lower surface, sometimes on young stems and inflorescence axes. Stems 2–5.6 mm in diam., twining to the left, annual, unarmed, terete, sometimes with shallow longitudinal ridges. Leaves simple, alternate, blade ovate to broadly ovate or deltoid, chartaceous, 7(–9)-veined, margins usually entire, sometimes with 3–5 shallow lobes, base widely cordate to subcordate, sometimes auriculate, apex acuminate; petioles (0.8–)3.2–9.5 cm long; cataphylls, lateral nodal organs and bulbils absent. Inflorescences pendent, axes angled, tepals fused at base, inserted on cup-shaped torus, free above; male inflorescences usually simple, rarely compound, compound inflorescences 1(–2) per axil, simple/partial inflorescences 1–2(–3) per axil, spicate, with apparently sessile cymules of 1–3 flowers, peduncles 0.3–2 cm long, axes 3–18 cm long; female inflorescences spicate, 1 per axil. Male flowers with tepals oblong, outer 1.1–1.5 by 1.1–1.2 mm, inner 1.2–1.8 by 0.7–1 mm, oblong, stamens 3, filaments filiform, connective bifid to form two divergent arms, anthers ovate-oblong, dorsifixed at the arm tips; staminodes 3, 0.25–0.4 mm long, filiform. Capsules 20–23 by 20–25 mm. Seeds 3.5 by 4 by 5–6 mm, ovoid-lenticular, wings 12.5–15.5 by 9.5–11 mm, extending all around seed margin.