Prain & Burkill, J. Proc. Asiat. Soc. Bengal 10: 21 (1914)
Climber to 5 m. Tubers, a form where the spreading basal part is short) slender, spreading, to 5 mm in diam., cylindric to clavate, with thickened globose to subglobose apices 5–8 cm in diam., annually replaced. Indumentum present in some races as simple hairs, 0.1–0.6 mm long, on young shoots, leaves and inflorescence axes, never on ovaries or capsules. Stems 0.5–3 mm in diam., twining to the left, towards base slightly woody, usually unarmed. Leaves 3-foliolate, alternate, chartaceous, leaflet margins entire, apices acute to acuminate; terminal leaflet blades broadly obovate to oblanceolate, 1- veined or rarely 3-veined, base acute to attenuate; lateral leaflet blades ovate to broadly ovate, usually asymmetric, base acute to narrowly cuneate; cataphylls 3.5–4.2 by 3.5–5 mm, ovate to broadly ovate; lateral nodal organs absent; bulbils 25–30 by 3–10 mm, mostly cylindrical or clavate, sometimes ovoid to globose, epidermis thin, usually warty or pitted, grey brown to brown. Inflorescences pendent, spicate; male simple or compound, 1–2 per axil; female inflorescences simple, 1 per axil. Male flowers with outer tepals 1.0–1.2 by 0.7–0.8 mm, obovate, inner tepals 0.8–1 by 0.5–0.7 mm, narrowly obovate; stamens 3, staminodes 3, filiform to clavate. Capsules, 12.5–17 by 8.5–13 mm, mature capsules reflexed. Seeds 3.3–4.5 by 2.5–3 mm, ovoidlenticular, wing extending from seed base, 6.2–10.1 by 4.0–5 mm, oblong.