Climber or trailer to 1.2 m.; roots fibrous; stems slender, glabrous or slightly hairy, smooth or slightly rough. Leaf-blade triangular, hastate or sagittate, ± scabrid-punctate above, smooth and glabrous except for a few hairs on nerves beneath, subentire or ± sinuate-dentate or rarely lobulate, 23–91 mm. long, 22–110 mm. broad; lobes triangular or rarely ovate-triangular, minutely apiculate; petiole 12–54 mm. long. Monoecious. Male flowers 1–3, axillary, or at nodes on 30–95 mm. long leafless shoots with shortened internodes and then appearing racemose; pedicels slender, 4.5–15 mm. long; receptacle-tube campanulate, 1.5–2 mm. long; lobes triangular-subulate, 0.3–0.8 mm. long; petals white, becoming cream when older, 2–4 mm. long, 1–2 mm. broad, united at the base; stamens 3, subsessile. Female flowers solitary on slender 7–40 mm. long pedicels; ovary fusiform, sometimes slightly collared at the base, 3.5–16 mm. long, 0.5–1.5 mm. across; receptacle-tube cylindrical to broadly campanulate, 1–2.5 mm. long; lobes subulate, 0.5–1.5 mm. long; petals 2–6 mm. long, 1.5–2.5 mm. broad, united at very base. Fruit pendulous on a 5–37 mm. long stalk, fusiform, smooth, glabrous, 15–45 mm. long, 7–14 mm. across. Seeds ovate in outline, compressed, narrowly bordered, smooth, 3.5 × 2 × 0.5 mm. Fig. 21/11, 12, p. 120.