Strong perennial climbing to 10 m. or more; stems herbaceous, becoming thickened (up to 7 cm. across) and woody when old.. Leaf-blade broadly ovate-cordate in outline, shortly acuminate, acute, apiculate, glabrous except for a few hairs on the nerves, especially beneath, towards the base of the blade, 60–120 mm. long, 53–112 mm. broad, unlobed; petiole 20–68 mm. long, subglabrous.. Male flowers 5–25 or more in 25–80 mm. long panicles; peduncle 5–15 mm. long; pedicels 5–24 mm. long; receptacle-tube very shallow; lobes triangular-acuminate, 2–3 mm. long; petals dull brownish-orange, unequal, 2 large, broadly oblanceolate, erect, 12–15 mm. long, 3–5 mm. broad, 3 small, linear, recurved, 9–15 mm. long, 1–1.5 mm. broad; stamens 4, connate by anthers into two pairs; connective apically produced; fifth (unpaired) stamen represented by a small subulate staminode.. Female flowers solitary or more usually 2–4 paniculate on a 10–40 mm. long peduncle; pedicels 2–15 mm. long; ovary flask-shaped, 8–12 mm. long, 3.5–4.5 mm. across; receptacle-tube obsolete; lobes triangular, 1.5 mm. long; petals unequal, 3 broad, oblong-elliptic, 10–12 mm. long, 4–5 mm. broad, 2 narrow, linear, 10–12 mm. long, 1.5–2 mm. broad.. Fruits usually solitary or paired, the faces with 2 prominent curved longitudinal veins connected by a network of smaller veins, 62–77 mm. long, 23–38 mm. across the faces; peduncle 28–48 mm. long; pedicels 17–38 mm. long.. Seeds imbricate, ± 12, fusiform, with a broad wing arising slightly asymmetrically, 30–42 mm. long, with the body of the seeds 13–15 mm. long, 2.5–3 mm. across and the wing 22–27 mm. long, 8–11 mm. broad.
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