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Sarmentose shrub 1–3.5 m high or liana to 20 m long, deciduous, flowers appearing with the leaves, trunk to 10 cm in diameter, bark reddish brown or grey-brown; branches scabrid; branchlets densely hispid; latex clear, white or yellow. Leaves opposite; blade often convex, ovate or elliptic, 8–24 cm long, 5–17 cm wide, base cuneate, rounded or subcordate, apex obtuse, acute or acuminate, densely hispid on both surfaces but glabrescent above; petiole 1–5 mm long. Inflorescence 1–12-flowered, pedunculate, fairly congested, densely hispid in all parts; pedicels 3–20 mm long. Flowers fragrant; sepals narrowly ovate or linear, 9–27 mm long, acute; corolla white turning yellow, red-spotted inside; corolla tube 13–24 mm long, corolla lobes ovate, 3–16 mm long, 4–9 mm wide, narrowing into the 9–20 cm long pendulous tails, corona lobes 1–3 mm long. Fruit hard, the mericarps opposite-divergent, cylindrical or nearly so, 15–47 cm long, 1–2.6 cm in diameter, tapering to a knob, lenticellate, hispid and glabrescent; seeds 11–21 mm long, densely pubescent, with a stalked coma 6–14 cm long.