Slender vine; stems to 15 m long; young branches pubescent. Leaves: petiole 1–3 cm long; lamina narrowly ovate-elliptic to narrowly oblong-elliptic, 9–21 cm long, 2–9.5 cm wide, glabrous above, appressed or spreading pubescent mainly on veins below; base cordate; apex acuminate. Flowers axillary, solitary or paired, ± sessile. Calyx maroon with darker longitudinal and reticulate veins, pubescent outside; utricle 8–10 mm long; tube c. 15 mm long; lobes spreading, broadly obtuse, 5–7 mm long, dark maroon inside; apex obtuse. Fruit obloid, 3–6 (–10) cm long, 2–3 cm diam. Seed triangular, 6–8 mm long, 5–7 mm diam., 3–4 mm thick, convex on one side, deeply grooved on the other, smooth.
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