Understorey vine; stems to 30 m long; young branches ferruginous-pubescent, glabrescent. Leaves: petiole 1.5–3.5 cm long; lamina triangular-ovate to oblong-ovate, 10–20 (–26) cm long, 2.5–9.5 (–11.5) cm wide, appressed pubescent, glabrescent above, pubescent mainly on veins with straight and rarely hooked hairs below; base cordate; apex acuminate. Inflorescences axillary, condensed 2-or 3-flowered racemes on older stems. Calyx greyish white with purple veins, pubescent outside; utricle 14–17 mm long; tube 20–30 mm long; lobes erect, remaining joined together at apices, broadly triangular, 12–16 mm long, purple on revolute edge, yellow inside; apex filiform, 22–27 (–40) mm long. Fruit elongate-ovoid, 5–8 cm long, 2.5–3.5 cm diam. Seed not seen.
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