Twiner or scrambling vine. Old stem terete, 1.5 cm ø. Branches terete, 2-5 mm ø, pubescent when young, glabrescent. Leaves subcoriaceous or chartaceous, elliptic-lanceolate, oblanceolate, (10-) 17-26 by (2.5-) 5-9 cm; apex acuminate; base cordate with distinct auricles, or shallowly cordate with obscure auricles, sinus (0.5-) 1-2 cm deep; glabrous or sparsely shortly hairy above, short-hairy beneath; nerves prominent beneath, distinct above; basal nerves 1 pair, ascending upward to halfway the blade, lateral nerves 4 or 5 pairs; veins loosely reticulate or crossbar-like, slightly elevated beneath, rather faint above; petiole 2-3.5 cm, shortly hairy. Inflorescences in axils of leaves, or cauligerous, usually 1 or 3, simple or spiciform, borne on a knob-like, very short branch; rachides up to 16 cm long, with spacious internodes, densely shortly hairy; bracts very small, triangular or lanceolate, c. 1 mm long, densely hairy. Pedicel and ovary c. 22 mm long, densely hairy. Perianth slightly curved, whitish or creamy white with green, brown or purple distinct venation; with a contraction between perianth and ovary; pubescent outside, with rather scattered glandular hairs inside; utricle ellipsoid or obovoid, c. 15 by 8-11 mm; tube 17-23 mm long, variable in width (5-8 mm ø) in one flower; limb prominently 3 + 3-lobed: 3 triangular lobes (20-25 by 15 mm) and 3 alternate lobes (each lobe triangular, 15-20 by 10-15 mm, apical part, c. 50 mm, laciniate and tail-like when dry). Stamens 6; anthers oblong, 1.5-2 mm long. Style column c. 7 mm long, 6-lobed; lobes lanceolate, 2.5 mm long. Capsules not seen.
In primary forest, beside a river or on rocky ridge. Fl. Jan., July, Aug., Dec.; fr.--06.
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