Slender vine. Branches terete, sulcate, 2-6 mm ø, glabrous. Leaves chartaceous or membranous, ovate or broad-ovate, 12.5-21.5 by 8-12.5 cm; apex acuminate; base cordate, sinus (1-) 2-3 cm deep, auricles separate from each other, sometimes overlapping at the base; glabrous on both surfaces, sometimes slightly puberulous on midrib, nerves and veins beneath when young, glabrescent; basal nerves 1 pair, ascending upward to ⅔-¾ of the blade, forked at base; lateral nerves c. 3 pairs; nerves elevated and prominent beneath, distinct or flat above; veins loosely reticulate, some crossbar-like, distinct beneath, rather faint above; petiole (2-) 4-7 cm, glabrous. Inflorescences in the axils of foliage leaves, racemiform, rachis up to 3 cm long, with visible internodes, sparsely puberulous or glabrous; bracts ovate to lanceolate, 2-3 mm long, puberulous on both surfaces especially on the margin. Pedicel and ovary 17-22 mm, puberulous. Perianth straight or slightly curved, with a distinct stipe (4-5.5 mm), venation visible, puberulous outside, hairy inside; utricle subglobose, 5-7 mm ø, with 2 glandular, suborbicular bodies (c. 0.5 mm ø); tube c. 20 by 4 mm; limb 1-lipped, narrow-elliptic, 50-60 mm. Stamens 6; anthers oblong 0.6-1 mm long. Style column c. 4 mm long, 6-lobed; lobes triangular, c. 1 mm long, with an annular ring around the base. Capsules (young) subglobose or short-cylindric, c. 1.5 cm ø.
In thickets and forests near or along streams at low altitudes. Fl. Feb.-March, Aug.; fr. Aug., Sept.
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