Twiner up to c. 8 m high. Branches terete, 1.5-3 mm ø. Leaves thin-chartaceous, ovate (in outline), 5-13 by 4-6 cm; apex acuminate; base cordate, auricles almost oblong, 1.5-3 by 1-2 cm, rounded, the sinus 1.5-3.5 cm deep, glabrous above, lower surface sparsely shortly hairy, sometimes glaucous; basal nerves 1 pair, ascending upward to the apex, each with 1-3 branches along the inner margin of the auricles, slightly elevated beneath, faint above; veins loosely transverse or reticulate, distinct beneath, obscure or invisible above; petiole subterete, 3-7 cm, glabrous. Inflorescences in the axils of foliage leaves, rarely cauligerous, spiciform, up to 2 cm long, slightly short-hairy; bracts ovate, 2-10 (-20) mm long, sparsely puberulous on both surfaces. Pedicels and ovary 6-13 mm long, sparsely puberulous, glabrescent. Perianth pale yellowish green and somewhat purplish at the base, brownish, or dark brown, straight, with loosely reticulate veins, glabrous outside; utricle broad-ellipsoid, 10-12 by c. 5 mm, sparsely, shortly hairy inside, with 2 glandular, elliptic bodies (1.5-2 mm long); tube cylindric, 5-11 by 1-2.5 mm, sparsely hairy inside; limb 1-lipped, narrow lanceolate, 15-25 by 3-6 mm, shortly hairy on the upper surface. Stamens 6; anthers oblong, c. 0.6 mm long. Style column c. 1.5 mm long; lobes 6, triangular, c. 0.5 mm long, with a continuous, annular ring at their base. Capsules ellipsoid, 2.5-3 by 1.5 cm, slightly 6-ridged. Seeds triangular, 4 by 3.5 mm, not winged, granular on both surfaces, central part of the upper surface with a longitudinal ridge.
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