Liana. Old stem slightly flattened, 0.7-1.2 cm ø, rather smooth, glabrous. Branches slightly flattened, 5-7 mm ø, smooth, glabrous, often with a series of 3 or 4 buds in the leaf axil. Leaves firmly chartaceous, suborbicular or broad-ovate in outline, 13.5-22.5 by 11.5-18.5 cm; glabrous above, sparsely minutely hairy beneath; apex acuminate; base deeply cordate, sinus 3-4 cm deep, auricles with almost rounded ends, separate from each other, sometimes overlapping; glabrous above, sparsely minutely hairy underneath; basal nerves 2 pairs, the inner pair ascending to the apical part of the blade, the outer pair much shorter and giving off at its base a strong branch resembling a third basal nerve pair; midrib with 2-3 pairs of lateral nerves; nerves elevated, prominent beneath, distinct or sometimes rather faint above; veins loosely transverse and reticulate, slightly elevated beneath, faint or invisible above; petiole stout, subterete except the apical part, 10-13 cm long. Inflorescences in axils of fallen leaves or cauligerous, paniculiform, up to 15 cm long, puberulous; bracts ovate, c. 2.5 mm long, puberulous on both surfaces. Pedicel and ovary 4-5 cm, puberulous. Perianth bright yellow or yellowish green, straight except the apical part of the tube together with limb curved or bent, with longitudinal and loosely reticulate veins, puberulous outside; utricle broad-ellipsoid, 5-6.5 by 3.5-4 cm, flanged at the base, without a contracted stipe, with 2 glandular, ellipsoid bodies (c. 1.5 mm long); tube c. 5 by 1.5-2 cm, hairy inside, especially dense at the apical part, basal part projecting a band-like syrinx (c. 1.5 mm wide) into the cavity of utricle; limb 3-lobed, lobes linear, up to c. 9 by 1 cm, glandular hairy on the inner surface. Stamens 10; anthers oblong, c. 4 mm long. Style column 10 mm long, 10-lobed; lobes lanceolate, 2-3 mm long, usually hairy in the apical part. Capsules unknown.
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