Herbs twining; roots fusiform or globose. Stems angled, glabrous. Petiole 7-10 cm, glabrous; leaf blade cordate, 8-14 × 5-11 cm, both surfaces glabrous, veins palmate, 2-3 pairs from base, base cordate, sinus 1-2.5 cm deep, apex obtuse. Flowers 1-3 per axil. Peduncle ascending, ca. 1.5 cm, glabrous; bractlets ovate, ca. 5 × 6 mm, inserted near base of peduncle. Calyx yellow-green, throat dark purple; tube rectilinear, abaxially glabrous; utricle globose, ca. 5 mm in diam., sessile; tube ca. 9 × 1.5 mm; limb unilateral, ligulate, oblong, ca. 2 × 0.4 cm, apex obtuse or mucronulate. Anthers elliptic, 0.3-0.4 mm. Gynostemium 6-lobed. Capsule obovoid, ca. 3 × 2.5 cm, dehiscing acropetally. Seeds ovoid, ca. 4 × 3 mm. Fl. Nov-Apr, fr. Jun-Oct.
Thickets, valleys, limestone mountain slopes; at elevations from 100-1,600 metres.
Can be grown by cuttings or seedlings. Seeds needs soaking.
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