Herbs twining; roots linear or terete. Stems terete, striate, glabrous; branchlets and petiole with red juice when broken. Petiole 2-10 cm, glabrous; leaf blade ovate-cordate, 3-15 × 3-16 cm, papery, densely punctate, both surfaces glabrous, rarely abaxially pubescent, veins palmate, 3 pairs from base, often red when dry, base cordate, sinus 2-4 cm deep, apex obtuse. Flowers axillary, solitary or paired. Peduncle ascending, 1-2 cm, glabrous; bractlets ovate, 3-8 × 2-4 mm, inserted near base of peduncle. Calyx dark purple; tube rectilinear, abaxially glabrous; utricle globose, ca. 5 mm in diam., sessile; tube 4-5 × 1-2 mm; limb unilateral, ligulate, ovate-oblong, 0.8-1 × 0.4-0.5 cm, apex obtuse or emarginate and apiculate. Anthers elliptic, 0.3-0.4 mm. Gynostemium 6-lobed. Capsule cylindric, ca. 2.5 × 1.5 cm, dehiscing acropetally. Seeds ovoid or ovoid-deltoid, ca. 4 × 3.5 mm. Fl. Apr-Aug, fr. Oct-Dec.
Can be grown by cuttings or seedlings. Seeds needs soaking.
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