Vines shortly hairy. Roots (from N Thailand) 4--7 mm thick. Stems to 70 cm, base woody. Leaves alternate; petiole 2--3 cm, slender; leaf blade ovate to broadly so, 7--10 × 3--6 cm, membranous, veins 11--13, base deeply cordate, apex acuminate. Inflorescences axillary, racemes, few flowered; peduncle filiform, 1.5--2 cm; bracts small, ca. 3 mm. Perianth segments pink, 10--15 × 3--4 mm, margin of inner ones crenulate, apex acute. Stamens equaling or longer than perianth; filaments very short; anthers 5--6 mm, separated by a lamellate outgrowth of connective; appendage apical, with a fleshy outgrowth below apex. Capsule (from N Thailand) globose-ovoid, 8--10 × 6--9 mm, 1-or 2-seeded.
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