Vines. Roots 1--1.5 cm thick. Stems erect, base woody. Leaves whorled; petiole 1--4 cm, slender; leaf blade ovate, ovate-lanceolate, or ovate-oblong, 4--9(--11) × 1.5--4.5 cm, veins 5--9, base subtruncate to rounded, rarely rounded-cordate or cuneate, margin slightly undulate, apex acuminate. Inflorescences cymes, 1-to several flowered; peduncle or pedicel borne on leaf midvein, 0.5--4 cm, slender; bracts narrowly lanceolate, ca. 3 mm. Perianth segments green, lanceolate, 10--15 × 2--3 mm, margin revolute. Stamens purple, slightly shorter than perianth; filaments ca. 1 mm, stout; anthers 2--2.5 mm; appendages adherent, with a silky hair on either side, adaxial one ca. 2 mm. Capsule oblong, 10--14 × 4--8 mm, often 2-or 3-seeded, apex obtuse. Fl. May--Jul.
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