Stems twining, terete, internodes puberulent along 1 or 2 sides. Petiole 1.4-3.5 cm, slender, puberulent along adaxial groove; leaf blade lanceolate, 4.3-6(-8) × 1.5-2.5(-4.5) cm, adaxially sparsely pubescent, abaxially paler and more sparsely hairy, sometimes glabrous except for veins, base deeply cordate, basal lobes incurved and sometimes over-lapping, apex long acute to subacuminate; basal veins 5-7, lateral veins 3 or 4 pairs; minute stipulelike axillary leaves present. Inflorescences racemelike, 2-4 cm; cymules 2-flowered, in regular spiral; peduncle 0.4-2.5 cm, puberulent. Pedicel 3-7 mm. Sepals ca. 1.3 × 0.7 mm, puberulent. Corolla white, erect, glabrous; lobes oblong-lanceolate, 3.3-4.5 × 1.3-1.5 mm. Corona white, deeply cupular, ca. 2-3 mm high, concealing gynostegium, plicate, marginal lobes 5, bluntly triangular, up to 0.4 mm, alternating with well-defined, appendagelike plicae. Young fruit relatively broad, solitary. Fl. Jun-Aug.

Hedges. Sichuan, Yunnan.