Stems twining to 2 m, terete, pubescent along 1 side. Leaves opposite; petiole 2.5-4 cm; leaf blade ovate-oblong, 4-9 × 2-4 cm, thin papery, adaxially pubescent, densely so along veins, abaxially glabrescent and glaucous, ciliate, base auriculate-cordate, basal lobes rounded, incurved, apex short acuminate; basal veins 5, lateral veins 3 or 4 pairs; stipulelike axillary leaves present. Inflorescences corymbose, 10-20-flowered. Sepals ovate, ca. 1.5 mm, pubescent; basal glands up to 20. Corolla white or yellow-white, glabrous; lobes oblong-lanceolate, ca. 3.5 × 1.5 mm, rotate. Corona white, cupular, membranous, ca. 2 mm high, margin with 5 rounded teeth, plicate inside between teeth. Pollinia oblong. Follicles subfusiform, ca. 6.5 × 1 cm, glabrous, apex beaked, acuminate. Seeds broadly ovate, ca. 8 × 5 mm; coma 1-2 cm. Fl. Jul-Oct, fr. Sep-Dec.
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