Stems twining to 2 m, terete, internodes with 2 lines of hairs. 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 deeply cordate with rounded and incurved lobes, apex short acuminate; basal veins 5, lateral veins 3 or 4 pairs; stipulelike axillary leaves present. Inflorescences subsessile, racemelike, to 3.5 cm, 10-20-flowered; cymules 2-flowered, in regular spiral; peduncle to 2 cm, often shorter than pedicels. Pedicel to 1.5 cm. Sepals ovate, ca. 1.5 mm, pubescent; basal glands up to 20. Corolla white or yellow-white, usually reflexed to rotate, glabrous; lobes oblong-lanceolate, ca. 5 × 1.7 mm. Corona white, cupular, membranous, 3.3-4 mm high, margin with 5 rounded teeth, plicate inside between teeth, these often well developed and appendagelike. Pollinia oblong. Fl. Sep.
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