Stems herbaceous, twining, slender, glabrous or sparsely pilose. Leaves broadly ovate to orbicular, 3.5-6 by 3-6 cm, deeply cordate at the base, with rounded lobes, shortly acuminate at the apex, glabrous on both sides but shortly pilose near the entire, fimbriate margins; petiole 2-2½ cm, glabrous or sparsely hairy near the base. Inflorescences axillary; peduncles short, ½-½ cm, terete, glabrous or sparsely pilose, 1-2-flowered. Pedicels much longer than the calyx, thick, glabrous, 15-18 mm long, at first erect, in fruit turned down, thickened, and up to 20-28 mm. Sepals equal in length, 5-6 mm long, rather thick, glabrous, mucronulate, outer ones ovate-oblong, acutish, with very narrow scarious margin, inner ones broader, to orbicular, rounded at the apex, with broader scarious margin. Corolla funnel-shaped, ca 4½ cm long, yellow. Stamens exserted; filaments shortly pilose at the base. Ovary glabrous. Young capsule ovoid, mucronate, glabrous.
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