Herbs twining. Stems to 1.5 m, slender, hollow when dry, glabrous. Petiole 1-2.5 cm, glabrous or sparsely minute pilose; leaf blade oblong or ovate-oblong, (3-)4.5-6.5(-7.5) × 1-2.5(-5.3) cm, membranous, adaxially sparsely short pilose, abaxially glabrous or glabrescent, base subcordate, margin ciliate, apex acuminate. Inflorescences 2-8-flowered; peduncle 0-8 mm. Pedicel 5-10 mm, glabrous. Sepals linear, 2-3 mm, glabrous. Corolla 2.2-3 cm; tube base dark when dried, inflated for ca. 4 mm, upper part pale with conspicuous dark blotches, throat 5-8 mm wide; lobes ligulate-oblong or spatulate, dark at base and expanded tips, rest pale with elongated dark spots, 0.9-1.5 cm, glabrous, keeled inside, margin long ciliate. Outer corona cupular; lobes triangular, apex 2-toothed, hirsute ciliate; inner ligulate-linear, subobtuse, glabrous. Fl. Jun.
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