Shrubs climbing. Stems terete, pubescent, glabrescent. Petiole 1.5-4 cm, pilose or glabrous; leaf blade ovate to narrowly ovate, 6-14 × 4-8 cm, papery or leathery, abaxially pubescent or glabrous, adaxially glabrous, veins palmate, 4-6 pairs from base, base shallowly cordate, sinus ca. 1 cm deep, apex acuminate or acute. Flowers in axils of leafy shoots, solitary. Peduncle pendulous, 3-5 cm, long pilose; bractlets subulate, 5-8 × 2-3 mm, inserted near base of pedicel. Calyx limb dark purple, throat yellow with purple striations; tube geniculately curved, abaxially pubescent; basal portion of tube 20-30 × ca. 6 mm; limb rounded, 2-2.5 cm in diam., 3-lobed; lobes semirounded. Anthers oblong. Gynostemium 3-lobed. Capsule narrowly cylindric, 3-4 × ca. 2 cm, dehiscing basipetally. Seeds ovoid-deltoid. Fl. May, fr. Aug.
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