Shrubs climbing, slightly herbaceous. Stems terete, striate, pubescent to subglabrous. Petiole ca. 3 cm, pubescent; leaf blade ovate to ovate-cordate, 6-9 × 5-11 cm, subleathery, abaxially sparsely pubescent, adaxially glabrous, veins palmate, 3 pairs from base, base cordate, palmately 5-7-lobed, basal lobes ovate, 2-3 × ca. 1.5 cm, lateral lobes spatulate or oblanceolate, shorter and narrower than middle lobe, middle lobe spatulate-obovate, 2-9 × 1-3 cm, apex acute. Flowers in axils of leafy shoots, solitary. Peduncle often pendulous, ca. 3 cm, densely pubescent; bractlets oblong-ovate, ca. 1 × 0.5 cm, slightly amplexicaul, inserted at middle of pedicel. Calyx brownish, 5-6 cm; tube horseshoe-shaped, abaxially pubescent; basal portion of tube ca. 2.5 × 0.7 mm; limb discoid, oblique, ca. 1.5 × 1 cm, shallowly 2-lobed, orifice with slightly raised ring. Anthers oblong, ca. 1.5 mm. Gynostemium 3-lobed. Capsule ovoid-fusiform, ca. 6 × 1.5 cm, dehiscing basipetally. Seeds ovoid-triangular, ca. 4.5 × 5 mm. Fl. Apr.
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