Shrubs climbing. Stems terete, striate, shortly hirsute, then glabrescent. Petiole 1-2 cm, shortly hirsute; leaf blade broadly oblong-oblanceolate, linear, or oblong, 7-20 × 1-10 cm, leathery, abaxially densely villous, then glabrescent, adaxially glabrate, veins palmate, 7-12 pairs from base, base narrowly auriculate, sinus 0.3-0.5 cm deep, margin entire to shallowly 2-or 3-lobed, apex acute. Flowers axillary, sometimes on old woody stems, solitary or paired. Peduncle pendulous, 3-4 cm, villous; bractlets subulate, 3-5 mm, inserted near base of peduncle. Calyx dark red or dark brown, 4-5 cm; tube horseshoe-shaped, abaxially brown villous; basal portion of tube 20-30 × 3-4 mm; limb discoid-orbicular, 1.5-3 cm in diam., shallowly 3-lobed; lobes broadly ovate. Anthers oblong, ca. 3 mm. Gynostemium 3-lobed. Capsule cylindric, ca. 4 × 2 cm, dehiscing basipetally. Seeds ovoid, 3-4 × 2-3 mm. Fl. May-Sep, fr. Oct-Dec.
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