Shrubs climbing. Stems terete, densely yellow villous. Petiole 1.5-4 cm, densely villous; leaf blade ovate-elliptic to oblong-elliptic, 10-23 × 7-12 cm, leathery, abaxially densely yellowish villous, adaxially glabrous or yellowish villous along veins, veins pinnate, 5-8 pairs, base narrowly auriculate, sinus 0.5-1.5 × 0.2-0.4 cm, apex acute or shortly acuminate. Flowers axillary, solitary or paired. Peduncle pendulous, 1-2.5 cm, densely brown villous; bractlets triangular. Calyx reddish purple with dark purple veins on the tube, limb purple or yellow, 5-7 cm; tube geniculately curved, abaxially densely yellow-brown villous on tube; basal portion of tube ca. 20 × 6-10 mm; limb discoid-rotund, ca. 2 cm in diam., 3-lobed; lobes broadly ovate to deltoid. Anthers oblong, ca. 2 mm. Gynostemium 3-lobed. Capsule cylindric, 6-8 × ca. 2.5 cm, dehiscing basipetally. Seeds ovoid-deltoid, 5-6 × 3-4 mm. Fl. May-Jun, fr. Jul-Aug.
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