Shrubs climbing. Stems terete, striate, densely brown tomentose. Petiole 4-8 cm, densely brown villous; leaf blade ovate or ovate-lanceolate to narrowly ovate, 12-20(-30) × 10-17 cm, leathery, both surfaces densely villous when young, then abaxially yellowish or brownish villous, adaxially glabrescent except villous along veins, veins palmate, 5-7 pairs from base, base rounded, apex shortly acuminate or acute. Racemes in axils of leafy shoots or on old woody stems, 3-6-flowered, ca. 3 cm. Pedicel pendulous, 3.5-4 cm, densely villous; bractlets subulate, ca. 2 × 1 mm. Calyx yellowish with dark purple lobes; tube geniculately curved, abaxially sparsely villous; basal portion of tube saccate, 20-30 × 10-25 mm, orifice nearly orbicular; limb obliquely trumpet-shaped, ca. 3 cm in diam., 3-lobed; lobes unequal, densely papillate, upper 2 oblong, lower one broadly deltoid. Anthers oblong, 2-2.5 mm. Gynostemium 3-lobed. Capsule narrowly cylindric, 7-10 cm × 2.5-3 cm, dehiscing basipetally. Seeds ovoid, ca. 6 × 4 mm. Fl. Oct-Feb, fr. Jun-Jul.
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