Shrubs climbing. Stems terete, densely gray to white tomentose. Petiole 2-5 cm, densely tomentose; leaf blade cordate to ovate-cordate, 3.5-10 × 2.5-8 cm, papery, abaxially densely gray to white tomentose, adaxially densely strigose, veins palmate, 2-3 pairs from base, base cordate or auriculate, sinus 1-2 cm deep, apex obtuse or acute. Flowers solitary. Peduncle pendulous, 1.5-3 cm, densely tomentose; bractlets ovate to oblong, 5-15 × 3-10 mm, inserted on basal 1/3 of peduncle. Calyx yellowish with purple veins, throat purple, 4-5 cm; tube geniculately curved, abaxially densely white tomentose on tube; basal portion of tube 5-15 × 3-6 mm; limb discoid-rounded, 2-2.5 cm in diam., shallowly 3-lobed; lobes broadly ovate. Anthers oblong, ca. 1 mm. Gynostemium 3-lobed. Capsule cylindric to ovoid-cylindric with ribs undulate, ca. 3.5 × 1.5-2 cm, dehiscing basipetally. Seeds ovoid-deltoid, ca. 4 × 3 mm. Fl. Mar-Jun, fr. Aug-Oct.
Thickets, grasslands, on mountain slopes at elevations of 100-900 metres in S Anhui, Guizhou, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Shaanxi, Shandong, Shanxi, Zhejiang Provinces.
Can be grown by cuttings or seedlings. Seeds needs soaking.
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