Shrubs climbing, 3-5 m tall. Branchlets terete, densely stellate puberulent. Stipules lanceolate, needle-shaped, caducous; petiole 2-4 cm, stellate puberulent; leaf blade cordate or ovate-cordate, not lobed, 6-10 × 5-8 cm, densely stellate puberulent when young, glabrescent, densely stellate puberulent abaxially, verrucose adaxially, basal veins 5, base cordate, margin serrate, apex acute to acuminate. Inflorescences terminal or axillary, 2-3-flowered panicles, fascicled, or flowers solitary, densely stellate puberulent. Pedicel 3-5 cm. Epicalyx lobes 5, connate at base, much shorter than calyx. Calyx campanulate, connate for 1/2 length, ca. 1.8 × 3 cm, densely stellate puberulent, lobes 5, ovate-triangular. Corolla white, flushed purplish abaxially, campanulate, ca. 5 cm in diam.; petals obovate, 2.5-3 cm, bearded at base. Staminal column ca. 1.5 cm, glabrous; filaments free for ca. 4 mm. Style branches 5, glabrous or minutely hairy. Capsule ellipsoid, ca. 3.5 × 1.5 cm, densely stellate tomentose, apex acute; mericarps 5; persistent sepals foliaceous, ca. 2 cm. Seeds reniform, villous, hairs white, ca. 8 mm. Fl. Dec.
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