Climbing shrubs, large, evergreen. Floral branchlets long or short, short ones densely brownish tomentose, long ones sparsely velutinous, lenticels inconspicuous, two-year-old branches glabrous; pith white, lamellate. Petiole 2-7 cm, thinly brown velutinous; leaf blade pale green abaxially, green adaxially, ovate to oblong, 7-13 × 4-9 cm, softly leathery, abaxially densely brownish appressed stellate tomentose, adaxially glabrous, lateral veins 8 or 9 pairs, veinlets reticulate, inconspicuous with subconspicuous transverse veins abaxially, base rounded or cordatulate, margin callose-serrulate, apex acute to cuspidate. Inflorescences cymose, 1-3-flowered, brownish, long tomentose; peduncles 2-7 mm; pedicels 5-6 mm; bracts linear, minute. Flowers white, ca. 1.5 cm in diam. Sepals 5, oblong, 4-5 mm, abaxially densely tomentose. Petals 5, obovate, 9-10 mm, gradually narrowed at base, apex rounded. Filaments 4-6 mm; anthers yellow, ovoid, ca. 1.5 mm, sagittate at base. Ovary globose, densely yellowish tomentose; styles ca. 4 mm. Fruit ovoid to cylindric-oblong, 2-3.5 cm, to 1 cm in diam., densely brownish tomentose when young, sparsely so when mature, lenticellate; persistent sepals present. Seeds small, 1-1.5 mm. Fl. Apr-May, fr. Nov. 2n = 58*.