Climbing shrubs, large, deciduous. Branchlets reddish to purplish, lenticels conspicuous; young branchlets whitish puberulent, soon glabrescent; pith white, large, lamellate. Petiole 1.5-4 cm, puberulent to glabrous; leaf blade ovate-oblong to ovate or ovate-orbicular, 5-15 × 3-8 cm, thinly papery, abaxially white arachnoid-pubescent throughout or only on midvein and lateral veins, hairs simple or 2- or 3-furcate, soon glabrescent or glabrous, glaucous or not abaxially, adaxially glabrous or sparsely puberulent when young, midvein and lateral veins conspicuously raised abaxially, subconspicuous to conspicuous adaxially, lateral veins 8-11 pairs, reticulate veinlets inconspicuous to subconspicuous with numerous distinct and raised parallel cross-bars abaxially, base broadly truncate to rounded or cordate, usually oblique, margin serrulate, apex acuminate to long acuminate. Inflorescences cymose, axillary, 1-7-flowered, brownish velutinous; peduncles 0.5-1.5 cm; pedicels 0.6-1.4 cm; bracts absent to 3 per pedicel, linear, small. Flowers yellow. Sepals 5, ovate to ovate-oblong, 4-5 mm, both surfaces velutinous, apex obtuse. Petals 5, obovate to oblong, 7-9 mm. Filaments 5-6 mm; anthers yellow, ovoid, 1.5-2 mm, sagittate at base. Ovary globose, ca. 2 mm in diam., densely tomentose; styles 3-4 mm. Fruit cylindric to subglobose, 1.5-2.5 cm, glabrous when mature, lenticels small; persistent sepals reflexed. Seeds ca. 2 mm. Fl. May-Jul, fr. Sep.