Climbing shrubs, large, deciduous. Floral branchlets sparsely villous, lenticels inconspicuous, two-year-old branches glabrous, lenticels subconspicuous; pith brown, lamellate. Petiole 2.5-4 cm, sparsely puberulent; leaf blade abaxially pale green, adaxially green, obovate, 9-12 × 6-8 cm, papery, abaxially sparsely white-and long pubescent, hairs simple to furcate to substellate, adaxially subglabrous, midvein and lateral veins abaxially conspicuous, adaxially inconspicuous, lateral veins 7 or 8 pairs, reticulate veinlets subconspicuous with distinct and raised parallel cross-bars abaxially, base narrowly rounded-cordatulate, margin ciliate-serrulate, apex acute to cuspidate. Inflorescences cymose, 1-3-flowered, brownish puberulent; peduncles 4-6 mm; pedicels 7-11 mm; bracts linear, ca. 2 mm. Flowers yellowish, ca. 2 cm in diam. Sepals ovate to narrowly ovate, 5-6.5 mm, abaxially velutinous. Petals 6, spatulate-obovate, 1-1.3 cm. Filaments 4-5 mm; anthers yellow, oblong, ca. 2 mm, sagittate at base. Sterile ovary globose, densely tomentose. Fruit unknown. Fl. May-Jun, fr. unknown. 2n = 58*.
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