Climbing shrubs, large, deciduous. Branches reddish purple, with pale elliptic lenticels, inconspicuous when young, conspicuous when old, glabrous or very young branchlets brownish puberulent; pith brown, lamellate or solid. Petiole 1.5-2.5 cm, glabrous; leaf blade abaxially glaucous, adaxially green, ovate to narrowly ovate to oblong-lanceolate, 3.5-12 × 2.5-5 cm, papery, both surfaces glabrous, midvein and lateral veins distinct and raised abaxially, sulcate adaxially, lateral veins 5-8 pairs, base broadly cuneate to rounded, margin callose-serrulate, apex acuminate to long acuminate. Inflorescences cymose, axillary, 2-or 3-flowered, glabrous to sparsely rusty tomentose; peduncles ca. 1 cm; pedicels 0.7-1.5 cm; bracts linear, 1.5-2.5 mm. Flowers greenish yellow. Sepals 5 or 6, ovate, ca. 5 mm, abaxially glabrous, adaxially rusty tomentose, apex obtuse. Petals 5-7, ovate to obovate, ca. 1 cm, narrowed at base, apex rounded. Filaments ca. 4 mm; anthers yellow, ovoid. Ovary oblong, ca. 2 mm, ca. 1.5 mm in diam., densely brown tomentose. Fruit globose, ca. 3 cm in diam., densely tomentose when young, glabrous when mature, lenticels brown. Seeds ca. 1.5 mm. Fl. May-Jun, fr. Jul-Oct.
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