Vines woody. Branches shallowly 8-grooved, yellowish puberulous. Leaves simple; petiole 4--9 cm; leaf blade broadly ovate to suborbicular, 9--14 × 8--11.8 cm, papery, abaxially densely puberulous, adaxially sparsely pubescent to subglabrous, base rounded-cuneate to truncate, margin unequally dentate, apex caudate-acuminate; basal veins abaxially ± prominent. Cymes axillary or terminal, 1--11-flowered; peduncle 1--4.3 cm, spreading puberulous; bracts linear-lanceolate, 2--3 cm. Flowers ca. 8 mm in diam. Pedicel 1.5--4 cm, puberulous. Sepals 4, greenish, erect, long elliptic to ovate-lanceolate, ca. 12 × 3--4 mm, abaxially densely appressed puberulous, adaxially sparsely puberulous only near apex, apex ± acute. Stamens ca. 9 mm; filaments densely pubescent; anthers narrowly oblong, ca. 2 mm, glabrous, apex obtuse. Ovaries puberulous. Style ca. 9 mm, densely villous. Achenes narrowly ovate, ca. 3 × 1.4 mm, puberulous; persistent style 2--2.5 cm, plumose. Fl. Dec, fr. Apr.
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