Vines woody. Branches, petioles, peduncles, and pedicels densely pubescent. Branches shallowly 8--10-grooved. Leaves ternate; petiole 3.5--11 cm; leaflet blades ovate, narrowly ovate, or ovate-elliptic, 5--11 × 2.2--6 cm, papery, abaxially ± densely pubescent, adaxially sparsely appressed pubescent, base rounded to broadly cuneate, margin denticulate, apex acuminate; basal veins abaxially prominent. Cymes axillary, 3--10-flowered; peduncle 0.8--7 cm; bracts simple, lanceolate to linear, 1--2 cm, sometimes foliaceous and ternate. Flowers 1.5--2 cm in diam. Pedicel 2--5 cm. Sepals 4, yellowish, erect, lanceolate-oblong to oblong-ovate, 1.6--2.2 × 0.5--0.8 cm, papery, abaxially densely yellowish brown velutinous, adaxially sparsely puberulous only near apex, apex ± acute and often recurved. Stamens 1--1.7 cm; filaments basally pubescent, apically villous; anthers narrowly oblong, 2.5--3.5 mm, glabrous, apex obtuse. Ovaries puberulous. Style ca. 1 cm, densely villous. Achenes subfusiform, 4.5--6 × 1--1.2 mm, puberulous; persistent style 3--4 cm, plumose. Fl. Jan--Feb, fr. Mar--Apr.
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