Vines suffruticose. Branches shallowly 4--6-grooved, glabrous. Leaves ternate; petiole 7--12 cm, glabrous, basally strongly dilated and connate to opposite petiole; leaflet blades lanceolate, broadly lanceolate, or narrowly ovate, 3--11 × 1--3. 2 cm, papery, abaxially glabrous, adaxially sparsely appressed puberulous, base rounded, subcordate, or broadly cuneate, margin sparsely denticulate or entire, apex attenuate to acuminate; basal veins abaxially nearly flat to ± prominent. Cymes axillary, 1--3-flowered, glabrous; peduncle 1.2--6.5 cm; bracts linear, 3--6 mm. Flowers 2.5--3 cm in diam. Pedicel 1--4 cm, glabrous. Sepals 4, yellowish, erect, oblong to oblong-ovate, 1.8--2.7 × 0.9--1.2 cm, abaxially glabrous except for velutinous margin, adaxially sparsely appressed puberulous near apex, apex ± acute. Stamens 1.2--1.9 cm; filaments densely pubescent; anthers narrowly oblong, 3--3.2 mm, abaxially densely yellowish pubescent on connective, apex with a 0.1--0.2 mm apicula. Ovaries pubescent. Style ca. 9 mm, densely villous. Achenes narrowly obovate to narrowly rhombic, ca. 5 × 2 mm, pubescent; persistent style 3.5--4 cm, plumose. Fl. Jul--Aug, fr. Sep--Oct.
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