Vines suffruticose. Branches slender, shallowly 4--6-grooved, glabrous. Leaves ternate, glabrous; petiole 4--7.8 cm; leaflet blades oblong-lanceolate, ovate-lanceolate, or narrowly ovate, 4--11 × 1.6--3(--5) cm, papery, base rounded to broadly cuneate, margin entire or sparsely denticulate, apex attenuate to acuminate; basal veins abaxially prominent to nearly flat. Cymes axillary, 1--3-flowered, glabrous; peduncle 2--7(--15) cm; bracts short petiolate, lanceolate to elliptic, 1--9 cm. Flowers 2--3.5 cm in diam. Pedicel 1--4 cm, glabrous. Sepals 4, yellowish, erect, ovate-oblong to oblong, 2.5--3 × 1--1.2 cm, abaxially glabrous except for velutinous margin, adaxially sparsely appressed puberulous, apex acute. Stamens 1.5--1.8 cm; filaments densely pubescent; anthers linear, 3.5--4.2 mm, abaxially densely pubescent on connective, apex with a 0.4--0.6 mm apicula. Ovaries pubescent. Style ca. 1.2 cm, densely villous. Achenes narrowly obovate, ca. 5 × 2 mm, puberulous; persistent style 4--5 cm, plumose. Fl. Aug--Sep, fr. Sep--Oct.
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