Vines perennial, herbaceous. Stems to 1 m, shallowly longitudinally 5- or 6-grooved, sparsely pubescent. Leaves usually ternate, sometimes pinnate, 5-foliolate or simple; petiole 4--8 cm; leaflet blades ovate, narrowly ovate, or broadly lanceolate, 3--7 × 1.5--5 cm, papery, both surfaces sparsely pubescent on veins or adaxially glabrous, base rounded, truncate, broadly cuneate, or subcordate, margin entire, apex acuminate to acute; basal veins abaxially ± prominent. Flowers solitary, terminal, 7--12 cm in diam. Pedicel robust, 3.5--10 cm, pubescent. Sepals 5, 6, or 8, white, obovate to elliptic, 3.5--6 × 1.5--3.5 cm, abaxially appressed pubescent to puberulous along central basal veins and velutinous along lateral basal veins, adaxially glabrous, margin glabrous. Stamens 1.2--2 cm, glabrous; anthers linear, 6--8 mm, apex obtuse or apiculate. Ovaries pubescent. Style ca. 9 mm, densely villous from base to middle. Achenes broadly ovate, 3.5--5 × 3--4.5 mm, appressed pubescent; persistent style 3--3.8 cm, yellow plumose. Fl. May--Jun, fr. Jun--Jul.

Forests, slopes, scrub; 200--1000 m. Liaoning, E Shandong, E Zhejiang [Japan, Korea].