Vines woody. Stems 1--6 m; branches longitudinally 5-or 6-grooved, densely appressed puberulous. Leaves ternate; petiole 1.5--14 cm, puberulous; leaflet blades ovate, broadly ovate, or elliptic, 2--9(--13) × 1.6--7(--9.5) cm, papery, often indistinctly 3-lobed, abaxially puberulous, densely puberulous, or velutinous, adaxially puberulous, base rounded, rounded-truncate, or subcordate, margin distally sparsely 1-or 2(--5)-dentate or rarely entire, apex acuminate to acute; basal veins abaxially ± prominent to nearly flat. Cymes axillary or terminal, (3--)7-to many flowered; peduncle 1.8--9.5 cm; bracts petiolate, elliptic to broadly ovate, 1--4 cm, undivided or 3-lobed. Flowers 1--1.6 (--2.8) cm in diam. Pedicel 5--12(--28) mm, densely puberulous. Sepals 4, white, spreading, obovate-oblong to oblanceolate, 6--8(--15) × 2.2--3.2(--4) mm, abaxially appressed puberulous, adaxially velutinous, margin abaxially velutinous, apex obtuse. Stamens 4--6(--10) mm, glabrous; anthers narrowly oblong, 1.5--1.8 mm, apex obtuse. Ovaries pubescent. Style 4--6 mm, densely villous. Achenes oblong-ovate to fusiform, 3.5--4.5 × 1--2 mm, puberulous; persistent style 0.8--2.5(--2.7) cm, plumose. Fl. May--Sep, fr. Jun--Oct.
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A woody vine. The stems are 1-6 m long. The branches have 5 or 6 grooves along them.
Thickets in lowland and foothills, C. and S. Japan. Forests, grassy slopes and along the sides of streams; at elevations from 100-2,300 metres in China.
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It is a temperate plant. It grows on the edges of forests and along streams between 100-2,300 m above sea level in China. In Sichuan and Yunnan.
Can be grown by cuttings or seedlings. Seeds needs soaking.