Vines woody. Stems 4--5 m; branches shallowly 10--14-grooved, glabrescent. Leaves simple; petiole 6--11 cm; leaf blade ovate-orbicular, cordate, or ovate, 10--17 × 9--14.5 cm, subleathery, both surfaces glabrous and conspicuously reticulate, base broadly cuneate, rounded, or subcordate, margin entire, apex acuminate; basal veins 5--7, prominent. Cymes paniculate; peduncle densely reddish brown puberulous; bracts subulate, ca. 5 mm. Flowers ca. 4.5 cm in diam. Pedicel 2--3 cm, densely reddish brown puberulous. Sepals 6, spreading to revolute, oblanceolate-linear, ca. 2.4 × 0.5 cm, abaxially reddish brown velutinous, adaxially brown velutinous, apex obtuse. Stamens 0.9--1.4 cm, glabrous; anthers narrowly oblong, 2--3 mm, apex with a ligulate ca. 1.5 mm apicula. Ovaries pubescent. Style ca. 6 mm, densely villous. Achenes rhombic-elliptic, 6--7 × ca. 3 mm, pubescent; persistent style 4--5 cm, yellowish plumose. Fl. Oct--Dec, fr. Jan--Feb.

Forests, scrub, along streams; 1000--1600 m. S Yunnan [India, Laos, Myanmar, N Thailand, Vietnam].