Vines woody. Branches shallowly 10-grooved, appressed puberulous. Leaves ternte; petiole 6--10 cm; leaflet blade ovate or triangular-ovate, 6--11 × 3.4--6 cm, subleathery or papery, abaxially sparsely pubescent on basal veins and veinlets, adaxially sparsely puberulous on basal veins, base rounded or truncate-rounded, margin entire, apex acute or attenuate; basal veins abaxially slightly prominent. Cymes axillary, paniclelike, many flowered; peduncle 0.7--9.5 cm, sparsely puberulous; bracts petiolate, narrowly elliptic, 0.7--2.5 cm. Flowers 1.3--2.4 cm in diam.; pedicel 0.6--2.6 cm, densely puberulous. Sepals 4, white, spreading, narrowly oblong, 6.5--14 × 3--5 mm, abaxially densely appressed puberulous, adaxially glabrous, margin sometimes velutinous. Stamens 5--9 mm, glabrous; anthers oblong or narrowly so, 1.2--1.8 mm, apex obtuse. Ovaries densely puberulous; style ca. 5 mm, densely villous. Achenes compressed, broadly elliptic, ca. 5 × 4 mm, densely appressed pubescent; persistent style ca. 3.5 cm, yellow plumose. Fl. Aug--Dec.

Forests; 900--1700 m. SW Yunnan [Myanmar, N Thailand].