Lianas. Stem angulate. Branchlets tomentose or villous. Leaves 3-foliolate; petiole 4-10 cm, sparsely pubescent, tomentose, or villous; leaflets: petiolules 0.3-1.5 cm, densely golden brown tomentose; blade ovate to obovate-elliptic or ovate-elliptic, 6-11(-16) × (2-)3-7(-9) cm, papery, lateral veins ca. 4-paired, conspicuous on both surfaces, veinlets scalariform, conspicuous abaxially, base subrounded or subcordate, apex obtuse or shortly acuminate. Cymose panicles axillary, longer than petioles, narrow, densely golden brown tomentose. Flowers red. Outer tepals purple-red, oblong, 8-10 mm, abaxially sparsely pubescent. Inner tepals similar to outer ones but slightly shorter, rose. Stamens 6-9 mm, pubescent; filaments straight in bud, 5-7 mm; appendages on ca. 1 mm stipe, ca. 2.5 mm total, membranous, abaxially with open mouth, apex dentate. Ovary densely brown pubescent; style 5-6 mm, yellow tomentose. Interstaminal glands small. Fruit 4-winged; large wings ligulate or suborbicular, 2.5-3.5 cm wide, smaller ones 0.5-1 cm wide. Fl. (Jun-)Sep-Nov, fr. Dec-Apr or May of following year.

Valley forests, thickets, mountain slopes; 100-600(-2100) m. Guangdong, Guangxi, Guizhou, Hainan, Yunnan [Cambodia, Laos, Thailand, Vietnam].