Description from Flora of China
Vines woody. Stem terete. Leaves pinnately compound, margin entire, apex obtuse; basal 2 leaflets developed normally, apical 3 leaflets developed into tendrils. Inflorescences paniculate, terminal or axillary; bractlets 2. Pedicel 1--1.5 cm, basally pilose. Flowers spreading. Sepals 4. Petals 8--12, narrow, linear to clavate. Stamens numerous. Pistils hairy; ovule 1 per ovary, pendulous. Styles persistent, plumose. Achenes slender, shortly stipitate.
About nine species: S and SE Asia; two species (one endemic) in China.
(Authors: Fu Dezhi; Orbélia R. Robinson)