Description from Flora of China
Trees, deciduous. Leaves alternate; stipules absent; leaf blade margin serrate. Inflorescences terminal or axillary, racemes or panicles; bracteoles small. Pedicel jointed. Flowers bisexual. Calyx tube cup-shaped, 5-toothed. Corolla campanulate; lobes 5, imbricate. Stamens 10, 5 long and 5 short; filaments broad and flattened, mostly connate into a broad tube and adnate to corolla; anthers oblong. Ovary superior, 5-locular; ovules 8--10 per locule, 2 series in central axis. Style linear, slender; stigma obscurely 5-lobed. Fruit capsular, loculicidally dehiscent into 5 valves, exocarp slightly fleshy. Seeds with irregularly membranous wings at each end; embryo straight.
Three species: SE Asia, S China; three species in China.