Decumaria, the woodvamps, is a genus of two species of flowering plants in the family Hydrangeaceae, one (D. barbara) native to the southeastern United States, and the other (D. sinensis) native to central China.
They are shrubby lianas growing to 4âÂÂ10 m high through shrubs and trees, climbing by means of aerial adhesive rootlets. The leaves are variably deciduous to evergreen (with D. barbara tending to be more often deciduous, D. sinensis more evergreen), 3âÂÂ10 cm long, ovate with an acute apex, and a smooth to obscurely toothed margin. The flowers are 5âÂÂ10 mm diameter, white to creamy colored, fragrant, produced in dense panicles 3âÂÂ8 cm broad. The fruit is a dry capsule containing several seeds.