Hydrangea arborescens, or wild hydrangea, is one of 70 species of hydrangea and is specific to the eastern United States. Also known as sheep flower and seven bark, the root system of the plant has been used for centuries to support urinary health. Of particular interest to scientists today is the coumarins found in hydrangea root, especially the anti-inflammatory potential of the glycosides skimmin, loganin and sweroside. Hydrangea root powder is quite versatile, with culinary, cosmetic and wellness applications.