Xanthorhiza simplicissima Marshall Ranunculaceae. Yellow root. Distribution: North America, where it was discovered by the plant collector and explorer William Bartram in 1773. Austin (2004) reports that of the Native Americans, the Cherokee use the crushed plant to make a yellow dye

a decoction of the root cramps, blood tonic, to treat cancer, piles, sore eyes and for a sore throat The Catawba use it for colds, stomach ulcers, jaundice. The root is poisonous if 'too much' is taken. It was used as a 'bitters' in American drinks in the early 20th century. Photographed in the Medicinal Garden of the Royal College of Physicians, London.