perennial woodland native of North America having a red root and red sap and bearing a solitary lobed leaf and white flower in early spring and having acrid emetic properties; rootstock used as a stimulant and expectorant
Any of several plants with red roots, such as the New Jersey tea (Ceanothus americanus), the gromwell (Lithospermum arvense), the bloodroot (Sanguinaria canadensis), and Lachnanthes caroliniana (syn. Lachnanthes tinctoria).