This is a very common plant and yet a very useful one. The flowers and leaves are the parts used in medicine. They should be gathered in July and August.

Medical properties and uses. -- The tea made from this plant is a very valuable remedy for breaking up colds. In large doses it will cause vomiting and stimulate the liver. In the form of a cold tea, in small doses, it acts as a tonic. Dose, of the hot tea, two or three ounces; of the cold tea, a tablespoonful every three or four hours.