According to Hale Verbena h. grows profusely on the prairies and low bottom lands all over U.S. It is a popular domestic remedy for ague, especially when chronic.
The root is intensely and disagreeably bitter. Dr. Griffin, of New York, suggests its use as a remedy for Rhus poisoning.
Richey Horner (Med. Cent., vi. 324) mentions a case of epilepsy developing during whooping-cough, treated with 12-drop doses (“presumably of the tincture”) every four hours. Improvement set in from the first and proved permanent; though during the first two weeks there were attacks of petit mal. The patient took the remedy at increasing intervals during six weeks.
Reference: The Dictionary of Practical Materia Medica. J. H. Clarke