Pennyroyal, or Mentha Pulegium, L. an indigenous plant) growing on moist heaths and pastures ; flowering in the mouths of August and September.—This herb possesses properties similar to those, of the mint; but it is more acrid, and less agreeable to the palate. It-has long been esteemed as an aperient and deobstruent, particularly in hysteric and other female complaints. Hence, the distilled water is generally preferred; though an infusion of the leaves would answer the purpose, without giving an opportunity for tippling.—Dr. Withering observes, that the expressed juice of peunyroyal, with a little sugar, is an useful medicine in the hooping-cough.