Vervain, the Common, or Simplers Joy, Verbena officinalis, L. an indigenous plant, grow-in waste places, on stone walls, and the sides of roads ; flowering in the months of August and September. - This plant is eaten by sheep, and its flowers are visited by bees. The roots impart a very agreeable taste to pickled cucumbers. - Among the ancients, the Simplers Joy was dedicated to Isis, the goddess of birth ; and, though at present exploded in medicine, Hoffman asserts, that the most inveterate and violent head-ach may be cured, by filling a bag with the leaves of Vervain, in a dry state, and applying it around the throat of the patient.