Source : Webster's Revised Unabridged Dictionary (1913)

Vervain \Ver"vain\, n. [OE. verveine, F. verveine, fr. L.
   verbena, pl. verbenae sacred boughs of laurel, olive, or
   myrtle, a class of plants; cf. verbenaca vervain. Cf.
   {Verbena}.] (Bot.)
   Any plant of the genus Verbena.

   {Vervain mallow} (Bot.), a species of mallow ({Malva Alcea})
      with rose-colored flowers.