Source : Webster's Revised Unabridged Dictionary (1913)

Verbena \Ver*be"na\, n. [L. See {Vervain}.] (Bot.)
   A genus of herbaceous plants of which several species are
   extensively cultivated for the great beauty of their flowers;
   vervain.

   Note: Verbena, or vervain, was used by the Greeks, the
         Romans, and the Druids, in their sacred rites.
         --Brewer.

   {Essence of verbena}, {Oil of verbena}, a perfume prepared
      from the lemon verbena; also, a similar perfume properly
      called {grass oil}. See {Grass oil}, under {Grass}.

   {Lemon}, or {Sweet}, {verbena}, a shrubby verbenaceous plant
      ({Lippia citriodora}), with narrow leaves which exhale a
      pleasant, lemonlike fragrance when crushed.

Source : WordNet®

verbena
     n : any of numerous tropical or subtropical American plants of
         the genus Verbena grown for their showy spikes of
         variously colored flowers [syn: {vervain}]