\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.