Ver·be·na n.  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.
 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 verbena, or Sweet verbena, a shrubby verbenaceous plant (Lippia citriodora), with narrow leaves which exhale a pleasant, lemonlike fragrance when crushed.

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