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From The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster] Note: Verbena, or vervain, was used by the Greeks, the Romans, and the Druids, in their sacred rites. --Brewer. [1913 Webster] 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. [1913 Webster]