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.

Source: Webster's Revised Unabridged Dictionary (1913)