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Any herbaceous plant in the genus Verbena especially if used for medicinal purposes, primarily Verbena officinalis, common in Europe and formerly held to have medicinal properties.

Common vervain, Verbena officinalis

Any herbaceous plant in the genus Verbena especially if used for medicinal purposes, primarily Verbena officinalis, common in Europe and formerly held to have medicinal properties.

Botanical illustration of common vervain (V. officinalis) from Deutschlands Flora in Abbildungen by Johann Georg Sturm and Jacob Sturm, 1796

Any herbaceous plant in the genus Verbena especially if used for medicinal purposes, primarily Verbena officinalis, common in Europe and formerly held to have medicinal properties.

Purpletop vervain (V. bonariensis) as an ornamental plant