VERVAIN

[ver.vain] n [ME verveine, fr. MF, fr. L verbena leafy branch; akin to L verber rod, Lith virbas, and perh. to Gk rhabdos rod] (14c): any of a genus (Verbena of the family Verbenaceae, the vervain family) of chiefly American plants that have bracted spicate flowers, a regular corolla with a 5-lobed limb, and a fruit that separates into four nutlets