vervain
ver.vain \'v*r-.va-n\ n [ME verveine, fr. MF, fr. L verbena, sing. of verbenae sacred] boughs, certain medicinal plants; akin to L verber rod, Gk rhabdos : any of a genus (Verbena of the family Verbenaceae, the vervain fam ily) of plants; esp : one with small spicate flowers