Close-up Beautiful Purple Verbena In The Field. Stock Image

Verbena bonariensis purpletop vervain, clustertop vervain, Argentinian vervain,tall verbena, or pretty verbena is a member of the verbena family cultivated as a flowering annual or herbaceous perennial plant. In USA horticulture, it is also known by the ambiguous names `purpletop` also used for the grass Tridens flavus and `South American vervain` which can mean any of the numerous species in the genus Verbena occurring in that continent.