Purpletop vervain

Verbena bonariensis

''Verbena bonariensis'' 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" and "South American vervain" . For the misapplication "Brazilian verbena" see below.

It is native to tropical South America where it grows throughout most of the warm regions, from Colombia and Brazil to Argentina and Chile.