| Verbena
bonariensis
L. South American vervain, purpletop vervain Introduced |
                
|
| Verbena
bracteata
Lag. et Rodr. prostrate vervain Introduced |
           
|
| Verbena
hastata
L. blue vervain, common vervain Native |
                   
|
| Verbena
urticifolia
L. white vervain Native |
               
|