Common name(s): Blue vervain
Category: Genus Verbena
Verbena simplex
Common name(s): Narrowleaf vervain
Verbena urticifolia
Common name(s): White vervain
Wildflowers of the National Capital Region
Discovering wildflowers in Maryland, Washington D.C., and Northern Virginia
Common name(s): Blue vervain
Common name(s): Narrowleaf vervain
Common name(s): White vervain