narrow-leaf vervain
- kingdom: Plantae
- phylum: Tracheophyta
- class: Magnoliopsida
- order: Lamiales
- family: Verbenaceae
- genus: Verbena
- species: Verbena simplex
Steele
Alabama- Heritage Village
- Kent
- Montville Center
- New Haven
- Orange
- Southbury
Connecticut- Gary
Indiana- Brookmont
- Cabin John
- Chillum
- Takoma Park
Maryland- Fort Belvoir
- Purcellville
Virginia- Washington, D. C.
Washington, D.C.
United States