Narrow-leaved Primrose-willow (Ludwigia linearis)
Genus Ludwigia / Family Onagraceae / Order Myrtales / Class Magnoliopsida / Phylum Tracheophyta / Kingdom Plantae
Narrow-leaved Primrose-willow in Wicomico Co., Maryland (9/2/2017).

Narrow-leaved Primrose-willow in Dorchester Co., Maryland (9/2/2017). Identified by Jim Brighton.
Narrow-leaved Primrose-willow (Ludwigia linearis)
Genus Ludwigia / Family Onagraceae / Order Myrtales / Class Magnoliopsida / Phylum Tracheophyta / Kingdom PlantaeTotal Records: 2
Narrow-leaved Primrose-willow (Ludwigia linearis) - Map
For now, here's a fun heat map representation of my personal sightings in iNaturalist courtesy of iNaturalist.