''Ludwigia decurrens'' is a species of flowering plant in the evening primrose family known by the common names willow primrose and wingleaf primrose-willow. It is native to the central and eastern United States.
This species is an annual or woody perennial herb growing up to 6 feet tall. It has an erect form and a winged stem. The linear leaves are alternately arranged. The flower has four to five yellow petals.
This plant grows in wet habitat types, often alongside ''Polygonum''.. more