This is one of around 200 species of Oenothera in North and South America, and most are native to the Western Hemisphere.
Most Oenothera species are annual plants that grow in moist to semi-aquatic habitats, although some do well in landscape, as well as drier waste areas and roadsides. Reproduction is from seeds.
Mature plants may grow to 2 feet tall or more, with branching off of the main stem and an erect, ascending growth of all the stems. Leaves are linear and over an inch long, without basal stalks, and usually stems and leaves are hairless or nearly so.
Flowers are bright yellow with four petals, turning more orange as they mature.
Characteristicts Important to Control:
Physical removal is effective for individual plants, and control of excessive moisture will reduce the growth potential of many of the species.