North America, Europe, Africa, Asia, Australia
Species commonly cultivated
Lythrum alatum Pursh. (North and South America)
L. salicaria L. (Eurasia, North America)
L. virgatum L. (Asia, Europe)
Lythrum salicaria is introduced into North America.
Purple loosestrife (Lythrum salicaria) is a declared noxious weed in many countries, including many states in the United States.
small herb to medium sized shrub, emergent
Stem erect, creeping or floating. Leaves opposite, whorled or alternate, usually sessile; leaf blade linear to ovate or obovate; base acute, obtuse to cordate. Flowers actinomorphic or slightly zygomorphic, solitary in leaf axils or in complex inflorescences, usually a terminal spike. Sepal tube campanulate to tubular, lobes 6 (4); petals usually 6 (4), pink to purple. Propagules are seeds.