Winged Loosestrife

There was a lot of the native, 'purple' loosestrife (Lythrum alatum) in a wetland in Henry County, Indiana. This flower looks superficially similar to a small purple loosestrife (Lythrum salicaria), but has six petals instead of five, solitary flowers in each axil, winged stems, and leaves less than five centimeters. Needless to say, the native loosestrife is not aggressive and invasive in wetlands.