Winged Loosestrife (Lythrum Alatum) is a non–aggressive species of Lythrum.  It should not be confused with the extremely invasive Lythrum salicaria (purple loosestrife).
Bushy form bearing multitudes of 1/2" rosy–lavender flowers.  Foliage turns orange–red in late summer and early autumn.  Grows best is moist soil. Good for planting in areas of poor drainage.