Winged LoosestrifeThe inflorescence consists of a tall narrow spike up to 1½' long. One or two flowers develop from individual axils of small leafy bracts, which are crowded together along the spike. Each flower is about ½" across or slightly larger, and its corolla is pale lavender to purple. The corolla has six narrow lobes that spread outward from a tubular calyx; each lobe has a fine line of dark purple that leads to the throat of the flower. The calyx is light green to purplish green with 6 lanceolate teeth. Reproductive organs consist of 6 stamens and a pistil with a single style; the style may, or may not, be exerted. The blooming period occurs from mid- to late summer, and lasts about 1-2 months. There is no noticeable floral scent. The root system is rhizomatous. The tiny seeds can be carried a considerable distance by wind or water.
