|purple loosestrife (Lythrum salicaria)||
purple loosestrife (Lythrum salicaria; LOOSESTRIFE FAMILY [Lythraceae]) Tall, stout perennial wetland herb with long showy purple-magenta flower spikes in late summer. Leaves opposite or in whorls of 3, stalkless, lance-shaped. Flowers 5-7 parted, ½” wide, aggregated into long terminal spikes. Often grows in dense stands from woody taproots and dense mats of fibrous rhizomes. Introduced as a garden flower, it has escaped and reproduced prolifically throughout most of temperate North America. It is illegal to sell, distribute, or cultivate purple loosestrife in Wisconsin and several other states. 
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