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A perennial plant (Lythrum salicaria) native to Eurasia, having long spikes of purple flowers. It is naturalized in North America and often forms dense stands in wetlands.
an Old World wetland plant, Lythrumsalicaria, of the loosestrife family, having spikes of reddish purple flowers.
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|Noun||1.||purple loosestrife - marsh herb with a long spike of purple flowers; originally of Europe but now rampant in eastern United States|
loosestrife - any of numerous herbs and subshrubs of the genus Lythrum