purple loosestrife

noun
an Old World plant, Lythrum salicaria, of the loosestrife family, widely naturalized in North America, growing in wet places and having spikes of reddish-purple flowers.

Origin:
1540–50

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Purple loosestrife is a stout, erect perennial herb with a strongly developed
  taproot and showy spikes of rose-purple flowers.
Effects of clipping purple loosestrife seedlings during a simulated wetland
  drawdown.
Raise special purple loosestrife eating beetles to control the invader.
How researchers are seeking ways to control the invasive purple loosestrife
  plant with insects.
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