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. 2013.
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WordNet
purple loosestrife

noun
marsh herb with a long spike of purple flowers; originally of Europe but now rampant in eastern United States 
WordNet® 3.0, © 2006 by Princeton University.
Cite This Source
00:10
Purple loosestrife is always a great word to know.
So is lollapalooza. Does it mean:
a stew of meat, vegetables, potatoes, etc.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Example sentences
When purple loosestrife invades a wetland, the species sometimes becomes more
  dominant than the original native wetland species.
Effects of clipping purple loosestrife seedlings during a simulated wetland
  drawdown.
How researchers are seeking ways to control the invasive purple loosestrife
  plant with insects.
Purple loosestrife is a stout, erect perennial herb with a strongly developed
  taproot and showy spikes of rose-purple flowers.
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