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alligator weed

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alligator weed  
n.  An aquatic South American perennial plant (Alternanthera philoxeroides) having opposite, lance-shaped leaves and tight clusters of small whitish flowers. It is a mat-forming weed in warm, freshwater habitats, such as the southeast United States.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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alligator weed

noun
prolific South American aquatic weed having grasslike leaves and short spikes of white flowers; clogs waterways with dense floating masses 
WordNet® 3.0, © 2006 by Princeton University.
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