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Polygonum hydropiperoides Michx.
Gordon C. Tucker and Edwin H. Horning
U. S. A., New York, Suffolk
30-Jul-2001
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Polygonum hydropiperoides Michx.
Gordon C. Tucker and P. Lockwood
U. S. A., Rhode Island, Kent
10-Sep-2003
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Polygonum hydropiperoides var. hydropiperoides
Tad M. Zebryk
U. S. A., Massachusetts, Hampden
8/22/2002