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Polygonum engelmannii Greene  
Family: Polygonaceae
Engelmann's knotweed, more...Engelmann's knotweed
[Polygonum douglasii ssp. engelmannii (Greene) Kartesz & Gandhi, morePolygonum douglasii var. microspermum (Engelm.) Dorn, Polygonum tenue var. microspermum Engelm.]
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