Water Knotweed Persicaria amphibia (Linnaeus) S.F. Gray  Synonyms: Persicaria amphibia var. emersa, Persicaria meuhlenbergii, Polygonum amphibium, Polygonum coccineum.
Water Knotweed blooming in Montgomery Co., Maryland (8/14/2017). Photo by Elizabeth Miller. (MBP list)

Water Knotweed in Montgomery Co., Maryland (8/2/2014). Photo by Jim Stasz. (MBP list)

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