Marshpepper Knotweed Persicaria hydropiper (Linnaeus) OpizNon-native  Synonyms: Polygonum hydropiper.
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Marshpepper Knotweed in Anne Arundel Co., Maryland (8/27/2012). Photo by Bill Harms. (MBP list)

Marshpepper Knotweed in Anne Arundel Co., Maryland (9/26/2011). Photo by Bill Harms. (MBP list)

Marshpepper Knotweed blooming in Baltimore City, Maryland (9/10/2017). Photo by Kirsten Johnson. (MBP list)


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