Giant Knotweed Reynoutria sachalinense (F. Schmidt ex Maximowicz) NakaiNon-native  -  Invasive    Synonyms: Fallopia sachalinensis, Polygonum sachalinensis, Reynoutria sachalinensis.
Kingdom Plantae   >   Division Tracheophyta   >   Class Magnoliopsida   >   Order Caryophyllales   >   Family Polygonaceae   >   Genus Reynoutria   

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Giant Knotweed in Howard Co., Maryland (6/18/2010). Note cordate leaf bases. Photo by Bill Harms. (MBP list)

Giant Knotweed in Calvert Co., Maryland (4/18/2020). Photo by Ben Springer. (MBP list)

Giant Knotweed in Calvert Co., Maryland (4/18/2020). Photo by Ben Springer. (MBP list)

Giant Knotweed in Howard Co., Maryland (4/19/2017). Photo by Bill Harms. (MBP list)

Giant Knotweed in Howard Co., Maryland (8/25/2015). Photo by Wesley Knapp. (MBP list)

Giant Knotweed in Howard Co., Maryland (4/10/2016). Photo by Timothy Reichard. (MBP list)

Giant Knotweed in Baltimore Co., Maryland (4/27/2020). (c) courant, some rights reserved (CC BY-NC). Photo by courant via iNaturalist. (MBP list)

Giant Knotweed in Baltimore Co., Maryland (5/14/2016). Verified by Wes Knapp. Photo by Bill Hubick. (MBP list)

Young growth of Giant Knotweed in Howard Co., Maryland (4/10/2016). Photo by Timothy Reichard. (MBP list)

Giant Knotweed in Baltimore Co., Maryland (5/7/2017). Photo by Bill Harms. (MBP list)

Giant Knotweed in Howard Co., Maryland (6/2/2017). Photo by Bill Harms. (MBP list)


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MBP marks as "Invasive" any taxon listed in the Maryland Invasive Species Council (MISC) list of Invasive Species of Concern in Maryland. You can read their criteria and review the lists here: https://mdinvasives.org/species-of-concern/.