Selected Images

14 Images Send these Selected Images to Your Light Box

1551143 water knotweed Polygonum amphibium Plant(s) Catherine Herms	1559198 water knotweed Polygonum amphibium Plant(s) Ohio State Weed Lab Archive	1559213 water knotweed Polygonum amphibium Infestation Ohio State Weed Lab Archive	1551145 water knotweed Polygonum amphibium Foliage Catherine Herms
1559223 water knotweed Polygonum amphibium Feature(s) Catherine Herms	1559222 water knotweed Polygonum amphibium Feature(s) Catherine Herms	1559225 water knotweed Polygonum amphibium Stem(s) Ohio State Weed Lab Archive	1559216 water knotweed Polygonum amphibium Infestation Ohio State Weed Lab Archive
1559194 water knotweed Polygonum amphibium Flower(s) Ohio State Weed Lab Archive	1559196 water knotweed Polygonum amphibium Plant(s) Catherine Herms	1559206 water knotweed Polygonum amphibium Plant(s) Catherine Herms	1559197 water knotweed Polygonum amphibium Plant(s) Ohio State Weed Lab Archive
1559227 water knotweed Polygonum amphibium Root(s) Ohio State Weed Lab Archive	1559205 water knotweed Polygonum amphibium Seed(s) Ken Chamberlain

Maps

EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit www.eddmaps.org

Alternative content

State Regulated List - This map identifies those states that list this species on their regulated list. For more information, visit Invasive.org

Alternative content

Invasive Listing Sources

California Noxious Weeds

Taxonomic Rank

Kingdom: Plantae

Phylum: Magnoliophyta

Class: Magnoliopsida

Subclass: Caryophyllidae

Order: Polygonales

Family: Polygonaceae

Genus: Polygonum

Synonyms and Other Names

Other Common Names:
water smartweed

References

Common Name Reference:	USDA, NRCS. 2010. The PLANTS Database. National Plant Data Center, Baton Rouge, LA, USA.
Scientific Name Reference:	USDA, NRCS. 2010. The PLANTS Database. National Plant Data Center, Baton Rouge, LA, USA.