USDA and NRCS Identifier NRCS Logo
USDA.gov Web Site PLANTS photo banner
PLANTS Home about PLANTS PLANTS Team Partners of PLANTS What's New at PLANTS National Plant Data Center Web Site Help using PLANTS Contact PLANTS
 
 Search the PLANTS Web site
 Name Search

PLANTS Topics
 
 
PLANTS Image Gallery
 
 
Download PLANTS data
 
 
Related tools
 
 
PLANTS Links
 
 
You are here: Home / PLANTS Profile Printer-Friendly Printer-Friendly / Plug-Ins
PLANTS Profile
Alabama Florida Georgia Hawaii Puerto Rico Virgin Islands Nunavut Greenland

 

Polygonum amphibium L.
water knotweed

       
Symbol:    
Group:    
Family:    
Duration:    
Growth Habit:    
Native Status:  
  
  
  
  



Click on the image below to enlarge it and download a high-resolution JPEG file.
Photo of Polygonum amphibium L.
Ray Schulenberg. USDA SCS. 1989. Midwest wetland flora: Field office illustrated guide to plant species. Midwest National Technical Center, Lincoln. Courtesy of USDA NRCS Wetland Science Institute. Usage Requirements.
 
More Information:
 

Images:
Polygonum amphibium L.

Click on a thumbnail to view an image, or see all the Polygonum thumbnails at the PLANTS Gallery
View a larger version of this image and Profile page for Polygonum amphibium L. View a larger version of this image and Profile page for Polygonum amphibium L. View a larger version of this image and Profile page for Polygonum amphibium L. View a larger version of this image and Profile page for Polygonum amphibium L. View a larger version of this image and Profile page for Polygonum amphibium L. View a larger version of this image and Profile page for Polygonum amphibium L. View a larger version of this image and Profile page for Polygonum amphibium L. View a larger version of this image and Profile page for Polygonum amphibium L. View a larger version of this image and Profile page for Polygonum amphibium L.
 

Distribution:
Polygonum amphibium L.

View Native Status
Distribution Map Legend

See U.S. county distributions (when available) by clicking on the map or the linked states below:

USA (AK, AR, AZ, CA, CO, CT, DC, DE, IA, ID, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NM, NV, NY, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VA, VT, WA, WI, WV, WY), CAN (AB, BC, LB, MB, NB, NF, NS, NT, ON, PE, QC, SK, YT), FRA (SPM)
 

Related Taxa:
Polygonum amphibium L.

View 33 genera in Polygonaceae, 80 species in Polygonum or click below on a thumbnail map or name for species profiles.
Distribution of Polygonum amphibium L. var. emersum Michx.. . Image Available.
Polygonum amphibium var. emersum
longroot smartweed
Distribution of Polygonum amphibium L. var. stipulaceum Coleman. . Image Available.
Polygonum amphibium var. stipulaceum
water smartweed
Plant is native (blue) Native   Plant is introduced Introduced
Related taxa legend
 

Classification:
Polygonum amphibium L.

Click on a scientific name below to expand it in the PLANTS Classification Report.
   
Kingdom Plantae – Plants
Subkingdom Tracheobionta – Vascular plants
Superdivision Spermatophyta – Seed plants
Division Magnoliophyta – Flowering plants
Class Magnoliopsida – Dicotyledons
Subclass Caryophyllidae
Order Polygonales
Family Polygonaceae – Buckwheat family
Genus Polygonum L. – knotweed
Species Polygonum amphibium L. – water knotweed
 

Noxious Weed Information:
Polygonum amphibium L.

The related entity italicized and indented above is listed by the U.S. federal government or a state. Common names are from state and federal lists. Click on a place name to get a complete noxious weed list for that location, or click here for a composite list of all Federal and State Noxious Weeds.

California:
Polygonum amphibium var. emersum
kelp              C list (noxious weeds)
 

U.S. Weed Information:
Polygonum amphibium L.

water knotweed

This plant can be weedy or invasive according to the authoritative sources noted below. This plant may be known by one or more common names in different places, and some are listed above. Click on an acronym to view each weed list, or click here for a composite list of Weeds of the U.S.

SWSS        Southern Weed Science Society. 1998. Weeds of the United States and Canada. CD-ROM. Southern Weed Science Society. Champaign, Illinois.
 

Wetland Indicator Status:
Polygonum amphibium L.

Nat. Ind. Reg. 1 Reg. 2 Reg. 3 Reg. 4 Reg. 5 Reg. 6 Reg. 7 Reg. 8 Reg. 9 Reg. 0 Reg. A Reg. C Reg. H
OBL OBL OBL OBL OBL OBL OBL OBL OBL OBL OBL OBL NO NO
Interpreting Wetland Indicator Status
 

Wildlife Habitat Values:
Polygonum amphibium L.

  Large Mammals Small Mammals Water Birds Terrestrial Birds
Source Large Mammals Food Large Mammals Cover Small Mammals Food Small Mammals Cover Water Birds Food Water Birds Cover Terrestrial Birds Food Terrestrial Birds Cover
Quinlan         Low   Low  
Wildlife Habitat Values

 

Quinlan, S.E., and S. Cuccarese. 2004. Native Alaskan and exotic plants used by wildlife(http://www.wildlife.alaska.gov/index.cfm?adfg=birds.plants, 4 April 2005). Alaska Department of Fish and Game, Anchorage.

 

More Accounts and Images:
Polygonum amphibium L.

View photographs from CalPhotos.

View species account from ARS Germplasm Resources Information Network (GRIN).

View taxonomic account from Integrated Taxonomic Information System (ITIS) for ITIS Taxonomic Serial Number 20865.

View species account and distribution map from Jepson Interchange (University of California - Berkeley).

View species account and photographs from Lady Bird Johnson Wildflower Center Native Plant Information Network (NPIN).

View species account from Native American Ethnobotany (University of Michigan - Dearborn).

View photographs and distribution from University of Tennessee Herbarium.

View species account, photographs, and distribution from University of Washington Burke Museum.

View species account and photographs from University of Wisconsin - Stevens Point Freckmann Herbarium.

 
 
Time Generated: 09/22/2008 11:17 AM MDT