Utah Valley University Herbarium


Accession # 11280 
Family - UVUAPG III FamilyCronquist FamilyA Utah Flora
Species Polygonum amphibium L.
Common name   water knotweed
J.G. Harris   3501  
   with M.W. Harris
Coll. Date 30 August 2003 
United States
Sanpete County
Locality Palisade Lake.
     Elev.: 5871 ft. (1790 m.)
Habitat Notes aquatic community. 
Climate NCDC temperatures, daily high (red), daily average (green) and daily low (blue), from 1970 to 2000 at this location.   NCDC average monthly precipitation from 1970 to 2000 at this location.
Latitude Longitude 39° 12'  19" N, 111° 40'  2" W
Datum Not recorded
Uncertainty Not calculated


Synonyms recognized by ITIS (bold taxon is currently accepted):

     Polygonum amphibium L.

Common Name(s): water knotweed, water smartweed.

Taxonomic Hierarchy: (ITIS TSN=20865, click for more information and references)

        Kingdom: Plantae
            Subkingdom: Tracheobionta
                Division: Magnoliophyta
                    Class: Magnoliopsida
                        Subclass: Caryophyllidae
                            Order: Polygonales
                                Family: Polygonaceae
                                    Genus: Polygonum
                                        Species: Polygonum amphibium


Available images of this specimen (click to view):
specimen image: 11280s1.jpg

Images of other samples of the same species:
specimen image: 07057s1.jpg 
specimen image: 08833s3.jpg 
specimen image: 13381s1.jpg 

Nearby Accessions

Other accessions in the database collected near this one:

Accession Name Dist., dir.
06908 Castilleja exilis     2425 ft. SE
07059 Cichorium intybus      "chicory" 2524 ft. W
06911 Eleocharis acicularis      "needle spikerush" 2425 ft. SE
06910 Machaeranthera canescens      "gray tansy aster" 2425 ft. SE
07056 Mentha arvensis      "wild mint" 2524 ft. W
07057 Polygonum amphibium      "water knotweed" 2524 ft. W
06903 Potamogeton pectinatus     2425 ft. SE
06905 Ranunculus aquatilis  var. diffusus  2425 ft. SE
06907 Sagittaria cuneata      "northern arrowhead" 2425 ft. SE
07058 Symphyotrichum spathulatum      "western mountain aster" 2524 ft. W
07060 Xanthium strumarium  var. canadense   "Canada cocklebur" 2524 ft. W


Nearby locations from the USGS Geographic Name Information System (GNIS) database:

Name County Dist., dir. Elevation (ft.) 7.5' Quad Name
Palisade State Boating Park (Park) Sanpete County, UT 630 ft. NE 5922  Sterling 
Sixmile Canyon (Valley) Sanpete County, UT 1707 ft. S   Black Mountain 
Palisade Lake (Reservoir) Sanpete County, UT 1636 ft. SW 5873  Sterling 
Palisade Lake Dam (Dam) Sanpete County, UT 1636 ft. SW 5873  Sterling 
Funk Canyon (Valley) Sanpete County, UT 2394 ft. S   Black Mountain 
Palisade Campground (Locale) Sanpete County, UT 0.6 mi. E 5958  Sterling 
Morrison Mine (Mine) Sanpete County, UT 0.8 mi. E 6270  Sterling 
Snows Canyon (Valley) Sanpete County, UT 1.1 mi. SW   Black Mountain 
Lake Canal (Canal) Sanpete County, UT 1.5 mi. N 5663  Sterling 
Six-Mile Wildlife Management Area (Park) Sanpete County, UT 1.8 mi. S 6555  Sterling 
Sterling (Populated Place) Sanpete County, UT 1.6 mi. SW 5578  Sterling 
The Church of Jesus Christ of Latter Day Saints (Church) Sanpete County, UT 1.6 mi. SW 5571  Sterling 
Manti Dump Wildlife Management Area (Park) Sanpete County, UT 1.8 mi. NE 6405  Sterling 
Sanpete Valley (Valley) Sanpete County, UT 2.1 mi. N   Fairview 
Danish Field Creek (Stream) Sanpete County, UT 2.1 mi. N   Manti 
Sterling Cemetery (Cemetery) Sanpete County, UT 1.8 mi. W 5535  Sterling 
Forbush Cove (Basin) Sanpete County, UT 1.9 mi. SE 7468  Sterling 
Manti Meadows Waterfowl Management Area (Park) Sanpete County, UT 2.7 mi. N 5453  Sterling 
Gunnison Reservoir (Reservoir) Sanpete County, UT 2.3 mi. W 5384  Sterling 
Rattlesnake Peak (Summit) Sanpete County, UT 2.4 mi. E 8544  Black Mountain 


Taxon Links for species Polygonum amphibium  L.

CalPhotos, Berkeley Digital Library Project

CNPS Manual of California Vegetation Database

USDA Plants database
University of Washington Herbarium: Plants of Washington (images)

Texas A&M University: Image Library (images)

Lady Bird Johnson's Wildflower Center

Google Images

External link to this species in the UVU Herbarium:

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