PLANTS Profile for Polygonum hydropiper (marshpepper knotweed)

Name Search
name search type enter a search name
	State Search
	Advanced Search
	Search Help


	Alternative Crops
	Characteristics
	Classification
	Cover Crops
	Culturally Significant
	Distribution Update
	Documentation
	Fact Sheets & Plant Guides
	Introduced, Invasive, and Noxious Plants
	Links
	Threatened & Endangered
	Wetland Indicator Status



	40,000+ Plant Images
	Submit Your Digital Images



	Complete PLANTS Checklist
	State PLANTS Checklist
	Advanced Search Download
	Symbols for Unknown Plants
	NRCS State GSAT Lists
	NRCS State Plants Lists



	Crop Nutrient Tool
	Ecological Site Information System
	PLANTS Identification Keys
	Plant Materials Web Site
	Plant Materials Publications
	USDA Plant Hardiness Map

Printer-Friendly / Plug-Ins

PLANTS Profile

Polygonum hydropiper L.
marshpepper knotweed

Symbol:

POHY

Group:

Dicot

Family:

Polygonaceae

Duration:

Annual

Growth Habit:

Forb/herb

Native Status:

L48		I
AK		I
HI		I
CAN		I
SPM		I

Click on the image below to enlarge it and download a high-resolution TIFF file.

Persicaria hydropiper

Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 1: 670. Courtesy of Kentucky Native Plant Society. Scanned by Omnitek Inc. Usage Requirements.

More Information:

Images:
Polygonum hydropiper L.

Click on a thumbnail to view an image, or see all the Polygonum thumbnails at the PLANTS Gallery

Synonyms:
Polygonum hydropiper L.

	PEHY6	Persicaria hydropiper (L.) Opiz
	POHYP	Polygonum hydropiper L. var. projectum Stanford

Distribution:
Polygonum hydropiper L.


View Native Status

See U.S. county distributions (when available) by clicking on the map or the linked states below:
USA (AK, AL, AR, CA, CO, CT, DC, DE, FL, GA, HI, IA, ID, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NV, NY, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VA, VT, WA, WI, WV, WY), CAN (BC, MB, NB, NF, NS, ON, PE, QC), FRA (SPM)

Related Taxa:
Polygonum hydropiper L.

View 33 genera in Polygonaceae, 80 species in Polygonum

Classification:
Polygonum hydropiper 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 hydropiper L. – marshpepper knotweed

Introduced Information:
Polygonum hydropiper L.

This plant is introduced to some part of the PLANTS Floristic Area, though it may be native in other parts. Click on link below for a partial or complete list of PFA introduced plants.

Scientific Name=	A \| B \| C \| D \| E \| F \| G \| H \| I \| J \| K \| L \| M \| N \| O \| P \| Q \| R \| S \| T \| U \| V \| W \| X \| Y \| Z \| all
Common Name=	A \| B \| C \| D \| E \| F \| G \| H \| I \| J \| K \| L \| M \| N \| O \| P \| Q \| R \| S \| T \| U \| V \| W \| X \| Y \| Z \| all

Wetland Indicator Status:

NOTE: On June 1, 2012, the 2012 National Wetland Plant List superseded the information below (see Federal Register, May 9, 2012, 77(90): 27210-27214[https://federalregister.gov/a/2012-11176]). For updated wetland information about this species, see the latest wetland list.

Polygonum hydropiper 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

FACW,OBL

OBL

FACW*

OBL

Interpreting Wetland Indicator Status

More Accounts and Images:
Polygonum hydropiper L.

View species account and distribution map from Flora of North America (FNA).

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

View taxonomic account from Integrated Taxonomic Information System (ITIS) for ITIS Taxonomic Serial Number 20856.

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

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

View photographs and distribution from University of Tennessee Herbarium.

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

Time Generated: 01/04/2013 03:20 AM CST