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Polygonum hydropiperoides Michx.
swamp smartweed

General Information
Symbol: POHY2
Group: Dicot
Family: Polygonaceae
Duration: Perennial
Growth Habit: Forb/herb
Native Status: AK   I
PR   N
L48   N
Data Source and Documentation
Plants-NRCS Logos
green round image for nativity Native blue round image for introduced Introduced ocre round image for introduced and nativity Both white round image for no status Absent/Unreported
image for native, but no county data Native, No County Data image for introduced, but no county data Introduced, No County Data both introduced and native, but no county data Both, No County Data
Native Status:
lower 48 status L48    Alaska status AK    Hawaii status HI    Puerto Rico status PR    Virgin Islands status VI    Canada status CAN    Greenland status GL    Saint Pierre and Michelon status SPM   


Symbol Scientific Name
PEHYO Persicaria hydropiperoides (Michx.) Small var. opelousana (Riddell ex Small) J.S. Wilson
POHYP2 Polygonum hydropiperoides Michx. var. psilostachyum H. St. John
PEOP3 Persicaria opelousana (Riddell ex Small) Small
POOP2 Polygonum opelousanum Riddell ex Small
POHYO Polygonum hydropiperoides Michx. var. opelousanum (Riddell ex Small) Riddell ex W. Stone
POHYS Polygonum hydropiperoides Michx. var. strigosum (Small) Stanford
POHYA2 Polygonum hydropiperoides Michx. var. asperifolium Stanford
PEPA42 Persicaria paludicola Small
PEHYE Persicaria hydropiperoides (Michx.) Small var. euronotora (Fernald) C.F. Reed
PEHYB Persicaria hydropiperoides (Michx.) Small var. breviciliata (Fernald) C.F. Reed
POHYD Polygonum hydropiperoides Michx. var. digitatum Fernald
PEHY7 Persicaria hydropiperoides (Michx.) Small
POHYE Polygonum hydropiperoides Michx. var. euronotorum Fernald
POHYB Polygonum hydropiperoides Michx. var. breviciliatum Fernald
PEPE28 Persicaria persicarioides (Kunth) Small
POPE20 Polygonum persicarioides Kunth
POHYB2 Polygonum hydropiperoides Michx. var. bushianum Stanford
POOPA Polygonum opelousanum Riddell ex Small var. adenocalyx Stanford
POHYA Polygonum hydropiperoides Michx. var. adenocalyx (Stanford) Gleason


Click on a scientific name below to expand it in the PLANTS Classification Report.
Rank Scientific Name and Common Name
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 hydropiperoides Michx. – swamp smartweed

Subordinate Taxa

This plant has no children

Legal Status

Threatened and Endangered Information:
This plant 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 protected plant list for that location.
Polygonum hydropiperoides var. opelousanum
northeastern smartweed
New York
Polygonum hydropiperoides var. opelousanum
Opelousa smartweed

Wetland Status

Interpreting Wetland Status


PEHY7  Persicaria hydropiperoides (Michx.) Small

Top Level Regions
Alaska OBL
Arid West OBL
Atlantic and Gulf Coastal Plain OBL
Caribbean OBL
Eastern Mountains and Piedmont OBL
Great Plains OBL
Midwest OBL
Northcentral & Northeast OBL
Western Mountains, Valleys, and Coast OBL



Source Large Mammals Small Mammals Water Birds Terrestrial Birds


Source Large Mammals Small Mammals Water Birds Terrestrial Birds

Description of Values

Value Class Food Cover