Plants Profile for Polygonum polystachyum (cultivated knotweed)

General Information
Symbol:	POPO5
Group:	Dicot
Family:	Polygonaceae
Duration:	Perennial
Growth Habit:	Forb/herb
Native Status:	CAN I L48 I SPM I
Data Source and Documentation

	Native		Introduced		Both		Absent/Unreported
	Native, No County Data		Introduced, No County Data		Both, No County Data

L48

NAV

CAN

SPM

Images

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Synonyms

Symbol	Scientific Name	Other Common Names
ACPO7	Aconogonum polystachyum (Wall. ex Meisn.) H. Haraldson
PEWA18	Persicaria wallichii Greuter & Burdet	Garden Smartweed

Classification

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 polystachyum Wall. ex Meisn. – cultivated knotweed

Subordinate Taxa

This plant has no children

Legal Status

Noxious Weed 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 noxious weed list for that location, or click here for a composite list of all Federal and State Noxious Weeds.
California Himalayan knotweed B list (noxious weeds)
Oregon Himalayan knotweed "B" designated weed Himalayan knotweed Quarantine
Washington Himalayan knotweed Class B noxious weed Himalayan knotweed Noxious weed seed and plant quarantine

U.S. Weed Information
Polygonum polystachyum Himalyan 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.
STATE	Assorted authors. State noxious weed lists for 46 states. State agriculture or natural resource departments.

Wetland Status

Interpreting Wetland Status

Synonyms

PEWA18 Persicaria wallichii Greuter & Burdet

North America
Arid West	FAC
Eastern Mountains and Piedmont	FAC
Northcentral & Northeast	FAC
Western Mountains, Valleys, and Coast	FAC