E-Flora BC: Electronic Atlas of the Flora of British Columbia

Persicaria minor (Hudson) Opiz
Asian knotweed
Polygonaceae (Buckwheat family)

Introduction to Vascular Plants

Distribution of Persicaria minor
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Introduction

Asian knotweed is an introduced species of wet, muddy shorelines in British Columbia that originates in Europe. It is found in southwestern BC (Fraser Valley) and south-central BC.

Species Information

General:
Annual herb from a fibrous root; stems prostrate to ascending, several, simple or branched, 10-40 cm tall/long.

Leaves:
Basal leaves lacking; stem leaves alternate, linear to narrowly elliptic, the blades 3-10 cm long, 5-8 mm wide, the stalks short; stipules long coarse-hairy, the hairs extending about 1 mm beyond the tips.

Flowers:
Inflorescence of several flowers in spikelike racemes; perianths pink or purplish (rarely white), 1.5-3.5 mm long.

Fruits:
Achenes, 3-angled or lens-shaped, 2-2.5 mm long, black, smooth and shiny.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Wet, muddy shorelines in the lowland and steppe zones; infrequent in SW BC (lower Fraser Valley), rare in SC BC (Tranquille); introduced from Europe.

Source: The Illustrated Flora of British Columbia

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Status Information

Origin Status	Provincial Status	BC List (Red Blue List)	COSEWIC
Exotic	SNA	Exotic	Not Listed

BC Ministry of Environment: BC Species and Ecosystems Explorer, the authoritative source for conservation information in British Columbia.

Synonyms and Alternate Names

Polygonum minus Huds.

Taxonomic and Nomenclatural Links

Flora North America treatment for Polygonaceae
Flora North America treatment for Persicaria minor
Genetic information (NCBI Taxonomy Database)
International Plant Names Index
Taxonomic Information from the World Flora Online
Integrated Taxonomic Information System

Additional Range and Status Information Links

Burke Museum of Natural History (Washington State records)
CalFlora
Consortium of Pacific Northwest Herbaria records
Jepson Interchange
NatureServe Explorer

Additional Photo Sources

Images From CalPhoto
UT Austin's Native Plant Database
Google Image Search
Flickr Image Search

General References

Google Scholar Search
Family References
General Botanical References for BC

Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2020. E-Flora BC: Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for Advanced Spatial Analysis, Department of Geography, University of British Columbia, Vancouver. [Accessed: 2024-05-11 10:02:21 AM ]

Disclaimer: The information contained in the E-Flora atlas pages is derived from expert sources as cited in each section. This information is scientifically based. E-Flora also acts as a portal to other sites via deep links. As always, users should refer to the original sources for complete information. E-Flora BC is not responsible for the accuracy or completeness of the original information.