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

Persicaria nepalensis (Meisn.) Miyabe
Nepalese knotweed
Polygonaceae (Buckwheat family)

Introduction to Vascular Plants

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Distribution of Persicaria nepalensis
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Species Information

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Illustration Source: The Illustrated Flora of British Columbia

General:
Annual herb from a fibrous root; stems decumbent, several, branched, 30-60 cm long.

Leaves:
Basal leaves lacking; stem leaves alternate, widely lanceolate to wedge-shaped, the blades 0.5-7 cm long, the stalks short, winged; stipules smooth, 2-6 mm long, fringed at the tips.

Flowers:
Inflorescence of several flowers in crowded, globe- or head-shaped axillary or terminal panicles; perianths green with pinkish margins, 2-2.5 mm long.

Fruits:
Achenes, 3-angled or lens-shaped, 1.5-2 mm long, roundish, black, pimply, shiny.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Mesic to dry disturbed sites and gravel bars in the lowland zone; locally frequent in SW BC (Vancouver area); recently introduced from Asia.

Source: The Illustrated Flora of British Columbia

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

Persicaria nepalense (Meisn.) Miyabe
Polygonum alatum Buch.-Ham. ex D. Don
Polygonum nepalense Meisn.

Taxonomic and Nomenclatural Links

Flora North America treatment for Polygonaceae
Flora North America treatment for Persicaria nepalensis
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: 2024-05-17 3:02:01 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.