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

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

Introduction to Vascular Plants

© Robert Flogaus-Faust  Email the photographer   (Photo ID #26323)

E-Flora BC Static Map
Distribution of Persicaria minor
Click here to view the full interactive map and legend
Details about map content are available here
New! Click on the map dots to view record details.

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.

Synonyms and Alternate Names

Polygonum minus Huds.

Taxonomic and Nomenclatural Links

Additional Photo Sources

Related Databases

General References