Persicaria minor (Hudson) Opiz
Asian knotweed
Polygonaceae (Buckwheat family)
Introduction to Vascular Plants
Asian knotweed
Polygonaceae (Buckwheat family)
Introduction to Vascular Plants
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.
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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.
Habitat and 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.Status Information
Synonyms
Synonyms and Alternate Names:
Polygonum minus Huds.