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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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.
Synonyms and Alternate Names:
Polygonum minus Huds.