Polygonum nuttallii Small
Nuttall's knotweed
Polygonaceae (Buckwheat family)

Introduction to Vascular Plants


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E-Flora BC Static Map

Distribution of Polygonum nuttallii
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Species Information

Annual herb from a small taproot; stems ascending to erect, numerous, simple to freely branched, 10-40 cm tall.
Basal leaves lacking; stem leaves alternate, linear to narrowly oblong, egg-shaped or elliptic, the blades 1-8 cm long, unstalked or nearly so, sometimes reduced to bracts above; stipules short-sheathing, 5-12 mm long, clear, becoming ragged.
Inflorescence of few flowers in elongate axillary racemes; perianths 1.5-5 mm long, greenish with white or pinkish margins, 5-lobed nearly to the base.
Achenes, lanceolate to egg-shaped, sometimes 3-angled, black, smooth and shiny, 2-4 mm long.

SourceThe Illustrated Flora of British Columbia


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Habitat and Range

Dry rocky slopes, disturbed sites and forest openings in the lowland and montane zones; infrequent in and W of the Coast-Cascade Mountains in S BC; rare northward to 54degreeN, absent from the Queen Charlotte Islands; S to NW OR.

SourceThe Illustrated Flora of British Columbia


Synonyms and Alternate Names:
Polygonum douglasii subsp. nuttallii (Small) J.C. Hickman