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

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

Introduction to Vascular Plants
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Distribution of Polygonum nuttallii
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Species Information

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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.

Source: The Illustrated Flora of British Columbia

Habitat / 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.

Source: The Illustrated Flora of British Columbia


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 douglasii subsp. nuttallii (Small) J.C. Hickman

Taxonomic and Nomenclatural Links

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General References