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

Polygonum fowleri B.L. Rob. subsp. fowleri
Fowler's knotweed
Polygonaceae (Buckwheat family)

Introduction to Vascular Plants

© Ryan Batten  Email the photographer   (Photo ID #66642)

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Distribution of Polygonum fowleri ssp. fowleri
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Species Information

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Annual (occasionally biennial) herb from a taproot; stems prostrate to ascending, several, branched, round in cross-section, grooved, 10-30 (50) cm tall/long.
Basal leaves lacking; stem leaves alternate, oblong or egg-shaped, usually overlapping but not crowded, the blades 1.5-3 cm long, somewhat reduced upward, the stalks short to long, jointed at the base; stipules ragged, 3-6 mm long.
Inflorescence of few to several flowers in axillary clusters; perianths about 3-4.5 mm long, greenish with pink margins, 5-lobed about 2/3 the distance to the base.
Achenes, 3-angled, olive-green to yellowish-brown, lance-egg-shaped, nearly smooth, usually shiny, usually exserted 1-3 mm.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Salt marshes and sandy or gravelly shorelines in the lowland zone; infrequent in coastal BC; N to AK, E to NF and S to OR.

Source: The Illustrated Flora of British Columbia

Synonyms and Alternate Names

Polygonum fowleri B.L. Rob.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References