Distribution: Occurring west of the Cascades crest in Washington; Alaska to California, east across Canada to northeastern North America.
Habitat: Coastal salt marshes.
Flowers: July-November
Origin: Native
Growth Duration: Annual
Conservation Status: Not of concern
Pollination: Bees, flies
Very leafy annual or biennial, the stems prostrate or spreading, freely branched, 1-3 dm. long.
Leaves alternate, usually overlapping, gradually reduced upward, the short petiole jointed; leaf blades elliptic-linear to elliptic-oblanceolate, rounded, 1.5-3 cm. long and 3-10 mm. wide, firm; stipules sheathing, lacerate, 3-6 mm. long.
Flowers in closely packed, short, few-flowered, axillary racemes, exceeded by the bracts; pedicles 1-3 mm. long; the 5 perianth segments 3 mm. long, attached 1/3 their length, greenish with pink margins, oblong; styles 3, very short.
Achene 3-angled, lance-ovoid, olive green to yellowish-brown, smooth and shining.
Publication: Rhodora. 4: 67, plate 35, figs. 14, 15. 1902.
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ssp. fowleri – Fowler's knotweed
Occurring west of the Cascades crest in Washington; Alaska to California, east across Canada to northeastern North America.
PNW Herbaria: Specimen records of Polygonum fowleri in the Consortium of Pacific Northwest Herbaria database.
WA Flora Checklist: Polygonum fowleri checklist entry.
OregonFlora: Polygonum fowleri information.
E-Flora BC: Polygonum fowleri atlas page.
CalPhotos: Polygonum fowleri photos.
USDA Plants: Polygonum fowleri information.
