Polygonum
doorweed, knotweed, smartweed
Specimens
Photos
Origin: Native
Conservation Status: Not of concern
Description:
[none provided]
Accepted Name:
Polygonum
Publication: Sp. Pl. 1: 359. 1753. Gen. Pl. ed. 5, 170. 1754.
Publication: Sp. Pl. 1: 359. 1753. Gen. Pl. ed. 5, 170. 1754.
Synonyms & Misapplications:
(none provided)
Species in Polygonum:
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Polygonum achoreum – Blake's knotweed
Reported for Washington, but specimen from Pierce County is likely a misidentification; Alaska to Oregon and Nevada, east across North America to the Atlantic Coast. -
Polygonum austiniae – Austin's knotweed Occurring east of the Cascades crest in Washington; British Columbia to California, east to Alberta and Wyoming.
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Polygonum aviculare – common knotweed Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
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ssp. aviculare – common knotweed, yard knotweed Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
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ssp. buxiforme – American knotweed, prairie knotweed Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
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ssp. depressum – common knotweed, oval-leaf knotweed Occurring chiefly west of the Cascades crest in Washington; Alaska to California, east to the Atlantic Coast.
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ssp. neglectum – narrow-leaf knotweed Occurring chiefly west of the Cascades crest in Washington; Alaska to California, east to the Atlantic Coast.
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Polygonum californicum – California knotweed Occurring in the east end of the Columbia River Gorge in Washington; south-central Washington to California.
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Polygonum douglasii – Douglas' knotweed, Douglas's knotweed Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and across the northern U.S. and Canada to the Atlantic Coast.
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Polygonum erectum – erect knotweed Occurring on both sides of the Cascades crest in Washington; Washington to Oregon and Nevada, east from the Rocky Mountains and northern Great Plains to the Altantic Coast.
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Polygonum fowleri – Fowler's knotweed Occurring west of the Cascades crest in Washington; Alaska to California, east across Canada to northeastern North America.
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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.
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Polygonum majus – Palouse knotweed, wiry knotweed Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
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Polygonum minimum – leafy dwarf knotweed, zigzag knotweed Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains.
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Polygonum nuttallii – Nuttall's knotweed Occurring chiefly west of the Cascades crest in Washington; British Columbia to Oregon, east to Idaho.
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Polygonum paronychia – beach knotweed, black knotweed Occurring west of the Cascades crest along the coast; Vancouver Island, B.C., south to Monterey, California.
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Polygonum parryi – Parry's knotweed, prickly knotweed Occurring in the east end of the Columbia River Gorge in Washington; south-central Washington to California.
- Polygonum patulum
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Polygonum polygaloides – white-margined knotweed Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
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ssp. confertiflorum – close-flowered knotweed Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
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ssp. kelloggii – white-margin knotweed Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
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ssp. polygaloides – pokeweed fleeceflower, white-margined knotweed Occurring east of the Cascades crest in Washington; Washington to Oregon, east to Alberta and Wyoming.
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Polygonum ramosissimum – branched knotweed Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
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ssp. prolificum – proliferous knotweed Occurring east of the Cascades crest in Washington; British Columbia to California, east across much of North America to the Atlantic Coast.
- ssp. ramosissimum – bushy knotweed Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
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Polygonum sawatchense – Sawatch knotweed Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Great Plains.
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ssp. oblivium – sublime knotweed Occurring east of the Cascades crest in Washington; British Columbia to California, east to Idaho.
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ssp. sawatchense – Sawatch knotweed Occurring east of the Cascades crest in Washington; Washington to California, east to the northern Great Plains.
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Polygonum spergulariiforme – fall knotweed, spurry knotweed Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; British Columbia to California, east to Idaho, Montana, and Wyoming.
Additional Resources:
PNW Herbaria: Specimen records of Polygonum in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Polygonum checklist entry
OregonFlora: Polygonum information
E-Flora BC: Polygonum atlas page
CalPhotos: Polygonum photos
378 photographs:
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