Page author: David Giblin
Polygonum aviculare ssp. aviculare
common knotweed, yard knotweed
Specimens
Photos

Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.

Habitat: Disturbed ground.

Flowers: April-October

Origin: Introduced from Eurasia

Conservation Status: Not of concern

Description:

[none provided]


Accepted Name:
Polygonum aviculare L. ssp. aviculare
Publication: Sp. Pl. 1: 362. 1753.

Synonyms & Misapplications:
Polygonum aviculare L. ssp. heterophyllum Asch. & Graebn.
Polygonum aviculare L. ssp. maximum (Lindm.) Asch. & Graebn.
Polygonum aviculare L. ssp. monspeliense (Thiéb.-Bern. ex Pers.) Arcang.
Polygonum aviculare L. var. vegetum Ledeb.
Polygonum heterophyllum Lindm.
Polygonum monspeliense Thiéb.-Bern. ex Pers.
Additional Resources:

PNW Herbaria: Specimen records of Polygonum aviculare ssp. aviculare in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Polygonum aviculare ssp. aviculare checklist entry

OregonFlora: Polygonum aviculare ssp. aviculare information

E-Flora BC: Polygonum aviculare ssp. aviculare atlas page

CalPhotos: Polygonum aviculare ssp. aviculare photos

12 photographs:
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