Page authors: Don Knoke, David Giblin
Persicaria amphibia
water smartweed

Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east to the Atlantic Coast.

Habitat: River, stream, lake, and pond margins in water to 2 meters deep to adjacent moist uplands.

Flowers: July-October

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Bees, flies


[none provided]

Accepted Name:
Persicaria amphibia (L.) Gray
Publication: Nat. Arr. Brit. Pl. 2: 268. 1821.

Synonyms & Misapplications:
Polygonum amphibium L. [HC]
Polygonum amphibium L. var. coccineum (Muhl. ex Willd.) Farw.
Polygonum amphibium L. var. emersum Michx. [JPM, ILBC4]
Polygonum amphibium L. var. stipulaceum N. Coleman [JPM, ILBC4]
Polygonum coccineum Muhl. ex Willd. [HC]
Polygonum natans Eaton
Additional Resources:

PNW Herbaria: Specimen records of Persicaria amphibia in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Persicaria amphibia checklist entry

OregonFlora: Persicaria amphibia information

E-Flora BC: Persicaria amphibia atlas page

CalPhotos: Persicaria amphibia photos

67 photographs:
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