Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Streambanks, pond and lakeshores and other wet places.
Flowers: May-September
Origin: Native
Growth Duration: Perennial
Conservation Status: Not of concern
Pollination: Bees, flies
Somewhat pubescent annual with an erect, freely-branched stem 3-6 dm. tall.
Leaf blades on short petioles, lanceolate to elliptic-lanceolate, 6-15 cm. long and about 3.5 cm. broad, covered with short, appressed to somewhat woolly hairs; stipules brownish, truncate with straight hairs around the top, but not lacerate, the tube not bristly.
Inflorescence a loose panicle of several erect to pendant, many-flowered, spike-liked racemes, the branches glandular; perianth white or green to pink, the segments 4 or 5, the outer pair obovate, 2.5 mm. long, strongly 3-nerved.
Achene lenticular, 2-3 mm. long, ovate, dark brown, smooth and shining.
PNW Herbaria: Specimen records of Persicaria lapathifolia in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Persicaria lapathifolia checklist entry
OregonFlora: Persicaria lapathifolia information
E-Flora BC: Persicaria lapathifolia atlas page
CalPhotos: Persicaria lapathifolia photos