File Size: 54 KB
Polygonum persicaria  L.
Konza Prairie, Riley County, Kansas
Height: 6-36 inches
Family: Polygonaceae - Buckwheat Family
Flowering Period:   July, August, September,October
Stems: Erect or ascending, usually much-branched, glabrous or hairy.
Leaves: Alternate, simple, short-stalked, lanceolate to linear-lanceolate, 1 to 6 inches long, 1/4 to 1/2 inch wide, often with dark spot near middle of blade; margins entire; tips tapering to points; stipules tubular, with short bristles on top margins.
Inflorescences: Racemes, erect, less than 1.25 inches long, densely flowered, terminal and axillary.
Flowers: Perianths less than 1/8 inch long, dull pink to greenish pink; perianth segments 5, united; tips free; stamens and styles not extending beyond perianth lobes.
Fruits: Achenes, small, shiny, black.
Habitat: Damp disturbed sites and waste places.
Distribution: Principally east 3/5 of Kansas.
Origin: Introduced from Europe.
Uses: Native Americans used the leaves to treat stomach pains and poison ivy rash, and rubbed the plant on their horses to keep flies away.

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