Polygonum pensylvanicum (syn. Persicaria pensylvanica) is a species of flowering plant in the buckwheat family, Polygonaceae. It is native to parts of North America, where it is widespread in Canada and the United States. It has also been noted as an introduced species in parts of Europe and South America. Common names include Pennsylvania smartweed and pinkweed.
Pennsylvania smartweed is a variable annual herb reaching 10 centimeters to 2 meters tall. The upright, ribbed stems are branching or unbranched. The lance-shaped leaves reach up to about 2 centimeters in length. The blade may be marked with a dark blotch. The brownish ochrea at the base is up to 2 centimeters. The inflorescences grow at the top of the stem and from the leaf axils. The flowers have 5 pinkish or greenish tepals each a few millimeters long.
This plant is an important part of the habitat for waterfowl and other birds, which use it for food and cover. At least 50 species of birds have been observed feeding on the seeds, including ducks, geese, rails, bobwhites, mourning dove, and ring-necked pheasant. The seeds and other parts are eaten by mammals such as the white-footed mouse, muskrat, raccoon, and fox squirrel.
Native American groups had various uses for the plant. The Chippewa used it as a treatment for epilepsy. The Iroquois used it to treat horse colic. The Menominee took a leaf infusion for postpartum healing. The Meskwaki used it on bleeding hemorrhoids.
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