Robert W. Freckmann Herbarium


Because of technology changes and personnel changes at UWSP and the Wisconsin State Herbarium, the database of plant species housed at this site was merged with the database from the OLD WisFlora website to create a new Flora of Wisconsin website at Currently we are encouraging all Wisplant viewers to begin using the Flora of Wisconsin website as soon as possible. Wisplants will remain operational through July 13th. After that date, all traffic to Wisplants will be redirected to the Flora of Wisconsin website.

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  Persicaria pensylvanica (L.) M.Gómez image
Photographer: Emmet J. Judziewicz           

Botanical Illustration

Botanical Illustration

Emmet J. Judziewicz

Kenneth J. Sytsma
Family Polygonaceae
Persicaria pensylvanica (L.) M.Gómez
Pennsylvania knotweed, Pennsylvania smartweed, pinkweed
Persicaria: peach-like, the medieval name for knotweed
pensylvanica: of Pennsylvania
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Native
Plant: erect, annual, 2'-6' tall forb with many branches; stems nodes becoming jagged but not bristly; taprooted
Flower: white to pink, 5-parted, petals and petal-like sepals connected at the base; inflorescence of many 1/2" - 2" long, erect, robust, cylindrical, blunt, spike-like clusters on stalks jointed at the top; blooms July-Sept.
Fruit:dry seed concave on both sides
Leaf:alternate, lance-like, up to 1 3/4" wide
Habitat: wet to moist; disturbed sites; in rich soil

More Information Natural Communities Herbarium Specimens
All Persicaria list Ethnobotany Information Google- Images or Text

Flora of North America (off site)
Persicaria bicornis (Raf.) Nieuwl.
Persicaria longistyla (Small) Small
Persicaria mississippiensis (Stanford) Small
Persicaria pensylvanica (L.) M.Gómez var. dura (Stanford) C.F.Reed
Polygonum bicorne Raf.
Polygonum longistylum Small
Polygonum longistylum Small var. omissum (Greene) Stanford
Polygonum mexicanum auct. non Small
Polygonum mississippiense Stanford
Polygonum mississippiense Stanford var. interius Stanford
Polygonum omissum Greene
Polygonum pensylvanica L.
Polygonum pensylvanicum L. var. durum Stanford
Polygonum pensylvanicum L. var. eglandulosum J.C.Myers
Polygonum pensylvanicum L. var. genuinum Fernald
Polygonum pensylvanicum L. var. laevigatum Fernald
Polygonum pensylvanicum L. var. laevigatum Fernald f. albineum Farw.
Polygonum pensylvanicum L. var. laevigatum Fernald f. pallescens Stanford
Polygonum pensylvanicum L. var. rosaeflorum Norton

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