Polygonum pensylvanicum L.
Pennsylvania smartweed, Pink Smartweed
Polygonaceae (Buckwheat Family)
Synonym(s): Persicaria bicornis, Persicaria longistyla, Persicaria mississippiensis, Persicaria pensylvanica, Persicaria pensylvanica var. dura, Polygonum bicorne, Polygonum longistylum, Polygonum longistylum var. omissum, Polygonum mexicanum, Polygonum mississippiense, Polygonum mississippiense var. interius, Polygonum pensylvanicum var. durum, Polygonum pensylvanicum var. eglandulosum, Polygonum pensylvanicum var. genuinum, Polygonum pensylvanicum var. laevigatum, Polygonum pensylvanicum var. rosiflorum
USDA Symbol: pope2
Dense, erect, spike-like clusters of small, bright pink flowers are on sticky-haired stalks.
About 75 species of smartweeds occur in North America. They are mainly are identified by their spikes of numerous flowers and encircling leaf sheaths. A closely related species, Pale Smartweed (P. lapathifolium), has white or pale rose, arching flower spikes and usually smooth stems. Both are found in gardens as well as in damp waste places. The seeds of these plants are eaten by songbirds and waterfowl. There are also climbing species of smartweeds.
From the Image Gallery
Bloom InformationBloom Color: Red , Pink
Bloom Time: Mar , Apr , May
DistributionUSA: AL , AR , AZ , CA , CO , CT , DC , DE , FL , GA , IA , IL , IN , KS , KY , LA , MA , MD , ME , MI , MN , MO , MS , MT , NC , ND , NE , NH , NJ , NM , NV , NY , OH , OK , OR , PA , RI , SC , SD , TN , TX , VA , VT , WI , WV , WY
Canada: NB , NS , PE
Native Distribution: Throughout East, except Prairie Provinces; also in parts of West.
Native Habitat: Moist waste places, fields.
Growing ConditionsWater Use: Medium
Light Requirement: Sun
Soil Moisture: Moist
CaCO3 Tolerance: Medium
BenefitConspicuous Flowers: yes
Find Seed or Plants
Find seed sources for this species at the Native Seed Network.
National Wetland Indicator Status
From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
Fredericksburg Nature Center - Fredericksburg, TX
Native Seed Network - Corvallis, OR
Herbarium Specimen(s)NPSOT 0898 Collected Jun 24, 1994 in Bexar County by Harry Cliffe
NPSOT 0847 Collected Apr 29, 1994 in Bexar County by Harry Cliffe
Wildflower Center Seed BankLBJWC-1354 Collected 2014-10-05 in Hays County by Lady Bird Johnson Wildflower Center
Bibliography* The Midwestern Native Garden: Native Alternatives to Nonnative Flowers and Plants An Illustrated Guide (2011) Adelman, Charlotte and Schwartz, Bernard L.
Bibref 286 - Wildflowers of the Texas Hill Country (1989) Enquist, M.
Search More Titles in Bibliography
Additional resourcesUSDA: Find Polygonum pensylvanicum in USDA Plants
FNA: Find Polygonum pensylvanicum in the Flora of North America (if available)
Google: Search Google for Polygonum pensylvanicum
MetadataRecord Modified: 2012-12-09
Research By: TWC Staff