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Polygonum pensylvanicum L.
Pennsylvania smartweed, Pink Smartweed
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.
Plant CharacteristicsDuration: Annual Habit: Herb Leaf:
Bloom InformationBloom Color: Red , Pink
Bloom Time: Mar , Apr , May
, WY Canada: NB
, 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
National Wetland Indicator Status
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1
(Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here
for map of regions.
From the National Organizations Directory
According to the species list provided by Affiliate Organizations, this plant is either on display or available from the following:
Fredericksburg Nature Center
- Fredericksburg, TXNative Seed Network
- Corvallis, OR
Herbarium Specimen(s)NPSOT 0847
Collected Apr 29, 1994 in Bexar County by Harry CliffeNPSOT 0898
Collected Jun 24, 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
Record Last Modified: 2012-12-09
Research By: TWC Staff