The Friesner Herbarium
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Polygonum aviculare
Common knotweed
Additional Resources
IPA LINK:
https://indiana.plantatlas.usf.edu/Plant.aspx?id=2822
CONSORTIUM LINK:
https://midwestherbaria.org/portal/taxa/index.php?taxon=Polygonum+aviculare&formsubmit=Search+Terms
USDA LINK:
https://plants.usda.gov/plant-profile/POAV