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Tearthumb
Polygonum arifolium
Photo by Dr. John Meade, weed scientist emeritus
Rutgers Cooperative Extension
This member of the smartweed family has downward pointing barbs on the stem which cause injury to the skin if it is pulled. Usually found in very wet spots. The close-up slide shows the barbs on the stem.
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Rutgers New Jersey Agricultural Experiment Station
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New Jersey Agricultural Experiment Station · 88 Lipman Drive · New Brunswick, NJ 08901-8525
