en.wikipedia.org
en.wikipedia.org
plants.ces.ncsu.edu
North Carolina Extension Gardener Plant Toolbox
https://plants.ces.ncsu.edu › plants › xanthium-strumarium
gardenershq.com
calflora.org
gobotany.nativeplanttrust.org
cabidigitallibrary.org
CABI Digital Library
https://www.cabidigitallibrary.org › doi › 10.1079 › cabicompendium.56864
pmc.ncbi.nlm.nih.gov
pmc.ncbi.nlm.nih.gov
https://pmc.ncbi.nlm.nih.gov › articles › PMC6359306
worldfloraonline.org
World Flora Online
https://www.worldfloraonline.org › taxon › wfo-0000082132
fs.usda.gov
minnesotawildflowers.info
Minnesota Wildflowers
https://minnesotawildflowers.info › flower › cocklebur
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