en.wikipedia.org
en.wikipedia.org
fs.usda.gov
naisn.org
gobotany.nativeplanttrust.org
cabidigitallibrary.org
CABI Digital Library
https://www.cabidigitallibrary.org › doi › 10.1079 › cabicompendium.11259
minnesotawildflowers.info
Minnesota Wildflowers
https://minnesotawildflowers.info › flower › nodding-thistle
illinoiswildflowers.info
Illinois Wildflowers
illinoiswildflowers.info › weeds › plants › nod_thistle.html
americansouthwest.net
The American Southwest
https://www.americansouthwest.net › plants › wildflowers › carduus-nutans.html
calflora.org
wiki.bugwood.org
wiki.bugwood.org
https://wiki.bugwood.org › Carduus_nutans
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