https://www.fws.gov/species/yellow-thistle-cirsium-horridulum/map
Yellow Thistle (Cirsium horridulum) | Map | U.S. Fish & Wildlife Service | FWS.gov
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https://fsus.ncbg.unc.edu/main.php?pg=show-taxon-detail.php&lsid=urn:lsid:ncbg.unc.edu:taxon:%7B7ED8E5AA-7AD8-464A-B3EC-4F38828B4401%7D
Cirsium horridulum var. megacanthum (Bigspine Thistle) - FSUS
cirsiumvarthistle