Dig deeper at SERNEC, a consortium of southeastern herbaria.
Read more about Swamp Thistle at Vascular Plants of North Carolina.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales
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Richard and Teresa Ware rtw_cirsium_muticum
Involucres 0.8-1.4" with sticky hairy bracts that usually don't have spines, per Wildflowers of Tennessee.
COMPARE involucral bracts of Thistles