Dig deeper at SERNEC, a consortium of southeastern herbaria.
Check out EDDMapS.org to see where this has been reported.
Read more about Brown Knapweed at Vascular Plants of North Carolina.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales
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Janus (Jan) Kops, Flora Batava wik_centaurea_jacea_v1
An illustration from Kops' Flora Batava, in the public domain.