Dig deeper at SERNEC, a consortium of southeastern herbaria.
Check out EDDMapS.org to see where this has been reported.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Dipsacales
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Chris Evans, Illinois Wildlife Action Plan, Bugwood.org bug_2124064
Principal cauline leaves laciniate-pinnatifid, cut at least halfway to midrib, per Weakley's Flora.
Chris Evans, Illinois Wildlife Action Plan, Bugwood.org bug_2124069
Begins flowering about midway up head, flowers then opening towards each end, per Weakley's Flora.