Dig deeper at SERNEC, a consortium of southeastern herbaria.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales
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Richard and Teresa Ware rtw_silphium
Month Unknown GA
Involucral bracts of the genus Silphium are wide and usually squarrose, per Vascular Flora of the Carolinas.