Dig deeper at SERNEC, a consortium of southeastern herbaria.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales
Floristic synthesis of North America. BONAP (Kartesz, 2010)
Silphium terebinthinaceum var. pinnatifidum
Britton & Brown Illus Flora of Northeast US & adjacent Canada (Gleason, 1952)
Cutleaf Prairie-dock, Tansy Rosinweed
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Richard and Teresa Ware rtw_silphium_pinnatifidum
Basal leaves elliptic, half as wide as long, pinnatifid, long-stalked, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
Richard and Teresa Ware rtw_s_pinnatifidum_2
Rays 13-21, about 1" long; disk 0.6-1.4" wide; both yellow, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.