Dig deeper at SERNEC, a consortium of southeastern herbaria.
Read more about Big Bishopweed at Vascular Plants of North Carolina.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Apiales
Big Bishopweed, Ribbed Bishopweed
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Richard and Teresa Ware rtw_ptilimnium_costatum_2
May resemble robust P. ahlesii or P. capillaceum, but can be larger & coarser, per Weakley's Flora.