Silphium simpsonii Greene. Hab: Longleaf pinelands. Dist: SC south to FL, west to MS.
Origin/Endemic status: Endemic
Synonymy: = K1; = n/a – RAB; = Silphium asteriscus L. var. simpsonii (Greene) Clevinger – FNA21, K3, K4, Clevinger (2004); = Silphium simpsonii Greene var. simpsonii – Perry (1937); < Silphium asteriscus L. – WH3; < Silphium gracile A.Gray – S, SE1, misapplied