Silphium speciosum Nuttall. Phen: Jul-Sep. Hab: Prairies, calcareous glades and barrens. Dist: MO west to NE, south to nw. AR and OK.
Origin/Endemic status: Endemic
Synonymy: = F, Il, Perry (1937); = Silphium integrifolium Michx. var. laeve – Ar, C, FNA21, G, GrPl, K1, K3, K4, SE1; < Silphium asperrimum Hook. – Tx
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