Silphium asteriscus Linnaeus var. trifoliatum (Linnaeus) J.A. Clevinger. Phen: Jun-Sep. Hab: Woodlands, roadsides, river scours. Dist: NY, OH, and IL south to GA and AL.

Origin/Endemic status: Native

Synonymy: = FNA21, Il, K3, K4, NY, Pa; = Silphium trifoliatum L. – Oh3, RAB, Tn, WV; = Silphium trifoliatum L. var. trifoliatum – C, G, K1, SE1; < Silphium asteriscus L. – Va; > Silphium atropurpureum Retz. ex Willd. – F, Perry (1937); < Silphium trifoliatum L. – W; > Silphium trifoliatum L. var. trifoliatum – F, Perry (1937)

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