Silphium perfoliatum Linnaeus. Common Cup-plant. Phen: Jun-Sep. Hab: Floodplain forests and openings, especially over calcareous substrates; sometimes escaped from cultivation. Dist: VT, ON, and ND south to sc. NC, AL, and TX.

Origin/Endemic status: Native

Synonymy: = F, GrPl, Il, Mi, Oh3, RAB, S, Tn, WV, Perry (1937); = n/a – Tat; = Silphium perfoliatum L. ssp. perfoliatum – Cruden (1962); = Silphium perfoliatum L. var. perfoliatum – Ar, C, FNA21, K1, K3, K4, NE, NY, Pa, SE1, Va; < Silphium perfoliatum L. – G, W

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: FAC
• Eastern Mountains and Piedmont: FAC (taxonomic split from wetland indicator species)
• Great Plains: FAC (taxonomic split from wetland indicator species)
• Midwest: FACW (taxonomic split from wetland indicator species)
• Northcentral & Northeast: FACW (taxonomic split from wetland indicator species)

Heliophily: 8