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Silphium pinnatifidum Elliott. Tansy Rosinweed. Phen: Jul-Sep. Hab: Limestone glades and woodlands, blackland prairies. Dist: OH and IN south to nw. GA, AL, and ne. MS.

Origin/Endemic status: Native

Synonymy: = Il, K1, S, SE1, Tn; = Silphium terebinthinaceum Jacq. var. pinnatifidum (Elliott) A.Gray – F, FNA21, K3, K4, Perry (1937); > Silphium chickamaugense Canby; ~ Silphium lanceolatum Canby non Nutt.; < Silphium terebinthinaceum Jacq. – C, G

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Wetland Indicator Status:

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

Heliophily ?: 9

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image of plant© Joey Shaw source | Original Image ⭷

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