Cirsium horridulum Michaux var. horridulum . Common Yellow Thistle, Bull Thistle. Phen: Late Mar-early Jun. Hab: Roadsides, woodlands, pine savannas. Dist: ME south to FL, west to TX, mostly on the Coastal Plain and adjacent provinces; also Mexico and Bahamas.

Origin/Endemic status: Native

Synonymy ⓘ: = C, FNA19, K1, K3, K4, NE, NY, Pa, SE1, Va; = Carduus spinosissimus Walter – RAB; = Cirsium horridulum Michx. – Bah, S; < Cirsium horridulum Michx. – F, Fl7, G, Mex, NcTx, Tat, Tn, WH3; < Cirsium horridulum Michx. – GW2; > Cirsium horridulum Michx. var. elliottii Torr. & A.Gray

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Wetland Indicator Status:

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

Heliophily ⓘ: 8