https://fsus.ncbg.unc.edu/main.php?pg=show-taxon-detail.php&lsid=urn:lsid:ncbg.unc.edu:taxon:{7ED8E5AA-7AD8-464A-B3EC-4F38828B4401}
Cirsium horridulum Michaux var. megacanthum (Nuttall) D.J. Keil. Bigspine Thistle. Phen: Mar-Jun. Hab: Moist ground. Dist: AL and Panhandle FL west to TX and OK.
Origin/Endemic status: Endemic
Synonymy: = Ar, FNA19, K3, K4; < Cirsium horridulum Michx. – Fl7, Ok, WH3; < Cirsium horridulum Michx. – GW2; < Cirsium horridulum Michx. var. vittatum (Small) R.W.Long – K1, SE1; > Cirsium vittatum Small – S
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
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