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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

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