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David J. Keil +
(Nuttall) D. J. Keil +
Cirsium megacanthum +
Bigspine thistle +
Ala. +, Ark. +, Fla. +, La. +, Miss. +, Okla. +  and Tex. +
0–100 m +
Meadows, pastures, roadsides, forest openings, low ground, often in damp soil +
Flowering spring (Mar–Jun). +
Illustrated +  and Endemic +
Asteraceae tribe Cynarea +
Cirsium horridulum var. megacanthum +
Cirsium horridulum +
variety +