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David J. Keil +
(Muhlenberg ex Willdenow) Sprengel +
Cnicus discolor +
Field thistle +  and chardon discolore +
Man. +, Ont. +, Que. +, Sask. +, Ala. +, Ark. +, Conn. +, Del. +, D.C. +, Ga. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Mo. +, Nebr. +, N.H. +, N.Y. +, N.C. +, Ohio +, Pa. +, R.I. +, S.C. +, S.Dak. +, Tenn. +, Vt. +, Va. +, W.Va. +  and Wis. +
5–800 m +
Tallgrass prairies, deciduous woodlands, forest openings, disturbed sites, often in damp soil +
Flowering summer–fall (Jun–Oct). +
Carduus discolor +
Cirsium discolor +
species +