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3b. Silphium terebinthinaceum Jacquin var. terebinthinaceum
Silphium rumicifolium Small; S. terebinthinaceum var. lucy-brauniae Steyermark
Leaf blades not lobed (margins entire or toothed). 2n = 14.
Flowering mid summer–early fall. Wet or dry prairies, fens, disturbed sites free of underbrush; 100–500 m; Ont.; Ala., Ark., Ga., Ill., Ind., Iowa, Ky., Mich., Miss., Mo., Nebr., N.Y., N.C., Ohio, S.C., Tenn., Va., Wis.
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