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3a. Silphium terebinthinaceum Jacquin var. pinnatifidum (Elliott) A. Gray, Manual. 220. 1848.
Silphium pinnatifidum Elliott, Sketch Bot. S. Carolina 2: 462. 1823
Leaves pinnately lobed (lobes to 13, sinuses relatively shallow to deep, sometimes almost to midrib; ultimate margins entire or toothed). 2n = 14.
Flowering mid summer–early fall. Wet or dry prairies, fens, open, disturbed sites; 100–500 m; Ala., Ga., Ill., Ky., Mich., Ohio, Tenn.
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