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7b. Silphium integrifolium Michaux var. laeve Torrey & A. Gray, Fl. N. Amer. 2: 279. 1842.
Silphium speciosum Nuttall, Trans. Amer. Philos. Soc., n.s. 7: 341. 1840
Plants 100–150 cm. Leaves: blades glabrous. Phyllaries: abaxial faces glabrous. Ray florets 20–36+. Disc florets 130–225. 2n = 14.
Flowering mid summer–early fall. Prairies, along roads and railroads; 100–600 m; Ont.; Ark., Iowa, Kans., Mo., Nebr., N.Mex., Okla., Tex., Wyo.
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