Family: Asteraceae
wholeleaf rosinweed
[Silphium speciosum Nutt.]
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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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