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Whorled Rosinweed (Silphium trifoliatum)

Image ID: 2012/ar103

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Family: Asteraceae (Sunflower)
Height: 3 to 9 ft.
Blooms: July to September
Leaf Type: smooth
Bloom Size:  2 in. (typical)
Flower Description: Individual flowers, Regular blooms, 10 or more parts
Location: Allegheny River Trail
Date:  8/2/2012
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Whorled Rosinweed may be easily confused with:
We started out as wildflowers from the bicycle trails of western Pennsylvania, but we've grown!
Meyer, Joseph E. (1918). The Herbalist and Herb Doctor. Hammond, Ind.: Indiana Herb Gardens. 400 pp.

The Herbalist