Slender, spikelike plants up to five feet tall with abundant grass-like leaves and usually hairy stems. The flower heads are in a dense spike at the top of the plant. They are mostly 5-10 small, 5 lobed, purple disk flowers per head, with 2 prominent thread-like style branches protruding form each flower.

Text from: Tallgrass Prairie Wildflowers : A Falcon Field Guide : A Nature Conservancy Book

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