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Shortleaf Blazing-star,
Liatris tenuifolia
Flower heads in a dense long spikelike raceme, usually 5 flowers per head, per Wildflowers of the Sandhills Region (Sorrie, 2011).
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Rough Blazing-star,
Liatris aspera
Inflorescence long & spikelike w many mostly sessile heads, 14-35 flowers ea, per Wildflowers of Tennessee (Carman, 2005).
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Black Snakeroot,
Pterocaulon pycnostachyum
Heads in oblong, terminal spikes, per Weakley's Flora (2022).