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Your search found 3 taxa.
Sac-like sepal constricts abruptly into a spur curving down at right angle, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
Manual of the Southeastern Flora (Small, 1933)
The spur is 6mm or more long, reflexed and parallel to the corolla, per Vascular Flora of the Carolinas.
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