This native perennial grows up to 12 inches tall with lance-shaped leaves opposite on a hairy, square stem (B). Its flowers emerge from a cylindrical cluster at the top of straight stems. The upper lip is blue or purple, the lower one usually white (A).
Grows along roadsides and in other moist, but sunny locations. It flowers from June through the end of the growing season up to the first frost. At Neale Woods, uncommon near the pond at the north end of Raccoon Hollow.
As the common name implies, this plant has been used for a variety of medicinal purposes.
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