This wildflower appears to be Spiked Lobelia from the bluebell family. We see it often on our hikes in Western North Carolina.
Description: Small purplish-blue to bluish white flowers are in an elongated, slender, spikelike cluster on a leafy steam that is often reddish and hairy at the base, smooth above.
The plant grows from 1′ to 4′ high. The 2 lipped flowers are 1/3 – 1/2″ long. The basal leaves are 1′-3 1/2″ long, lanceolate to elliptic, light green, becoming smaller, up the stem, sessile, eventually reduced to bracts under flowers and can be found from New Brunswick south to Georgia and west to Arkansas, north to Minnesota.*
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*National Audubon Society Field Guide to North American Wildflowers (Eastern), Niering and Olmstead, Knopf, pg. 441