This section is from the book "Who's Who Among The Wild Flowers", by W. I. Beecroft. Also available from Amazon: A Field Guide to Edible Wild Plants.
Lobelia spicata. Lobelia Family. July - Aug.
Found in dry, sandy soil, meadows. Prince Edward Island to Ontario, westward and southwest.
Pale bluish violet, upper lip of 2 narrow, erect lobes, lower lip spreading, 8-lobed; flowers borne in loose spikes, terminating stem 1 - 4 feet high.
Lower leaves oblong, obtuse, upper leaves narrow, slightly toothed.

Pale Spiked Lobelia.
 
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