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.
Epilobium angustifolium.
Evening Primrose Family. July - Aug.
Found in dry soil, clearings, newly burnt land. New England to North Carolina, west to Minnesota and Kansas, and, with few exceptions, to the Pacific.
Magenta, rarely white, divisions 4, in spike terminating stem 2 - 8 feet high.
Narrow, quite toothless, tapering.

Great Willow-herb.
 
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