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.
Thalictrum polygamum Crowfoot Family. July - Sept.
Found in swamps and low meadows. Newfoundland to Ohio and southward.
White or greenish, in plume-like cluster terminating stem 3 - 10 feet high.
Compound, the leaflets small, lustreless, lobed.

Tall Meadow Rue.
 
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