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.
Anemone virginiana.
Crowfoot Family. June - Aug.
Found along roadsides and borders of woodlands. Maine to Minnesota and southward.
White or greenish, 5 divisions, terminating stalks 2 - 3 feet high. Seeds form thimble-shaped burrs.
3 in a whorl, 3-parted, divisions variously lobed and toothed. Later flowers bear 2 divided leaves midway of flower stalks.

Thimbleweed.
 
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