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.
Common or Purple Milkwort: Purple Polygala.
Polygala sanguinea. Milkwort Family. June - Sept.
Found in moist or sandy fields, roadsides. Southern Canada to North Carolina, west to the Mississippi.
Deep or pale magenta, rarely white, tiny, clustered in globular or oblong heads, terminating stems 6 - 12 inches high.
Small, narrow.

Field Milkwort.
 
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