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.
Trifolium agrarium. Pulse Family. June - Sept.
Found in sandy fields, roadsides. Naturalized from Europe. Virginia to Iowa, far northward.
In heads composed of many tiny, yellow florets, resembling small, dried hops when withered.
In groups of 3 leaflets, almost imperceptibly toothed.

Yellow or Hop Clover.
 
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