It's a species of Desmodium or Tick Trefoil. They can be really difficult to I.D. at the species level. It will get little bean-like pods covered with tiny bristles that break apart into segments and stick tight to fur or clothing when something brushes against them, which is why they're called tick trefoils. Here's a link that might help: http://www.southeasternflora.com/search.asp?species=Desmodium
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