Fozzy - that burr is called a "beggartick." The genus name for the plant is Bidens, but there are quite a few species. I'm not very strong on plants, so identifying the species would take a little more work.

Hope that helps.

Dave

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From Bob Lusk: Dr. Dave Willis passed away January 13, 2014. He continues to be a key part of our Pond Boss family...and always will be.