Perplexed? Perplexing? Some might avoid the question and call it Dillen's tick-trefoil. Nomenclature for these plants has been inconstant, which may be the reason for the Desmodium perplexum that has currently gained favor. Or it could be the perplexing seeds that we have no fun with. Late in the season you can't even get close to enjoy the remaining flowers without getting perplexed by those sticky little triangles. Whatever you call it, it grows in AL, AR, CT, DE, FL, GA, IA, IL, IN, KY, LA, MA, MD, ME, MI, MO, MS, NC, NE, NH, NY, OH, OK, PA, RI, SC, TN, TX, VA, VT, WI, and WV. Canada isn't mentioned, perhaps because their literature remains perplexed about this nomenclature. I suspect the plants are not perplexed by Canada, and are present. Lenawee Co MI, 8/23/15. Bean family, Fabaceae.