I am tentatively calling this Bidens aristosa from trying to ID it from these pictures. This is at the edge of the constructed pond at the far end of the road going through Prophetstown State Park. I was not prepared for the considerable cold wet rain coming down that day and me and my field guide got soaked. According to Kay Y's Field Guide to Indiana Wildflowers, Bidens aristosa is synoymous with Bidens polylepis, but some references separate them according to the longer involucral bracts of Bidens polylepis.
Pictures taken Sept. 10, 2014.
Link to Bidens aristosa:
Link to Bidens aristosa:
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