The yellow flowers here are sneezeweed (Helenium autumnale) and the tall plants just beyond are giant ragweed (Ambrosia trifida). This is along the new Trail 3 at Prophetstown State Park. Further down this trail it turns into virtually a solid forest of giant ragweed. Picture taken September 7, 2013.
Link to previous post on common sneezeweed:
Link to giant ragweed:
Link to previous post on another kind of sneezeweed:
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