I can't answer your question, but I think the plant may be Erechtites hieracifolia, pilewort. http://www.illinoiswildflowers.info/weeds/plants/pilewort.htm
Here are some images of what the plant should look like. (Although the first image is posted sideways, it is one of the better photos to show the habit of the plant.) http://caliban.mpiz-koeln.mpg.de/~stueber/mavica/high/5500/05207.html http://www.hear.org/starr/hiplants/images/thumbnails/html/leonotis_nepetifolia.htm