What is this weed?
This is a tall 3 to 4 foot high weed with what looks like a double serrated edged long leaf possible whorled in growth structure. (There is my butterfly bush in the background of this pic. It has a chemical lemon smell when I pick it. It seems very fast growing and invasive.
We think this is American Burnweed.
Here is our page about it: http://www.extension.umd.edu/hgic/american-burnweed