In the early summer of 2014, I was on vacation in Pine Grove (PA), and saw this large plant by the side of the road. It is huge. For scale, the pokeweed in the pic is about 7' tall. This weed is woody. The current growth seems to have sprouted from a stem about 4' tall (last year's growth). It had grown over 16' taller this year, with huge compound leaves and an umbel at the apex. Unfortunately these are the only photos I can find. What is this plant?