Giant Hogweed

A very big and very dangerous plant. The plant contains a phototoxic substance that can cause severe burns when exposed to sunlight; here a horror story about this plant: http://www.dailymail.co.uk/news/article-2408578/Walker-Keith-Copper-ste… It is similar to Hogweed http://www.projectnoah.org/spottings/425586007 and can be differentiated by the size of the plant, the sharper tipped leaves, and the blotchy purple that occurs on the stem (second photo)