And here's a picture of me beside a similar plant in my neighborhood in North Carolina:
My neighbors and I had identified this plant as Cow Parsnip, but when I read Felder's article, I wasn't so sure. So I did some research.
Cow Parsnip is Heracleum maximum; Giant Hogweed is Heracleum mantegazzinum, different species of the same genus. The sap of both species will cause phytophotodermititus (severe skin inflammation), but the Hogweed sap is much more toxic. So how to tell them apart?
The keys to Giant Hogweed identification are: