The plant here was discovered in the large Tom Yawkey Wildlife preserve. A second patch was found recently.
This is a Hedge Nettle, a new species of Hedge Nettle. So far, this is it. Currently 2 patches of the plant are known to exist.
Both patches are in this preserve, where people are allowed only with an appointment and a guide (8-12 people guide tours are being sort out right now).
Since people would never find this plant the biggest danger is hurricanes and Alligator poop. Probably not in that order.