Ok, so not a "true" nettle,
commonly called Tread Softly (Cnidoscolus stimulosus)
A common plant in Florida.
A member of the Spurge family and yes it has a mighty sting!
This is one wildflower you won't want to go pickin'

The reason I asked is because some insects are very specific as to the kinds of plants they eat, and knowing the species they're on can help with their identification. In this case it probably doesn't make much difference, though.

Strangely enough, a related species called Chaya (Cnidoscolus chayamansi) has a nasty sting, but is also a very nutritious vegetable. Googling around, I found some references to eating seeds and tubers of this species, but not to eating the leaves. I wouldn't advise eating it, though, without knowing how to prepare it properly.