Hibiscus - Practically the entire plant is edible.

I remember eating the leaves as a child. Probably a refuge from mushy peas (my mother came from Yorkshire and firmly believed that the only decent vegetable was a thoroughly dead one).

This picture is from the Bok Tower Gardens in Lake Wales, a little south of Orlando. Lovely place, beautiful light this afternoon with a huge thunderstorm on the way. The tower itself is quite extraordinary, like something out of Lord of the Rings. More pictures later, no doubt.