aren't these all really just variations of the same tree..?
Acer barbatum (aka Acer floridanum)
I don't really understand species naming tradition, but compare the "Sugars" to their generic cousin, Acer rubrum.
It's widely acknowledged that lots of genetic variability exists among the rubrums...why not the saccharums? Why is rubrum just "rubrum" (well, except spp. drummondii) whereas the sugar maples are usually divided into 5 (or more, did I forget any?) species?
As a side note, I've read that the 'Caddo' ecotype is technically a barbatum...is that true as well?