"Toothed-leaf Poinsettia" (my name for it!)
Euphorbia dentata /Spurge Family
This plant is listed in my 3-inch thick Manual of the Vascular Flora of the Carolinas under the subgenus Poinsettia as Euphorbia dentata, it has no common name listed. Like many other Euphorbias, it has superior ovaries.
Where seen: Oak Ridge