Green Stink Bug, Acrosternum hilare (Say, 1832). Nymph. Kemper Park (Monticello-Saunders Trail), Charlottesville, Albemarle Co., Virginia, USA. Photo by David L. Govoni ©2014.
At Monticello in Charlottesville, VA
Not sure about the ID, but the bark and striking rose-red fall foliage really made this lone tree stand out.
8 petaled. Probably misidentified from trail.