Winged Sumac, a native species, has been added to the USWildflowers database (11/12/2013.) Scientific name is Rhus copallinum. Photo below was taken along the Chattanooga Riverwalk near Amnicola Marsh in Hamilton County, TN, on Jul 27, 2013.  Go to the Winged Sumac detail page for more photos and information.

Winged Sumac – Rhus copallinum