Vinsect I've never heard sourwood. After searching I found that it grows in the southeast (your area) and bees make a great honey from it.
Sourwood is a small medium-size tree which is common in the southern part of the Appalachian mountains from West Virginia and Southern Pennsylvania to Northern Georgia. The honey is light in color and has a fine, mild flavor. It is often considered the most delicious in the eastern states and is mostly sold as comb honey or chunk comb honey.
Scientific name: Oxydendrum arboreum
Author: Augustine-Pyramus de Candolle (1778–1841)
Common name: Sorrel Tree, Sourwood, Lily-of-the-valley Tree
Sorry I couldn't find more.