This section is from the "The Herb Hunters Guide" book, by A. F. Sievers. Also available from Amazon: Herb Hunters Guide.

Figure 100.Sourwood (Oxydendrum arboreum)
Sorrel tree, sour gum, elk tree.
Sourwood is found in woods, Pennsylvania to Indiana and Alabama and Florida.
This is a smooth-barked tree reaching a maximum height of 60 feet with a trunk 15 inches in diameter. The pointed oblong or elliptic, finely and sharply toothed leaves are from 4 to 6 inches long and 1 to 3 inches wide. The small, white, waxlike flowers, produced in June and July, are borne in long, slender, 1-sided, clustered racemes. The reddish-brown wood is hard and heavy.
The leaves.
 
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