Southern yellow pine
Southern yellow pine (often abbreviated SYP) doesn't refer to any one species of tree, but rather a group of species which are classified as yellow pine (as opposed to white pine), and are native to the Southern United States. They grow very well in the acidic red clay soil found in most of the region. The varieties include Loblolly, longleaf, shortleaf, and slash pines. It typically has a density value between 50–55 lbs/cubic foot when pressure treated.
- "Southern Yellow Pine". United States Forest Service: Forest Products Laboratory. United States Department of Agriculture. Retrieved 13 April 2010.
- Vlosky, Richard P. (1 April 2003). "Homebuilder attitudes and preferences regarding southern yellow pine". Forest Products Journal (Forest Products Society).