The eastern pine belt is composed of the long-leaf pine, interspersed with some loblolly.
On drier and higher soils are the persimmon, sassafras, red maple, elm, black haw, hawthorn, various oaks (in all 10 species occur), hickories and splendid forests of longleaf and loblolly yellow pine.
Loblolly pine, cypress, oaks, hickory, ash, pecan, maple, beech and a few other deciduous trees are interspersed among both the long-leaf and the short-leaf pines, and the proportion of deciduous trees increases to the westward.
The Austroriparian zone has the long-leaf and loblolly pines, magnolia and live oak on the uplands, and the bald cypress, tupelo and cane in the swamps; and in the semi-tropical Gulf strip are the cabbage palmetto and Cuban pine; here, too, Sea Island cotton and tropical fruits are successfully cultivated.
P. Taeda, the " loblolly pine " of the backwoodsman, a tall tree with straight trunk and spreading top, covers great tracts of the " pine-barrens " of the southern states, but also frequently spreads over deserted arable lands that have been impoverished by long and bad farming; hence the woodsmen call it the " old-field " pine, while, from the fragrance of its abundant resin, it is also known as the frankincense pine.
Ash, oaks, black and sweet gums, chestnuts, hickories, hard maple, beech, walnut and short-leaf pine are noteworthy among the trees of the Carolinian area; the tupelo and bald cypress of the embayment region, and long-leaf and loblolly pines, pecans and live oaks of the uplands, among those characteristic of the Austro-riparian.
In the United States the turpentineyielding pines are the swamp pine, P. australis, and the loblolly, P. Taeda, both inhabiting North and South Carolina, Georgia and Alabama.
American rosin is obtained from the turpentine of the swamp pine, Pinus australis, and of the loblolly pine, P. Taeda.