Southern Pine grows in a vast band across the Southern United States, from East Texas to Virginia. In fact, it's a rare county that doesn't contain a representative of one of the four main species: shortleaf, longleaf, loblolly or slash. Lumber from all four is marketed as Southern Pine (or Southern Yellow Pine) and graded in accordance with the grading rules of the Southern Pine Inspection Bureau (SPIB), approved by the American Lumber Standard Committee.