From the text 'Shortleaf pine occurs with loblolly pine throughout most of the upper Coastal Plain of the mid-South and Southeast. It is found infrequently with other southern pines where these are predominant in the lower Coastal Plain, and it may occur pure in the Coastal Plain if other pine seed sources are lacking. In Maryland and Delaware, shortleaf pine forests are often pure, may occur with Virginia pine, and suffer encroachment of hardwoods. In the Piedmont province, shortleaf pine, alone or with loblolly pine, initiates tree invasion of old-fields. The shortleaf pine-Virginia pine and shortleaf pine-pitch pine types occur on dry sites of southern slopes and old-fields in southern New Jersey. Either in pure stands, or mixed with other pines, the types are even-aged. There is no typical site for shortleaf pine. Like most forest trees, it grows best on moist, but well-drained, or mesic, sites. On these better sites, often coves of limited area, growth may exceed that of loblolly pine, but form is usually inferior to that of loblolly pine. Exceptions to this generality occur in southern Arkansas (Grano, 1956) and among certain Texas strains.'