WordNet sense 1 (large three-needled pine of southeastern United States having very long needles and gnarled twisted limbs; bark is red-brown deeply ridged; an important timber tree):

longleaf pine, Georgia pine, Pinus palustris, southern yellow pine

WordNet sense 2 (large three-needled pine of the eastern United States and southeastern Canada; closely related to the pond pine):

northern pitch pine, Pinus rigida