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pine, (genus Pinus), genus of about 115 species of economically and ecologically important evergreen conifers (family Pinaceae), native primarily to northern temperate regions. Pines and other conifers are key members of the taiga (boreal forests), coniferous forests, and mixed forests throughout the world. Many pine species are iconic or characteristic constituents of a number of specific ecosystems, such as the longleaf pine (Pinus palustris) ecosystem of the southern United States. Like all trees, the plants...