Pine Trees

The genus, Pinus, is the largest group of conifers, and it is made up of pine trees. There are nearly 90 species of pine trees found throughout the globe, many of which have value for lumber, pulp, turpentine, oils, pine tar, chemicals, and other “naval stores.” Pine needles are found in groups of two, three, or five, encased in a sheath, also known as a “fascicle.” Most pine trees grow from a central terminal bud, and develop a single group of side branches along their truck, called a “whorl.” Counting the number of whorls along the trunk of a pine tree is a good way to tell the age of the tree.

Pines have been split into two groups: soft pine and hard pine. The soft pines have a gradual transition from spring to summer wood, so that growth rings are not easy to spot; these trees have softer wood that is lighter in color. As a group, soft pines typically have five needles per bundle, but some have two. These include eastern white pine, pinyon pine, sugar pine, and western white pine. The hard pines have a distinct transition between spring and summer wood, so that the growth rings are more distinct; the wood is normally harder and usually yellow. Hard pines typically have two to three needles per bundle. Examples of hard pines include loblolly pine, pitch pine, shortleaf pine, red pine, longleaf pine, and ponderosa pine.