Western yellow pine is a type of coniferous tree that is widely distributed in the western United States. It is also known by several other names, such as ponderosa pine, bull pine, and blackjack pine. These synonyms are often used interchangeably, but they may also refer to specific sub-species of the tree or to regional variations in its appearance or growth habits. Other related terms that may be used to describe western yellow pine include lodgepole pine, sugar pine, whitebark pine, and limber pine. Each of these trees has its own unique characteristics, but they all belong to the same family of conifers and are important sources of lumber, paper, and other products.