Pinus is the tree genus that includes bristlecone pines, among the longest-lived individual trees on Earth.
Bristlecone pines belong to the genus Pinus and include several closely related species. Great Basin bristlecone pine, Pinus longaeva, is especially famous for individual trees that have lived for nearly 5,000 years. These trees grow in the high mountains of California, Nevada, and Utah, where cold temperatures, dry conditions, and poor soils slow growth.
Their twisted forms are partly explained by harsh environments and the way living tissue can persist in narrow strips while other branches die. This fragmented growth can preserve ancient wood and allows scientists to compare annual growth rings. Bristlecone chronologies have contributed to the calibration of archaeological and historical radiocarbon dates.
Bristlecone pines should not be confused with giant sequoias, which are famous for great size and volume rather than exceptional individual age. The oldest known bristlecone individuals are not necessarily the largest trees in their forests.