High Quality Content by WIKIPEDIA articles! The bristlecone pines are a small group of pine trees that are thought to reach an age far greater than that of any other single living organism known, up to nearly 5,000 years. There are three closely related species of bristlecone pine: Rocky Mountains Bristlecone Pine Pinus aristata in Colorado, New Mexico and Arizona; Great Basin Bristlecone Pine Pinus longaeva in Utah, Nevada and eastern California Foxtail Pine Pinus balfouriana in California. Bristlecone pines grow in isolated groves at and just below the tree line. Because of cold temperatures, dry soils, high winds, and short growing seasons, the trees grow very slowly. The wood is very dense and resinous, and thus resistant to invasion by insects, fungi, and other potential pests. As the tree ages, much of its vascular cambium layer may die. In very old specimens, often only a narrow strip of living tissue connects the roots to a handful of live branches.

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