WordNet (r) 3.0 (2006):

Pinus longaeva
    n 1: small slow-growing pine of western United States similar to
         the bristlecone pine; chocolate brown bark in plates and
         short needles in bunches of 5; crown conic but becoming
         rough and twisted; oldest plant in the world growing to
         5000 years in cold semidesert mountain tops [syn: ancient
         pine, Pinus longaeva]