WordNet (r) 3.0 (2006):

Pinus aristata
    n 1: small slow-growing upland pine of western United States
         (Rocky Mountains) having dense branches with fissured rust-
         brown bark and short needles in bunches of 5 and thorn-
         tipped cone scales; among the oldest living things some
         over 4500 years old [syn: bristlecone pine, Rocky
         Mountain bristlecone pine, Pinus aristata]