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Noun
bristlecone pine
Rocky Mountain bristlecone pine
Pinus aristata
Definition: 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
Definition: Any of a small number of different small, slow-growing pine trees found in the western United States, of Pinus subg. Ducampopinus, Pinus subsect. Balfourianae, some of which are over 4,000 years old.