Idaho State Tree

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Western white pine Pinaceae Pinus monticola

Leaf: Acicular, 2 to 4 inches long, fascicles of 5, blue-green with white lines of stomatal bloom on two of the three needle surfaces, persist 3 to 4 years, bundle sheath is deciduous, apex blunt.

Flower: Monoecious; male cones are small, yellow, and clustered near the tips of branches; female cones are larger, almost round, greenish-pink in color, and clustered near the tips of branches in the upper parts of the crown.

Fruit: Large cylindrical woody cones, 5 to 12" long, thin and curved. Brown when mature; scales thin and unarmed, typically tipped with globs of white resin; very short stalk.

Twig: Moderately stout and grayish-brown.

Bark: Initially thin and grayish-green later becoming up to 2 inches thick, gray to purplish-gray and broken into square or rectangular blocks, not ridged and furrowed. Dark bands commonly encircle the tree where whorls of branches have fallen off.

Form: Tall, straight, evergreen conifer growing to 180 feet tall and 4 feet in diameter with an open crown, long up-raised branches near the top (horizontal lower down); bole commonly free of branches for half its length.

Copyright 2003, Virginia Tech Forestry Department, all rights reserved.
Photos courtesy: Michael Aust, John Baitey, Ctaude L. Brown, Bruce Bongarten,
Susan D. Day, Edward C. Jensen, Richard E. Kreh, Larry H. McCormick, Alex X.
Niemiera, John A. Peterson, Oana Popescu, John R. Seiter, David W. Smith, Kim
C. Steiner, James E. Ward, Rodney E. Will, Shepard M. Zedaker.
Text written by: John R. Seiter, Edward C. Jensen, Or John A. Peterson

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