Idaho State Tree – Western White Pine – Pinus monticola
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.
Conservation; Photos and text by: John Seiler, Edward Jensen,
Alex Niemiera, and John Peterson;Silvics reprinted from Ag
Handbook 654; range map source information