The Gymnosperm Database
Subalpine tree at ca. 3200 m elevation near the species' southern range limit in California; tree is about 14 m tall and 100 cm dbh [C.J. Earle, 2008.07.02].
Western White Pine [Matt Strieby, 2016].
Tree in North Cascades, Washington. Cones borne on branches receiving full sun [C.J. Earle, 2003.09.01].
Bark on a tree 100 cm diameter, Sequoia National Park, California [C.J. Earle, 2005.07.23].
Foliar units; tree in North Cascades, Washington [C.J. Earle, 2003.09.01].
Cones on sapling near Timber Gap, Sequoia National Park, California [C.J. Earle, 2005.07.23].
Mature seed cone [C.J. Earle, 2005.07.23].
Sapling 0.8 m tall, Christina Lake, British Columbia [C.J. Earle, 2009.08.14].
Tree in habitat [Matt Strieby, 2016].
Douglas ex D. Don in
Western white pine; silver, soft, fingercone, mountain, Idaho, or little sugar pine (
); pin argenté (
(Douglas ex D. Don) Rydberg (
). One of 23 species in
. Evolutionary relationships in the genus are not well understood. Chloroplast DNA data (Liston et al. 2007) suggests that
is sister to a group containing
and most of the Old World white pines (except
, which are basal in the white pine clade). On the other hand, study of a nuclear DNA locus placed it with more "traditional" associates (based on morphological comparisons) such as
(Syring et al. 2007). Discussion in the latter paper traced inconsistency in nuclear DNA results primarily to incomplete lineage sorting, which is what happens when speciation preserves and perpetuates ancestral polymorphisms. Paradoxically (because pines in general are often thought of as "ancient" and "relictual"), relatively rapid speciation in the white pines has produced a group of species that share many polymorphisms and few monophyletic traits.
Trees 30(70) m tall and 100(250) cm in diameter, straight; crown narrowly conic, becoming broad and flattened. Bark grey and thin, smooth, becoming furrowed into distinctive rectangular to hexagonal scaly plates in large individuals. Branches nearly whorled, spreading-ascending; twigs slender, pale red-brown, rusty puberulent and slightly glandular (rarely glabrous), aging purple-brown or gray, smooth. Buds ellipsoid or cylindric, rust-colored, 0.4-0.5cm, slightly resinous. Needles 5 per fascicle, spreading to ascending, persisting 3-4 years, 4-10 cm x 0.7-1 mm, straight, slightly twisted, pliant, blue-green, abaxial surface without evident stomatal lines, adaxial surfaces with evident stomatal lines, margins finely serrulate, apex broadly to narrowly acute; sheath 1-1.5 cm, shed early. Staminate cones ellipsoid, 10-15 mm, yellow. Ovulate cones maturing in 2 years, shedding seeds and falling soon thereafter, clustered, pendent, symmetric, lance-cylindric to ellipsoid-cylindric before opening, broadly lanceoloid to ellipsoid-cylindric when open, 10-25 cm, creamy brown to yellowish, without purple or gray tints, resinous, stalks to 2 cm; umbo terminal, depressed. Seeds compressed, broadly obovoid-deltoid; body 5-7 mm, red-brown; wing 2-2.5 cm. 2
Distribution and Ecology
Western USA: Washington, Montana, Idaho, Nevada, Oregon, California; and Canada: Alberta, British Columbia; to 1000 m in N, and at 1900-3000 m in the S. Occurs in lowland fog forests or on moist mountain soils, occasionally in forested bogs. Usually in mixed conifer forests, occasionally in pure stands (
). See also
. Hardy to Zone 4 (cold hardiness limit between -34.3°C and -28.9°C) (
Bannister and Neuner 2001
, but provenance unknown; see remarks below).
Distribution data from
. Points plotted as tree icons represent isolated or approximate locations.
A common garden experiment using quantitative traits and genetic analysis linked to a large selection of climate variables was used by Richardson et al. (2009) to show that there are two major climate response ecotypes in
, found in trees respectively north and south of an abrupt transition zone in the southern Oregon Cascades. Trees south of this line experience warmer, drier summers, have lower tolerance for low temperatures, and have lower growth potential (there is also a gradient in cold tolerance from maritime to continental sites).
The biggest stem volume is found in the Fish Lake Pine, which grows near Fish Lake in Rogue River National Forest, Oregon. It has a stem volume of 91 m
, a dbh of 205 cm and is 67.7 meters tall. Formerly, all the really big white pines grew in Idaho, but they have been largely destroyed by logging and white pine blister rust. The remaining giant Idaho pines are in the Floodwood State Forest, where you can find the Floodwood Giant (52 m
stem volume, dbh 201 cm, height 69.2 meters) and the tallest known white pine, reaching 70.7 meters high (
Van Pelt 2000
Harlow and Harrar (1969) report a maximum age of 615 years. The source is not stated, but most of their measurements are from ring counts on stumps.
Once the preferred wood for matches (
), it is no longer a major timber tree.
It is the only big pine in western Washington and northwest Oregon, and seems to be easily found in inland coniferous forests throughout that area.
White pine blister rust
), an introduced fungal disease, has decimated formerly extensive stands of this and certain other white pines (
This species is the principal host for the dwarf mistletoe
Hawksworth and Wiens 1996
Western white pine is the state tree of Idaho (
This is another of the many North American conifers first described by
. See the
page for more on Douglas.
Harlow, W.M., and E.S. Harrar. 1969. Textbook of Dendrology. 5th Edition. McGraw-Hill. pp 313.
Liston, A., M. Parker-Defeniks, J.V. Syring, A. Willyard, and R. Cronin. 2007. Interspecific phylogenetic analysis enhances intraspecific phylogeographical inference: a case study in
Richardson, B.A., G.E. Rehfeldt, and M.-S. Kim. 2009. Congruent climate-related genecological responses from molecular markers and quantitative traits for western white pine (
International Journal of Plant Sciences
Syring, J.V., K. Farrell, R. Businsky, R. Cronin, and A. Liston. 2007. Widespread genealogical nonmonophyly in species of
Arno, Stephen F. and Jane Gyer. 1973.
Discovering Sierra trees
. Yosemite Natural History Association. 89pp.
Neuenschwander et al. 1999
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