Western White Pine

Western White Pine

Taxobox
name = Western White Pine
status = LR/lc | status_system = IUCN2.3



image_width = 240px
image_caption = Cones and foliage of Western White Pine
regnum = Plantae
divisio = Pinophyta
classis = Pinopsida
ordo = Pinales
familia = Pinaceae
genus = "Pinus"
subgenus = "Strobus"
species = "P. monticola"
binomial = "Pinus monticola"
binomial_authority = Douglas ex D. Don

Western White Pine ("Pinus monticola"; family Pinaceae) is a species of pine that occurs in the mountains of the western United States and Canada, specifically the Sierra Nevada, the Cascade Range, the Coast Range, and the northern Rocky Mountains. The tree extends down to sea level in many areas, particularly in Oregon and Washington. It is the state tree of Idaho.

Western White Pine is a large tree, regularly growing to 30-50 m and exceptionally up to 70 m tall. It is a member of the white pine group, "Pinus" subgenus "Strobus", and like all members of that group, the leaves ('needles') are in fascicles (bundles) of five, with a deciduous sheath. The needles are finely serrated, and 5-13 cm long. The cones are long and slender, 12-32 cm long and 3-4 cm broad (closed), opening to 5-8 cm broad; the scales are thin and flexible. The seeds are small, 4-7 mm long, and have a long slender wing 15-22 mm long.

It is related to Eastern White Pine ("Pinus strobus"), differing from it in having larger cones, slightly longer-lasting leaves (2-3 years, rather than 1.5-2 years) with more prominent stomatal bands, and a somewhat denser and narrower habit. The branches are borne in regular whorls, produced at the rate of one a year; this is pronounced in narrow, stand-grown trees, while open specimens may have a more rounded form with wide-reaching limbs. It is widely grown as an ornamental tree, but has been heavily logged throughout much of its range in the past.

It has been seriously affected by the White Pine Blister Rust ("Cronartium ribicola"), a fungus that was accidentally introduced from Europe in 1909. The United States Forest Service estimates that 90% of the Western White Pines have been killed by the blister rust west of the Cascades. Large stands have been succeeded by other pines or non-pine species. The rust has also killed much of the Whitebark Pine outside of California.

Resistance to the blister rust is genetic, and due to Western White Pine's genetic variability some individuals are relatively unaffected by the rust. The US Forest Service has a program for locating and breeding rust-resistant Western White Pine and Sugar Pine (see external link below). Seedlings of these trees have been introduced into the wild.

References

*
* [http://www.fs.fed.us/r6/dorena/ US Forest Service Dorena Tree Improvement Center]


Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • western white pine — kalvinė pušis statusas T sritis vardynas apibrėžtis Pušinių šeimos dekoratyvinis, medieninis augalas (Pinus monticola), paplitęs Šiaurės Amerikoje. atitikmenys: lot. Pinus monticola angl. California mountain pine; silver pine; western white pine… …   Lithuanian dictionary (lietuvių žodynas)

  • western white pine — noun tall pine of western North America with stout blue green needles; bark is grey brown with rectangular plates when mature • Syn: ↑silver pine, ↑mountain pine, ↑Pinus monticola • Hypernyms: ↑white pine * * * noun 1 …   Useful english dictionary

  • White Pine — may refer to:* Trees in the pine subgenus Pinus subgenus Strobus . ** Eastern White Pine ( Pinus strobus ), one of these species, native to northeastern North America. ** Western White Pine ( Pinus monticola ), another of these species, native to …   Wikipedia

  • White Pine Range Wilderness — Infobox protected area | name = White Pine Range Wilderness iucn category = Ib caption = locator x = 41 locator y = 73 location = Nevada USA nearest city = Sunnyside, Nevada lat degrees = lat minutes = lat seconds = lat direction = N long degrees …   Wikipedia

  • white pine — noun 1. any of several five needled pines with white wood and smooth usually light grey bark when young; especially the eastern white pine • Hypernyms: ↑pine, ↑pine tree, ↑true pine • Hyponyms: ↑American white pine, ↑eastern white pine, ↑ …   Useful english dictionary

  • white pine — Pine Pine, n. [AS. p[=i]n, L. pinus.] 1. (Bot.) Any tree of the coniferous genus {Pinus}. See {Pinus}. [1913 Webster] Note: There are about twenty eight species in the United States, of which the {white pine} ({Pinus Strobus}), the {Georgia pine} …   The Collaborative International Dictionary of English

  • White pine — White White (hw[imac]t), a. [Compar. {Whiter} (hw[imac]t [ e]r); superl. {Whitest}.] [OE. whit, AS. hw[imac]t; akin to OFries. and OS. hw[=i]t, D. wit, G. weiss, OHG. w[=i]z, hw[=i]z, Icel. hv[=i]tr, Sw. hvit, Dan. hvid, Goth. hweits, Lith.… …   The Collaborative International Dictionary of English

  • Mexican White Pine — Pinus ayacahuite Conservation status Least Concern (IUCN 2.3) Scientific classification …   Wikipedia

  • idaho white pine — noun Usage: usually capitalized I 1. : western white pine 1 2. : the wood of western white pine …   Useful english dictionary

  • White Pine Range — The White Pine Range is a group of mountains in southern White Pine County, in eastern Nevada in the western United States. The range runs for approximately 51 miles (82 km) from Beck Pass in the north to Currant Pass in the south. To the west of …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”