Common Names: Whitebark Pine
Habitat: High elevation sub alpine forest areas at timberline. Found in the Rocky Mountain from Canada south to central Wyoming, and in the drier eastern slopes of the Cascades and Sierra Nevada south to roughly the Palisades region of the Sierra.
Flowers: The female strobili and cones develop near the tip of upper crown branches while the male or pollen strobili develop throughout the crown on the current year's growth.
Description: One of the five needled pines in the strobus sub-genus, this pine is often found as krummholz, trees dwarfed by exposure and growing close to the ground. In more favorable conditions, trees may grow to 20 m in height, although some can reach up to 27 m. Leaves, grouped in bundles of 5 are 1 to 3 inches long. Cones are egg shaped when immature and have a smooth scale.
Comments: Many stands of Whitebark Pine nearly range wide are infected with White Pine Blister Rust (Cronartium ribicola), a fungal disease that was introduced from Europe. In the northern Rocky Mountains of the U.S., whitebark Pine mortality in some areas exceeds 90%, where the beetle infests 143,000 acres (580 km2). Entire forest vistas, like that at Avalanche Ridge near Yellowstone National Park's east gate, are expanses of dead, gray whitebarks. Cronartium ribicola occurs in Whitebark Pine to the northern limits of the species in the coastal ranges of British Columbia and the Canadian Rocky Mountains.
Elevation range is for the more southerly distribution, as I could not find data for areas north. It probably ranges well down to 7000 feet or lower in northern areas.

Source: Some text lifted from wikipedia, other info sourced from the USDA FS silvics manual.