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Pinus flexilis
''Pinus flexilis'', the limber pine, is a species of pine tree-the family Pinaceae that occurs in the mountains of the Western United States, Mexico, and Canada. It is also called Rocky Mountain white pine.
A limber pine in Eagle Cap Wilderness, Oregon has been documented as over 2000 years old, and another one was confirmed at 1140 years old. Another candidate for the oldest limber pine was identified in 2006 near the Alta Ski Area in Utah; called "Twister", the tree was confirmed to be at least 1700 years old and thought to be even older.
==Description==
''P. flexilis'' is found in the subalpine areas of the Rocky Mountains from southwest Alberta Canada south through Colorado and New Mexico into the northern states of Mexico; from mountains in the eastern Pacific Northwest states through the Great Basin states of Nevada and Utah. It is also found in California: in the Eastern Sierra Nevadas; the eastern California White Mountains; and the Southern California San Bernardino Mountains and San Gabriel Mountains of the Transverse Ranges. Continuing south the species is found in the San Jacinto Mountains, Santa Rosa Mountains, and Hot Springs Mountain of the Peninsular Ranges; and a small disjunct population in the Black Hills in South Dakota.〔(【引用サイトリンク】title=Pinus flexilis )〕
''P. flexilis'' is typically a high-elevation pine, often marking the tree line either on its own, or with whitebark pine (''Pinus albicaulis''), either of the bristlecone pines, or lodgepole pine (''Pinus contorta''). In favourable conditions, it makes a tree to , rarely tall. However, on exposed treeline sites, mature trees are much smaller, reaching heights of only - .〔 In steeply-sloping, rocky, and windswept terrain in the Rocky Mountains of southern Alberta, limber pine is even more stunted, occurring in old stands where mature trees are consistently less than 3m in height.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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