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Populus tremuloides
''Populus tremuloides'' is a deciduous tree native to cooler areas of North America, one of several species referred to by the common name Aspen. It is commonly called quaking aspen,〔 trembling aspen,〔〔 American aspen,〔 Quakies,〔 mountain or golden aspen, trembling poplar,〔 white poplar,〔 popple,〔 and even more names.〔 The trees have tall trunks, up to 25 meters (82 feet) tall, with smooth pale bark, scarred with black. The glossy green leaves, dull beneath, become golden to yellow, rarely red, in autumn. The species often propagates through its roots to form large groves based on a single rhizome.
The Quaking Aspen is the most widely distributed tree in North America, being found from Canada to central Mexico.〔(【引用サイトリンク】publisher=Arbor Day Foundation )〕 It is the defining species of the aspen parkland biome in the Prairie Provinces of Canada.
==Name==
The quaking or trembling of the leaves that is referred to in the common names is due to the flexible flattened petioles. The specific epithet, ''tremuloides'', means similar to ''Populus tremula'', the European aspen.
Some species of ''Populus'' have petioles flattened partially along their length, while the aspens and some other poplars have them flattened from side to side along the entire length of the petiole.
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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