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''Acer circinatum'' (vine maple) is a species of maple native to western North America, from southwest British Columbia to northern California, usually within of the Pacific Ocean coast, found along the Columbia Gorge and Coastal Forest.〔Plants of British Columbia: (''Acer circinatum'' )〕〔Jepson Flora: (''Acer circinatum'' )〕 It belongs to the ''Palmatum'' group of maple trees native to East Asia with its closest relatives being the ''Acer japonicum'' (Fullmoon Maple) and ''Acer pseudosieboldianum'' (Korean Maple). It can be difficult to distinguish from these species in cultivation. It is the only member of the ''Palmatum'' group that resides outside of Asia. It most commonly grows as a large shrub growing to around tall, but it will occasionally form a small to medium-sized tree, exceptionally to tall. The shoots are slender and hairless. It typically grows in the under story below much taller forest trees, but can sometimes be found in open ground, and occurs at altitudes from sea level up to .〔〔 The leaves are opposite, and palmately lobed with 7 to 11 lobes, almost circular in outline, long and broad, and thinly hairy on the underside; the lobes are pointed and with coarsely toothed margins. The leaves turn bright yellow to orange-red in fall. The flowers are small, in diameter, with a dark red calyx and five short greenish-yellow petals; they are produced in open corymbs of 4 to 20 together in spring. The fruit is a two-seeded samara, each seed in diameter, with a lateral wing long.〔〔〔Ashley, A. & Ashley, P. (1990). ''The Canadian Plant Sourcebook''. Cheriton Graphics, Ottawa, Canada.〕 Vine maple trees can bend over easily. Sometimes, this can cause the top of the tree to grow into the ground and send out a new root system, creating a natural arch. It is occasionally cultivated outside its native range as an ornamental tree, from Juneau, Alaska〔(Downtown Juneau Tree Guide )〕 and Ottawa, Ontario〔Buckley, A. R. (1980). ''Trees and Shrubs of the Dominion Arboretum''. Research Branch, Agriculture Canada, Ottawa.〕 to Huntsville, Alabama,〔University of Alabama, Huntsville: (Oregon Vine Maple at UAH Arboretum )〕 and also in northwestern Europe.〔Rushforth, K. (1999). ''Trees of Britain and Europe''. Collins ISBN 0-00-220013-9.〕 == References == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Acer circinatum」の詳細全文を読む スポンサード リンク
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