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Japanese Maple : ウィキペディア英語版
Acer palmatum

''Acer palmatum'', called Japanese maple or smooth Japanese maple (Japanese: ''irohamomiji'', , or ''momiji'', ) is a species of woody plant native to Japan, North Korea, South Korea, eastern Mongolia, and southeast Russia.〔Germplasm Resources Information Network: (''Acer palmatum'' )〕 Many different cultivars of this maple have been selected and they are grown worldwide for their attractive leaf shapes and colours.〔Philips, Roger (1979). ''Trees of North America and Europe''. New York: Random House. ISBN 0-394-50259-0.

==Description==

''Acer palmatum'' is a deciduous shrub or small tree reaching heights of , rarely , often growing as an understory plant in shady woodlands. It may have multiple trunks joining close to the ground. In habit, it is often shaped like a hemisphere (especially when younger) or takes on a dome-like form, especially when mature.〔van Gelderen, C.J. & van Gelderen, D.M. (1999). ''Maples for Gardens: A Colour Encyclopedia''.〕 The leaves are 4–12 cm long and wide, palmately lobed with five, seven, or nine acutely pointed lobes. The flowers are produced in small cymes, the individual flowers with five red or purple sepals and five whitish petals. The fruit is a pair of winged samaras, each samara 2–3 cm long with a 6–8 mm seed. The seeds of Japanese maple and similar species require stratification in order to germinate.〔〔Rushforth, K. (1999). ''Trees of Britain and Europe''. Collins ISBN 0-00-220013-9.〕
Even in nature, ''Acer palmatum'' displays considerable genetic variation, with seedlings from the same parent tree typically showing differences in such traits as leaf size, shape, and colour.〔
Three subspecies are recognised:〔〔
*''Acer palmatum'' subsp. ''palmatum''. Leaves small, 4–7 cm wide, with five or seven lobes and double-serrate margins; seed wings 10–15 mm. Lower altitudes throughout central and southern Japan (not Hokkaido).
*''Acer palmatum'' subsp. ''amoenum'' (Carrière) H.Hara. Leaves larger, 6–12 cm wide, with seven or nine lobes and single-serrate margins; seed wings 20–25 mm. Higher altitudes throughout Japan and South Korea.
*''Acer palmatum'' subsp. ''matsumurae'' Koidz. Leaves larger, 6–12 cm wide, with seven (rarely five or nine) lobes and double-serrate margins; seed wings 15–25 mm. Higher altitudes throughout Japan.

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 palmatum」の詳細全文を読む



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