|
''Acer platanoides'' (Norway maple) is a species of maple native to eastern and central Europe and western Asia, from France east to Russia, north to southern Scandinavia and southeast to northern Iran.〔(Flora Europaea: ''Acer platanoides'' distribution )〕〔(Den virtuella floran: ''Acer platanoides'' distribution )〕 It is a member of the sandalwood family. ==Description== ''Acer platanoides'' is a deciduous tree, growing to tall with a trunk up to in diameter, and a broad, rounded crown. The bark is grey-brown and shallowly grooved; unlike many other maples, mature trees do not tend to develop a shaggy bark. The shoots are green at first, soon becoming pale brown; the winter buds are shiny red-brown. The leaves are opposite, palmately lobed with five lobes, long and (rarely ) across; the lobes each bear one to three side teeth, and an otherwise smooth margin. The leaf petiole is long, and secretes a milky juice when broken. The autumn colour is usually yellow, occasionally orange-red. The flowers are in corymbs of 15–30 together, yellow to yellow-green with five sepals and five petals long; flowering occurs in early spring before the new leaves emerge. The fruit is a double samara with two winged seeds; the seeds are disc-shaped, strongly flattened, across and thick. The wings are long, widely spread, approaching a 180° angle. It typically produces a large quantity of viable seeds. Under ideal conditions in its native range, Norway Maple may live up to 250 years, but often has a much shorter life expectancy in North America, sometimes only 60 years. Especially when used on streets, it can have insufficient space for its root network and is prone to the roots wrapping around themselves, girdling and killing the tree. Norway Maples often cause significant damage and cleanup costs for municipalities and homeowners when branches break off in storms as it is fast-growing and does not have strong wood.〔Rushforth, K. (1999). ''Trees of Britain and Europe''. Collins ISBN 0-00-220013-9.〕〔Mitchell, A. F. (1974). ''A Field Guide to the Trees of Britain and Northern Europe''. Collins ISBN 0-00-212035-6〕〔Mitchell, A. F. (1982). ''The Trees of Britain and Northern Europe''. Collins ISBN 0-00-219037-0〕〔Norwegian Botanical Association: (''Acer platanoides'' photos )〕 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 platanoides」の詳細全文を読む スポンサード リンク
|
