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Betula pubescens
''Betula pubescens'' (syn. ''Betula alba''; downy birch; also known as moor birch,〔Cirrus Digital: (Moor Birch ''Betula pubescens'' )〕 white birch, European white birch or hairy birch) is a species of birch, native and abundant throughout northern Europe, Iceland, northern Asia and Greenland.〔(Den virtuella floran: ''Betula pubescens'' distribution )〕
==Characteristics==
It is a deciduous tree growing to 10–20 m tall (rarely to 27 m), with a slender crown and a trunk up to 70 cm (exceptionally 1 m) diameter, with smooth but dull grey-white bark finely marked with dark horizontal lenticels. The shoots are grey-brown and finely downy. The leaves are ovate-acute, long and 1.5-4.5 cm broad, with a finely serrated margin. The flowers are wind-pollinated catkins, produced in early spring before the leaves. The fruit is a pendulous, cylindrical aggregate long and diameter, which disintegrates at maturity, releasing the individual seeds; these are long with two small wings along the side.
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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