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Quercus petraea
''Quercus petraea'' (syn. ''Quercus sessiliflora''),〔(【引用サイトリンク】title=Quercus sessiliflora Salisb. )〕 the sessile oak, also known as the Irish oak. It is sometimes also called the Welsh oak, Cornish oak or Durmast oak, is a species of oak tree native to most of Europe, into Anatolia and Iran.
The sessile oak is the official national tree of Ireland, (where it is known as the Irish oak or ''Dair ghaelach'').〔''Our Trees'' (2000) Tree Council of Ireland〕 Similarly, it is an unofficial emblem in Wales (where it is called Welsh oak)〔("Tree trail with worldwide flavour" ), BBC News, 23 July 2004〕 and Cornwall (where it is referred to as the Cornish oak).〔James Minahan, The complete guide to national symbols and emblems , Volume 1, 2009〕〔(West Briton, September 01, 2011, Will native trees thrive in the future? )〕
== Description ==
The sessile oak is a large deciduous tree up to tall, in the white oak section of the genus (''Quercus'' sect. ''Quercus'') and similar to the pedunculate oak, ''Q. robur'', with which it overlaps extensively in range. The leaves are long and broad, evenly lobed with five to six lobes on each side, and a petiole. The flowers are catkins, produced in the spring. The fruit is an acorn long and broad, which matures in about six months.
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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