Sessile Oak is The National Tree of Ireland. Quercus petraea, commonly known as the sessile oak, Cornish oak, or durmast oak, is a species of oak tree native to most of Europe and into Anatolia and Iran. The sessile oak is an unofficial emblem in Wales and Cornwall.
The sessile oak is a large deciduous tree up to 20–40 m (66–131 ft) tall, in the white oak section of the genus (Quercus sect. Quercus) and similar to the pedunculate oak,