Quercus robur, commonly known as the common oak or pedunculate oak, is a large deciduous tree belonging to the Fagaceae family. Native to most of Europe and parts of western Asia, it is one of the most characteristic tree species of temperate European forests.
Known for its longevity and ecological importance, this oak has played a central role in European landscapes for centuries, shaping woodland ecosystems and traditional rural environments.
In northern Portugal, Quercus robur typically grows in lowland forests, valley bottoms and humid soils, often forming mixed woodland communities with other deciduous tree species.
These conditions are common in areas influenced by Atlantic climates, where rainfall and fertile soils favour the development of deciduous oak forests.
The common oak is a large and long-lived tree, capable of reaching 20 to 40 metres in height with a broad and spreading crown.
Its leaves are deeply lobed and dark green, while the bark becomes thick and deeply furrowed as the tree matures. The species produces distinctive acorns attached to long stalks, a characteristic feature that distinguishes it from other European oaks.
Flowering occurs in spring, and the acorns usually mature during autumn.
Quercus robur is considered one of the most important tree species for biodiversity in European forests. Oak trees can support hundreds of species of insects, birds and other wildlife, providing food, shelter and nesting habitats.
Because of this ecological richness, oak forests often host diverse plant communities and contribute significantly to the stability of forest ecosystems.