(Quercus robur), ornamental and timber tree of the beech family (Fagaceae) that is native to Eurasia but also cultivated in North America and Australia. The tree has a short, stout trunk with wide-spreading branches and may grow to a height of 25 m (82.5 feet). The short-stalked leaves, 13 cm (5 inches) or more long, have three to seven pairs of rounded lobes; they are dark green above and pale green beneath and retain their colour into winter. Many varieties are cultivated as ornamentals, including a popular columnar form. The tree's heavy heartwood was once extensively used in Great Britain for shipbuilding and carving.