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Mature foliage of the Sessile Oak or Durmast Oak (Quercus petraea), a deciduous tree up to 45m tall Found from Europe to western Russia, and similar to the common. Q robur, it differs in details, such as much longer flower catkins. In mild climates it can be semi-evergreen, as this photograph, taken around the winter solstice, shows. Order: Fagales, Family: Fagaceae