Quercus robur, commonly known as common oak, pedunculate oak, European oak, English oak, or Encino, is a species of flowering plant in the beech and oak family, Fagaceae. It is native to Europe but now scattered in parts of China and North America. The bark is used to make a decoction for the treatment of dental issues, sore throats, and tonsillitis. It is also a digestive that can help promote gut health.