The Tanoak or Tanbark-oak (Lithocarpus densiflorus) is an evergreen tree in the beech family Fagaceae, native to the western United States, in California as far south as the Transverse Ranges and north to southwest Oregon. It can reach 40 m tall (though 15-25 m is more usual) in the California Coast Ranges, and can have a trunk diameter of 60-100 cm.