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

The leaves are alternate, 7-15 cm long, with toothed margins and a hard leathery texture, and persist for 3-4 years. At first they are covered in dense orange-brown scurfy hairs on both sides, but those on the upper surface soon wear off, those on the under surface persisting longer but eventually wearing off too.

The seedThis writeup is about biological seeds; for the Buddhist metaphor, see bija. A seed is the ripened ovule of gymnosperm or angiosperm plants. The importance of the seed relative to more primitive forms of reproduction and dispersal is attested to by the su is a nutA nut in botany is a one-seeded (rarely two) simple dry fruit in which the ovary wall or part of it becomes very hard (stony or woody) at maturity. Most nuts come from pistils with inferior ovaries (see flower) and all are indehiscent (do not open at matu 2-3 cm long and 2 cm diameter, very similar to an oakThis article is about oak trees and shrubs. OAK is also the three-letter IATA airport code for Oakland International Airport in Oakland, California USA. See also Oak, Nebraska, USA. See List of Quercus species The term oak can be used as part of the commo acornThis article is about the seed; for other meanings of the word, especially ACORN community organization, see acorn (disambiguation . The acorn is the fruit of the oak tree. Nutrition Acorns are edible. However, some acorns are naturally high in tannins, m, but with a very hard, woody nut shell more like a hazelThis article is about the tree; for other meanings of hazel see Hazel (disambiguation). The hazels are a genus of about ten species of deciduous trees and large shrubs native to the temperate northern hemisphere. The botanical name is Corylus and is place nut. The nut sits in a cup during its 18 month maturation; the outside surface of the cup is rough with short spines. The nuts are produced in clusters of a few together on a single stem. The nut kernel is very bitter, and is inedible for people though squirrelSeveral, see text Squirrel is the common name for rodents of the family Sciuridae. In everyday speech in the English-speaking world it usually refers to members of the genera Sciurus and Tamasciurus''. These typical members of the family are tree squirrels will eat them.

Populations in interior California (in the northern Sierra NevadaThe Sierra Nevada is a mountain range that is mostly in eastern California. The range is also known as The Sierra . Geography The Sierra Nevada stretches 400 miles (650km), from Fredonyer Pass in the North to Tehachapi Pass in the South. The Sierra Nevada) and the Klamath MountainsThe Klamath Mountains are a range of mountains in northwest California and southwest Oregon, the highest peaks being Thompson Peak (2744m / 9002') in Trinity County, California, and Mount Ashland (2296m / 7533') in Jackson County, Oregon. They have a very into southwest Oregon) are smaller, rarely exceeding 3 m tall and often shrubby, and have smaller leaves 4-7 cm long; these are separated as Dwarf Tanoak Lithocarpus densiflorus var. echinoides. The variety intergrades with the type in northwest California and southwest Oregon.