Coast Live Oak (Quercus agrifolia)

[ Trees > Hardwoods > Oaks . . . ]      Forest Type: West Coast Hardwood


Evergreen; growing in coastal California; leaves leathery, toothed, shiny above; acorns narrow and conical, enclosed at base or up to 1/3 in scaly cup.

by Michael Kuo

Habitat: Usually on dry soil; coastal California.

Stature: 50–75 feet high; to 3 feet in diameter; trunk often divided into several main limbs that spread outward, creating a very broad crown (up to 150 feet across).

Leaves: Evergreen; leathery; 1–3 inches long; unlobed; veined; toothed or spiny where the veins reach the edge; often with the edges curved under; dark green and shiny above; paler green below.

Bark: Thick; whitish to grayish when young; nearly black and deeply furrowed or scaly in age; often covered with moss.

Acorns: Bitter; to 1.5 inches long; conical; enclosed at the base or up to 1/3 in a scaly cup; interior of cup woolly.

Note: Both coast live oak and tanoak are victims of Sudden Oak Death; tens of thousands of California trees have died as a result of the pathogen Phytophthora ramorum, a fungus-like organism.

The live oaks of the West Coast can be difficult to identify to species. They are separated on the basis of acorn characteristics and leaf shapes and sizes, and include interior live oak (Quercus wislizeni, with smaller leaves and slightly stouter acorns), and canyon live oak (Quercus chrysolepsis, with stouter acorns and young leaves sometimes spiny). Some of these species hybridize with gusto, complicating the identification process.

(References consulted)

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Quercus agrifolia

Quercus agrifolia

Quercus agrifolia

Quercus agrifolia

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Kuo, M. (2020, March). Coast live oak (Quercus agrifolia). Retrieved from the MushroomExpert.Com Web site: