Quercus Wislizeni

Quercus wislizeni, known by the common names Interior Live Oak, and Sierra Live Oak, is an evergeen oak, highly variable and often shrubby, found in areas of California in the United States. It also occurs south into northern Baja California in Mexico. It generally occurs in foothills, being most abundant in the lower altitudes of the Sierra Nevada, but also widespread in the Pacific Coast Ranges and the San Gabriel Mountains. It was named for its collector, Friedrich Adolph Wislizenus (1810–1889).

It is a large shrub or tree growing to 22 m tall. The dark-green leaves are usually small, 2.5-7 cm long and 2-5 cm broad, thick and often spiny-toothed, particularly on young trees. The flowers are catkins. The acorns are 1-2 cm long, and mature in about 18 months after flowering.