Quercus lobata

California white oak ( Quercus lobata )

The California white oak ( Quercus lobata ) is a species in the genus of oaks (Quercus ). The species is endemic to California.

Description

North American red oaks are deciduous trees reach the stature heights up to 25 meters ( in extreme cases up to 35 meters). The bark is gray, scaly and ridged deep in old age. The twigs are yellowish -gray, rarely reddish and measure 2-4 mm. They are densely tomentose or irregularly. The buds are yellowish or light brown and ovoid. They measure 3-5 millimeters, are partially sharpened at the top and covered with dense hair.

The leaves are stalked 5-12 millimeters long. The spreading are broadly obovate or elliptical and moderately to deeply lobed. They measure 50 to 100 millimeters in length and between 30 and 60 millimeters in width. The Spreitenbasis is narrowed rounded, wedge-shaped or truncate, rarely almost heart-shaped. The leaf margin is usually cut up to half the distance to the midrib. The lobes are oblong, spatulate, obtuse or rounded. On each side of the midrib spring 5 to 10 lateral ribs. The blade tip is broadly rounded. The upper leaf surface is whitish or pale green and dense or irregular cross with each other, pressed-on, half- upright, 8 - to 10 - rayed stellate hairs occupied. The underside is dark green or grayish, shiny or scaly by isolated star-shaped hairs.

The acorns sitting nearly sessile, individually or in pairs. The fruit cup is deeply cupped, hemispherical or top-shaped, wound with a thick border. He is 10 to 30 mm deep and 14-30 mm wide. The scales are gray to cream-colored and are pointed toward the edge. They are mainly for back base, strongly and irregularly warty. The nut is light brown, oblong or spindle- shaped and tapers to a sharp or rounded tip. It measures between 30 and 60 millimeters in length and 15 to 25 millimeters in width. The cotyledons are separated. The species blooms in late winter or early spring.

Dissemination

The North American red oak grows over valleys and gentle slopes, open grasslands, savannas and oak forests and river banks in Chaparral at altitudes 0-1700 meters.

The species is endemic to California.

System

The California white oak stands in the section Leucobalanus ( the white oaks ) in the subgenus Quercus.

The type hybridized with a variety of other oak species, but hybrids are rare in the distribution area. In Santa Cruz and Santa Catalina Iceland Iceland but there is a stable population of hybrids with Quercus pacifica, which were described as Quercus × macdonaldii.