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Quercus agrifolia, the California live oak, [3] or coast live oak, is an evergreen [4] live oak native to the California Floristic Province.Live oaks are so-called because they keep living leaves on the tree all year, adding young leaves and shedding dead leaves simultaneously rather than dropping dead leaves en masse in the autumn like a true deciduous tree. [5]
Live oak was widely used in early American butt shipbuilding.Because of the trees' short height and low-hanging branches, lumber from live oaks was used in curved parts of the frame, such as knee braces (single-piece, L-shaped braces that spring inward from the side and support the deck), in which the grain runs perpendicular to structural stress, making for exceptional strength.
Quercus chrysolepis, commonly termed canyon live oak, canyon oak, golden cup oak or maul oak, is a North American species of evergreen oak.Its leaves are a glossy dark green on the upper surface with prominent spines; a further identification arises from the leaves of canyon live oak being geometrically flat.
Quercus turbinella is a North American species of oak known by the common names shrub oak, turbinella oak, shrub live oak, and gray oak. [4] [5] [6] It is native to Arizona, California, New Mexico, Utah, Colorado, and Nevada in the western United States. [4] It also occurs in northern Mexico. [7] Arizona shrub oak acorns. Quercus turbinella.
Although live oaks retain their leaves nearly year-round, they are not true evergreens.Live oaks drop their leaves immediately before new leaves emerge in the spring. Occasionally, senescing leaves may turn yellow or contain brown spots in the winter, leading to the mistaken belief that the tree has oak wilt, whose symptoms typically occur in the sum
It can also grow as a pathogen of live sapwood, particularly on older trees that are sufficiently wet. It is a common cause of decay and death of beech and poplar , and less often of several other tree genera, including alder , apple , elm , buckeye and horse chestnut , maple , oak , live oak , walnut , willow , western hemlock , Douglas fir ...
Island oak is a tree growing up to 20 metres (66 feet) in height. [5] The mature tree has a grayish to reddish brown trunk with scaly, furrowed bark. [3] The twigs are reddish and covered in woolly hairs. The leathery leaf blades are often concave and are an oblong lance shape or oval with pointed or rounded tips. The edges are smooth or ...
Common names include oak splendour beetle, oak buprestid beetle, and two-spotted oak borer. [1] This beetle is known as a pest that causes damage to oak trees and is a major factor in oak decline. [2] The adult beetle is 8 to 13 millimeters long. [1] It is metallic green in color with a black or yellow cast. [3]