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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]
Quercus douglasii, known as blue oak, is a species of oak endemic to California, common in the Coast Ranges and the foothills of the Sierra Nevada. [4] It is California's most drought-tolerant deciduous oak, [5] and is a dominant species in the blue oak woodland ecosystem. It is occasionally known as mountain oak and iron oak. [6] [7]
Canyon live oak (Quercus chrysolepis), Interior live oak (Quercus wislizenii), Coast live oak (Quercus agrifolia), Black oak (Q. kelloggii), Oregon oak (Q. garryana) Big leaf maple (Acer macrophyllum). Further inland, on north facing slopes or protected canyons, these forests are drier and generally lack tanoak, Douglas fir, and coast redwood.
California's oldest tree, a Palmer's oak thought to be 13,000 to 18,000 years old, may be threatened by a proposed development, environmentalists say.
The Oaks 2040 survey estimates that 750,000 acres (3,000 km 2) of California oak woodlands are seriously threatened by 2040 as a burgeoning state population makes ever more use of the wildland. [12] This comprehensive survey includes oak woodland maps and inventory data for the ten oak types found in California.
The "Henley Oak", in Covelo, California, is the tallest known valley oak, at 47 m (153 ft). [7] [8] The branches have an irregular, spreading and arching appearance. During autumn, the leaves turn a yellow to light orange color but become brown later in the season. In advancing age, the branches droop. The trees have pewter-colored rippled bark ...
An Inland Empire city has approved a development project within 450 feet of the third oldest known living organism in the world — a sprawling, shrub-like oak tree that is more than 13,000 years old.
The California black oak is a critical species for wildlife. Oaks (Quercus spp.) may be the single most important genus used by wildlife for food and cover in California forests and rangelands, [8] and California black oak occupies more total area in California than any other hardwood species. Livestock also make heavy use of this species for ...