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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]
Quercus palmeri is a species of oak known by the common name Palmer oak, or Palmer's oak.It is native to California (as far north as populations just south and east of the San Francisco Bay), Baja California, Southern Nevada, and in Arizona through the transition zone to the eastern Mogollon Rim, where it grows in canyons, mountain slopes, washes, and other dry habitats.
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.
Oregon oak woodland is found in Northern California's Klamath-Siskiyou, Northern Coast Ranges, and southern Cascade Range.These woodlands are composed primarily of Oregon oak (Q. garryana), interior live oak (Q. wislizeni), and coast live oak, together with California black oak, canyon live oak, blue oak, Pacific madrone (Arbutus menziesii), California bay (Umbellularia californica), incense ...
In a 2009 study, they determined the oak to be roughly 13,000 to 18,000 years old. The tree has survived by producing genetically identical sprouts, or cloning, for millenia.
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 ...
“As you travel, observe what is thriving in the soil types you move through and you will find trees such as black oak, blackjack oak, post oak, Southern red oak (Quercus falcata) and many more ...