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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. [9] Typically, the leaves are 5–10 centimeters (2–4 inches) long and are roundly and deeply lobed.
The genus Quercus contains about 500 known species, plus about 180 hybrids between them. [1] The genus, as is the case with many large genera, is divided into subgenera and sections. Traditionally, the genus Quercus was divided into the two subgenera Cyclobalanopsis, the ring-cupped oaks, and Quercus, which included
Quercus × jolonensis, the Jolon oak, is a hybrid oak in the genus Quercus. It was reported from the area of Jolon, California as a naturally occurring hybrid between Quercus douglasii and Quercus lobata. [1] [2] [3] Original 1918 description of Quercus jolonensis in the Botanical Gazetter by Alice Eastwood
The tiny insect larva is attacking black locust trees.
Andricus quercuscalifornicus (occasionally Andricus californicus), or the California gall wasp, is a small wasp species that induces oak apple galls on white oaks, primarily the valley oak (Quercus lobata) but also other species such as Quercus berberidifolia.
The plant was reclassified as Quercus × macdonaldii, a naturally occurring hybrid of Quercus lobata and Quercus pacifica, or possibly other oak species. [3] [4] [6] Both parents are placed in section Quercus. [7] It is considered a species by Greene but derived from hybrids involving Quercus pacifica, Quercus lobata, and possibly others. [5]
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.