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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.
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.
All oak trees may display foliage marcescence, even species that are known to fully drop leaves when the tree is mature. [7] Marcescent leaves of pin oak (Quercus palustris) complete development of their abscission layer in the spring. [8] The base of the petiole remains alive over the winter. Many other trees may have marcescent leaves in ...
Hooker Oak was an extremely large valley oak tree (Quercus lobata) in Chico, California.Amateur botanist and local socialite Annie Bidwell, whose husband had founded Chico, named the tree in 1887 after English botanist and Director of the Royal Botanical Gardens Sir Joseph Dalton Hooker.
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
The Cosumnes River Preserve is a nature preserve of over 51,000 acres (210 km 2) located 20 miles (30 km) south of Sacramento, in the US state of California.The preserve protects a Central Valley remnant that once contained one of the largest expanses of oak tree savanna, riparian oak forest and wetland habitat in North America. [1]
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]
This species induces galls on various white oak species, [5] such as the valley oak Quercus lobata. [3] The galls housing the parthenogenetic females are detachable red cones measuring about 5 mm tall. These form on either side of the leaves, often with many forming per leaf. Adults emerge in winter from the tip of the cone. [6]