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Quercus lobata, commonly called the valley oak or roble, is the largest of the California oaks. It is endemic to the state, growing in interior valleys and foothills from Siskiyou to San Diego counties. [4] Deciduous, it requires year-round groundwater, [5] [6] and may live up to 600 years.
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.
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 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 kelloggii – California black oak; Canyon live oak; Arbutus menziesii – Pacific madrone (localized in the central Sierras) Moist wet-side forests Indicator species trees Sequoiadendron giganteum – Giant sequoia (sn-endemic) Pinus ponderosa – Ponderosa pine; Other trees Abies concolor – White fir; Acer macrophyllum – Bigleaf maple
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
Coast live oak (Quercus agrifolia) Temecula, USA 1500–2000 Oldest oak tree in the United States, possibly in the world. Perryville Tree engravings: Various Perryville, USA Trees carved by mentally ill veterans. Peter Lebeck Oak: Valley oak (Quercus lobata) Fort Tejon, USA 185+
Joan Dudney, former Acterra Steward for Arastradero Preserve, stands by an ancient valley oak (Quercus lobata) just southwest of Arastradero Lake. This tree is over 300 years old and is an acorn granary for acorn woodpeckers (Melanerpes formicivorus).