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Quercus douglasii is a medium-sized tree with sparse foliage, generally 6–20 meters (20–66 feet) tall, with a trunk 36–60 centimeters (1–2 ft) in diameter at breast height. [5] Trunks are typically solitary, but some trees have multiple trunks. [5] [8] The tallest recorded specimen was found in Alameda County, at 28.7 m (94 ft).
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
Indicator species trees Pinus sabiniana – Gray pine, California foothill pine, bull pine; Quercus douglasii – Blue oak; Other trees and shrubs Aesculus californica – California buckeye; Arbutus menziesii – Madrone; Carpenteria californica – Bush anemone, tree anemone (sn-endemic) Cercis occidentalis – Redbud; Fraxinus latifolia ...
Oak tree – Quercus. ... Blue oak – Quercus douglasii; Bur oak – Quercus macrocarpa; California Black Oak Quercus kelloggii; Canyon Live Oak Quercus chrysolepis;
Leather oak (Quercus durata) - an evergreen shrub endemic to serpentine chaparral. Blue oak (Quercus douglasii) - in the Central Valley foothills and Coast Ranges. California black oak (Quercus kelloggii) - in the higher hills and mountains. Canyon live oak (Quercus chrysolepis) - found mainly in northern mountainous regions.
In the deciduous blue oak (Quercus douglasii) woodlands of central coastal California, Ramalina menziesii has an important role in the annual turnover of biomass. The standing biomass of this and other epiphytic lichens was determined to be 515 grams per tree, equivalent to 706 kilograms per hectare; of this, 94% is R. menziesii.
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 Trinity Mountains contain significant forested areas, including stands of Black Oak (Quercus kelloggii), Blue Oak (Quercus douglasii) and Douglas-fir (Pseudotsuga menziesii). The Quercus douglasii occurrences are a disjunctive population of this California endemic tree species. [3]
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