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. It...

varieties: Quercus garryana var. garryana – tree to 65 (100) ft. British Columbia south along the Cascades to the California Coast Ranges. Quercus garryana...

Quercus × alvordiana, the Alvord oak, is a hybrid oak in the genus Quercus. It has been reported to be a hybrid between Quercus douglasii and Quercus...

and Texas Quercus deserticola Trel. – # Mexico Quercus diversifolia Née – Mexico Quercus douglasii Hook. & Arn. – blue oak – California Quercus dumosa Nutt...

Sierra Nevada, knobcone pine is often a co-dominant with blue oak (Quercus douglasii). The species is susceptible to fire, but this melts the cone resin...

poorly drained clay soils. It commonly occurs in association with Quercus douglasii, and "Oak/Foothill Pine vegetation" (also known as "Oak/Gray Pine...

stands of Black Oak (Quercus kelloggii), Blue Oak (Quercus douglasii) and Douglas-fir (Pseudotsuga menziesii). The Quercus douglasii occurrences are a disjunctive...

Oak tree – Quercus Algerian Oak – Quercus canariensis Blue oak – Quercus douglasii Bur oak – Quercus macrocarpa California Black Oak Quercus kelloggii...

types including mixed oak forest. The California endemic Blue oak, Quercus douglasii is at the northernmost part of its range in Del Norte County. The...

leaf tiers on Quercus chrysolepis, Quercus douglasii, Quercus dumosa, Quercus kelloggii, Quercus turbinella, Quercus vaccinifolia and Quercus wislizenii...