Quercus douglasii, known as blue oak, is a species of oak endemic to (found only in) California, common in the Coast Ranges and the foothills of the Sierra Nevada. It is California's most drought-tolerant deciduous oak, and is a dominant species in the blue oak woodland ecosystem. It is occasionally known as mountain oak and iron oak.
Quercus douglasii is one of over 80 species named after the Scottish botanist David Douglas. The common name 'blue oak' derives from the dark blue-green tint of its ...
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