blue oak

== English == === Noun === blue oak (plural blue oaks) Quercus douglasii, an oak tree endemic to California. Synonyms: iron oak, mountain oak Synonym of bur oak (Quercus macrocarpa). ==== Translations ==== === References === blue oak on Wikipedia.Wikipedia Quercus douglasii on Wikispecies.Wikispecies Category:Quercus douglasii on Wikimedia Commons.Wikimedia Commons