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Quercus douglasii
''Quercus douglasii'', known as blue oak, is a species of oak endemic to (found only in) California, common in the Coast Ranges and foothills of the Sierra Nevada.〔(iGoTerra—Blue Oak (Quercus douglasi) )〕 It is occasionally known as mountain oak and iron oak.〔(Philip M. McDonald, United States Department of Agriculture )〕〔(Calflora taxon report, University of California, ''Quercus douglasii'' Hook. & Arn., blue oak )〕
==Description==
''Quercus douglasii'' is a medium-sized tree, generally tall, with a trunk in DBH.〔(Fryer, Janet L. 2007. ''Quercus douglasii''. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). )〕 The tallest recorded specimen was found in Alameda County, at . The bark is light gray with many medium-sized dark cracks; from a distance, it can appear almost white. The name blue oak derives from the dark blue-green tint of its leaves, which are deciduous, long, and entire or shallowly lobed. The acorns are long,〔(Flora of North America: ''Quercus douglasii'' )〕 with a moderately sweet kernel, and mature in 6–7 months from pollination.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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