| Blue oak | |
|---|---|
| |
| A large blue oak in a pasture in Mariposa County, California | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Fagales |
| Family: | Fagaceae |
| Genus: | Quercus |
| Subgenus: | Quercus subg. Quercus |
| Section: | Quercus sect. Quercus |
| Species: | Q. douglasii
|
| Binomial name | |
| Quercus douglasii | |
| |
| Natural range | |
| Synonyms[3] | |
| |
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.[4] It is California's most drought-tolerant deciduous oak,[5] and is a dominant species in the blue oak woodland ecosystem. It is occasionally known as mountain oak and iron oak.[6][7]
- ^ Beckman, E. (2016). "Quercus douglasii". IUCN Red List of Threatened Species. 2016: e.T78914533A78914539. doi:10.2305/IUCN.UK.2016-1.RLTS.T78914533A78914539.en. Retrieved November 12, 2021.
- ^ Wyly, Zarah (February 8, 2019). "Species Spotlight: Quercus douglasii Hook. & Arn". International Oak Society. Retrieved July 14, 2019.
- ^ "Quercus douglasii". World Checklist of Selected Plant Families. Royal Botanic Gardens, Kew – via The Plant List. Note that this website has been superseded by World Flora Online
- ^ Hogan, C. Michael. "Blue Oak Quercus douglasii". GlobalTwitcher. Archived from the original on May 26, 2013. Retrieved July 14, 2019.
- ^ Fryer, Janet L. (2007). "Quercus douglasii". Fire Effects Information System (FEIS). US Department of Agriculture (USDA), Forest Service (USFS), Rocky Mountain Research Station, Fire Sciences Laboratory.
- ^ McDonald, Philip M. (1990). "Quercus douglasii". In Burns, Russell M.; Honkala, Barbara H. (eds.). Hardwoods. Silvics of North America. Vol. 2. Washington, D.C.: United States Forest Service (USFS), United States Department of Agriculture (USDA) – via Southern Research Station.
- ^ "Quercus douglasii". Calflora. Berkeley, California: The Calflora Database.
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