Fagaceae
Blue oak
Quercus douglasii
- Family
- Fagaceae
- Genus
- Quercus
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Common names
By language (8)
- Arabic
- سنديان دوغلاسي
- arz
- سنديان دوغلاسى
- Chinese
- 蓝橡树, 藍橡樹
- Czech
- Dub modrý
- English
- Blue oak, Iron oak, Mountain oak
- Georgian
- Ლურჯი მუხა
- German
- Blau-Eiche
- Japanese
- ブルー・オーク
Synonyms
- Quercus douglasii var. ransomii Zabel
- Quercus gambelii Liebm.
- Quercus oblongifolia var. brevilobata Torr.
- Quercus ransomii Kellogg
Flowers
- Flower colour
- yellow (USDA PLANTS Database)
Characteristics
- Growth habit
- Tree
- Lifespan
- Perennial
- In the US and Canada
- Lower 48 states: native
Photos
LeavesPhoto: Jonas Katona, CC BY 4.0, from iNaturalist 
Photo: Yath at English Wikipedia, CC BY-SA 3.0, from Wikimedia Commons 
Photo: John Rusk from Berkeley, CA, United States of America, CC BY 2.0, from Wikimedia Commons 
Photo: John Rusk from Berkeley, CA, United States of America, CC BY 2.0, from Wikimedia Commons 
Photo: John Rusk from Berkeley, CA, United States of America, CC BY 2.0, from Wikimedia Commons 
Photo: John Rusk from Berkeley, CA, United States of America, CC BY 2.0, from Wikimedia Commons
More in Quercus
- Pedunculate oakQuercus roburFagaceae
- Cork oakQuercus suberFagaceae
- Sessile oakQuercus petraeaFagaceae
- Holm oakQuercus ilexFagaceae
- European turkey oakQuercus cerrisFagaceae
- Northern red oakQuercus rubraFagaceae
- Downy oakQuercus pubescensFagaceae
- Kermes oakQuercus cocciferaFagaceae
- Pin oakQuercus palustrisFagaceae
- White oakQuercus albaFagaceae
- Hungarian oakQuercus frainettoFagaceae
- Daimyo oakQuercus dentataFagaceae
Sources: classification, synonyms from World Flora Online Plant List (2026-06, CC0 1.0); common names, popularity from Wikidata (2026-10-26, CC0 1.0); common names, US characteristics from USDA PLANTS Database (2025-05-29, CC0 1.0). About our plant data.