Plantae > Tracheophyta > Magnoliopsida > Fagales > Fagaceae > Quercus > Quercus douglasii

Quercus douglasii (Blue Oak)

Synonyms: Quercus douglasii var. ransomii; Quercus gambelii (heterotypic); Quercus oblongifolia var. brevilobata; Quercus ransomii

Wikipedia Abstract

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. It is occasionally known as mountain oak and iron oak.
View Wikipedia Record: Quercus douglasii

Attributes

Air Quality Improvement [1]  None
Allergen Potential [1]  Medium-High
Carbon Capture [1]  Medium-Low
Screening - Summer [2]  Moderate
Screening - Winter [2]  Porous
Shade Percentage [1]  79 %
Temperature Reduction [1]  Low
Wind Reduction [1]  Medium-Low
Bloom Period [2]  Spring
Drought Tolerance [2]  High
Edible [3]  May be edible. See the Plants For A Future link below for details.
Fire Tolerance [2]  Low
Flower Type [3]  Monoecious
Frost Free Days [2]  5 months
Fruit/Seed Abundance [2]  Medium
Fruit/Seed Begin [2]  Summer
Fruit/Seed End [2]  Fall
Growth Form [2]  Single Stem
Growth Period [2]  Spring
Growth Rate [2]  Slow
Leaf Type [3]  Deciduous
Lifespan [2]  Perennial
Pollinators [3]  Wind
Propagation [2]  Bare Root, Container, Seed
Root Depth [2]  32 inches (81 cm)
Seed Spread Rate [2]  Slow
Seed Vigor [2]  Low
Seeds Per [2]  100 / lb (220 / kg)
Shape/Orientation [2]  Erect
Specific Gravity [4]  0.66
Structure [3]  Tree
Usage [3]  A mulch of the leaves repels slugs, grubs etc, though fresh leaves should not be used as these can inhibit plant growth; Oak galls are excrescences that are sometimes produced in great numbers on the tree and are caused by the activity of the larvae of different insects. The insects live inside these galls, obtaining their nutrient therein. When the insect pupates and leaves, the gall can be used as a rich source of tannin, that can also be used as a dyestuff; The branches have been used to make rims for twined work baskets; The acorn meal has been used to mend cracks in clay pots; The seed cups are used as buttons; Wood - hard, heavy, strong, brittle. It has a strong cross-grain and is difficult to split; Of little commercial value, it is used mainly for fuel;
Vegetative Spread Rate [2]  Slow
Flower Color [2]  Yellow
Foliage Color [2]  Gray-Green
Fruit Color [2]  Brown
Fall Conspicuous [2]  Yes
Fruit Conspicuous [2]  Yes
Height [3]  39 feet (12 m)
Width [1]  30 feet (9.2 m)
Hardiness Zone Minimum [1]  USDA Zone: 8 Low Temperature: 10 F° (-12.2 C°) → 20 F° (-6.7 C°)
Hardiness Zone Maximum [1]  USDA Zone: 11 Low Temperature: 40 F° (4.4 C°) → 50 F° (10 C°)
Light Preference [2]  Full Sun
Soil Acidity [2]  Moderate Acid
Soil Fertility [2]  Infertile
Water Use [1]  Low to Very Low
View Plants For A Future Record : Quercus douglasii

Protected Areas

Name IUCN Category Area acres Location Species Website Climate Land Use
Table Mountain   California, United States      

Predators

Consumers

Parasitized by 
Polycesta californica[7]

Range Map

External References

USDA Plant Profile

NatureServe Explorer

Citations

Attributes / relations provided by
♦ 1i-Tree Species v. 4.0, developed by the USDA Forest Service's Northern Research Station and SUNY-ESF using the Horticopia, Inc. plant database.
♦ 2USDA Plants Database, U. S. Department of Agriculture
♦ 3Plants For A Future licensed under a Creative Commons Attribution 4.0 License
♦ 4Forest Inventory and Analysis DB version 5.1, May 4, 2013, U.S. Forest Service
♦ 5HOSTS - a Database of the World's Lepidopteran Hostplants Gaden S. Robinson, Phillip R. Ackery, Ian J. Kitching, George W. Beccaloni AND Luis M. Hernández
♦ 6Ben-Dov, Y., Miller, D.R. & Gibson, G.A.P. ScaleNet 4 November 2009
♦ 7Jorrit H. Poelen, James D. Simons and Chris J. Mungall. (2014). Global Biotic Interactions: An open infrastructure to share and analyze species-interaction datasets. Ecological Informatics.
Abstract provided by DBpedia licensed under a Creative Commons License
Species taxanomy provided by GBIF Secretariat (2022). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via GBIF.org on 2023-06-13; License: CC BY 4.0