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Quercus douglasii Hook. & Arn.
BLUE OAK
Life   Plantae   Dicotyledoneae   Fagaceae   Quercus

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Quercus douglasii
© Copyright New York Botanical Garden, 2013 · -7
Quercus douglasii

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Associates · map
FamilyScientific name @ source (records)
Aphididae  Euceraphis punctipennis @ AMNH_PBI (2)

Myzocallis @ AMNH_PBI (3)

Neosymydobius agrifoliae @ CSCA_TCN (3)

Stegophylla essigi @ AMNH_PBI (1)

Stegophylla quercicola @ CSCA_TCN (1)

Thelaxes californica @ CSCA_TCN (3)

Tuberculatus ( @ CSCA_TCN (10)

Tuberculatus @ CSCA_TCN (4)
Asterolecaniidae  Asterodiaspis minor @ CSCA_TCN (2)
Botryosphaeriaceae  Phyllosticta livida @ BPI (6)
Cronartiaceae  Cronartium californicum @ BPI (8)

Cronartium cerebrum @ BPI (3)

Cronartium conigenum @ BPI (2)

Cronartium fusiforme @ BPI (2)

Cronartium meineckii @ BPI (10)

Cronartium pyriforme @ BPI (1)

Cronartium strobilinum @ BPI (14)
Diaspididae  Quernaspis quercus @ CSCA_TCN (5)
Didymosphaeriaceae  Asteromella livida @ BPI (1)
Eriococcidae  Eriococcus quercus @ CSCA_TCN (1)
Kermesidae  Allokermes galliformis @ CSCA_TCN (2)

Kermes cockerelli @ CSCA_TCN (2)

Kermes rimarum @ CSCA_TCN (4)
Margarodidae  Kuwania quercus @ CSCA_TCN (21)
Miridae  Ceratopsallus aquilonius @ AMNH_PBI (19)

Ceratopsallus pantherinus @ AMNH_PBI (2)

Crassomiris anaticula @ AMNH_PBI (13)

Crassomiris fatisco @ AMNH_PBI (61)

Dacerla alata @ AMNH_ENT (1)

Irbisia solani @ AMNH_PBI (1)

Oligotylus carneatus @ AMNH_PBI (2)

Orthotylus n @ AMNH_PBI (5)

Phytocoris fuscosignatus @ AMNH_PBI (4)

Plagiognathus verticalis @ AMNH_ENT (1)

Pseudatomoscelis seriatus @ AMNH_ENT (1)

Pygovepres vaccinicola @ AMNH_PBI (631)

Quernocoris caliginosus @ AMNH_PBI (14)

Rubellomiris mariposa @ AMNH_PBI (5)

Tuxedo bicinctus @ AMNH_PBI (6)

Tuxedo susansolomonae @ AMNH_PBI (1)
Mymaridae  Alaptus @ UCRC_ENT (2)
Polyporaceae  Polyporus rheades @ BPI (1)
Taphrinaceae  Taphrina caerulescens @ BPI (2)

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http://plants.usda.gov/java/profile?symbol=QUDO ---> https://plants.usda.gov/java/profile?symbol=QUDO
https://plants.usda.gov/java/profile?symbol=QUDO ---> http://plants.usda.gov/core/profile?symbol=QUDO
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You are here: Home / Plant Profile

Quercus douglasii Hook. & Arn.
blue oak

Image of Quercus douglasii

General Information
Symbol: QUDO
Group: Dicot
Family: Fagaceae
Duration: Perennial
Growth Habit : Tree
Native Status : L48   N
Characteristics
Plant Guide (pdf) (doc)
Data Source and Documentation
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Plants-NRCS Logos
green round image for nativity Native blue round image for introduced Introduced ocre round image for introduced and nativity Both white round image for no status Absent/Unreported
image for native, but no county data Native, No County Data image for introduced, but no county data Introduced, No County Data both introduced and native, but no county data Both, No County Data
Native Status:
lower 48 status L48    Alaska status AK    Hawaii status HI    Puerto Rico status PR    Virgin Islands status VI    Navassa Island NAV    Canada status CAN    Greenland status GL    Saint Pierre and Michelon status SPM    North America NA   

Images

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©G.A. Cooper. Provided by Smithsonian Institution, Department of Botany . United States, CA, Wrightwood vicinity, E. of town. Usage Requirements .

©Mark W. Skinner. United States, CA, Sutter Co., Sutter Buttes. April 4, 1990. Usage Requirements .

©Mark W. Skinner. United States, CA, Sutter Co., Sutter Buttes. April 4, 1990. Usage Requirements .

©Mark W. Skinner. United States, CA, Sutter Co., Sutter Buttes. April 4, 1990. Usage Requirements .

Leland J. Prater. Provided by National Agricultural Library . Originally from USDA Forest Service . United States, CA. 1965. Usage Requirements .

G.B. Sudworth. Provided by National Agricultural Library . Originally from USDA Forest Service . United States, CA. 1899. Usage Requirements .

©Mark W. Skinner. United States, CA, Solano Co. March 26, 1992. Usage Requirements .

©Mark W. Skinner. United States, CA, Solano Co. March 26, 1992. Usage Requirements .

©Mark W. Skinner. United States, CA, Solano Co. March 26, 1992. Usage Requirements .

©Mark W. Skinner. United States, CA, Kern Co., Keene. April 16, 1992. Usage Requirements .

©Mark W. Skinner. United States, CA, Yolo Co., Road 81. March 16, 1995. Usage Requirements .

©Mark W. Skinner. United States, CA, Yolo Co., Road 81. March 16, 1995. Usage Requirements .

©Mark W. Skinner. United States, CA, Yolo Co., Road 81. March 16, 1995. Usage Requirements .

©Mark W. Skinner. United States, CA, Yolo Co., Road 81. March 16, 1995. Usage Requirements .

©Mark W. Skinner. United States, CA, Yolo Co., Road 81. March 16, 1995. Usage Requirements .

©Mark W. Skinner. United States, CA, Yolo Co., Road 81. March 16, 1995. Usage Requirements .

©Mark W. Skinner. United States, CA, Yolo Co., Road 81. March 16, 1995. Usage Requirements .

©Mark W. Skinner. United States, CA, Yolo Co., Road 81. March 16, 1995. Usage Requirements .

©Mark W. Skinner. United States, CA, Yolo Co., Road 81. March 16, 1995. Usage Requirements .

©Mark W. Skinner. United States, CA, Yolo Co., Road 81. March 16, 1995. Usage Requirements .

©Mark W. Skinner. United States, CA, Yolo Co., Road 81. March 16, 1995. Usage Requirements .

©Mark W. Skinner. United States, CA, Yolo Co., Road 81. March 16, 1995. Usage Requirements .

©Mark W. Skinner. United States, CA, Yolo Co., Road 81. March 16, 1995. Usage Requirements .

©Mark W. Skinner. United States, CA, San Luis Obispo Co., Shell Creek. April 4, 1995. Usage Requirements .

©Mark W. Skinner. United States, CA, Merced Co., Flying M Ranch. April 16, 1995. Usage Requirements .

©Mark W. Skinner. United States, CA, Tehama Co., Hog Lake. April 30, 1996. Usage Requirements .

©Mark W. Skinner. United States, CA, Tehama Co., Hog Lake. April 30, 1996. Usage Requirements .

©Mark W. Skinner. United States, CA, Tehama Co., Hog Lake. April 30, 1996. Usage Requirements .

©Mark W. Skinner. United States, CA, Tehama Co., Hog Lake. April 30, 1996. Usage Requirements .

©Mark W. Skinner. United States, CA, Tehama Co., Hog Lake. April 30, 1996. Usage Requirements .

©Mark W. Skinner. United States, CA, Tehama Co., Hog Lake. April 30, 1996. Usage Requirements .

©Mark W. Skinner. United States, CA, Tehama Co., Hog Lake. April 30, 1996. Usage Requirements .

©Mark W. Skinner. United States, CA, Napa Co., Carneros. May 13, 1996. Usage Requirements .

©Mark W. Skinner. United States, CA, Napa Co., Carneros. May 13, 1996. Usage Requirements .

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Synonyms

Classification

Click on a scientific name below to expand it in the PLANTS Classification Report.
Rank Scientific Name and Common Name
Kingdom Plantae – Plants
Subkingdom Tracheobionta – Vascular plants
Superdivision Spermatophyta – Seed plants
Division Magnoliophyta – Flowering plants
Class Magnoliopsida – Dicotyledons
Subclass Hamamelididae
Order Fagales
Family Fagaceae – Beech family
Genus Quercus L. – oak
Species Quercus douglasii Hook. & Arn. – blue oak

Subordinate Taxa

This plant has no children

Legal Status

Wetland Status

Interpreting Wetland Status

Related Links

More Accounts and Images
ARS Germplasm Resources Information Network (QUDO)
CalPhotos (QUDO)
Flora of North America (QUDO)
Integrated Taxonomic Information System (QUDO)
Jepson Interchange (University of California - Berkeley) (QUDO)
Lady Bird Johnson Wildflower Center Native Plant Information Network (QUDO)
Native American Ethnobotany (University of Michigan - Dearborn) (QUDO)
Native Plants Network (QUDO)
USDA Forest Service Fire Effects Information System (QUDO)
Related Websites
CA-California Oak Mortality Task Force (QUDO)
USDA Forest Service-Silvics of North America (QUDO)

Wildlife

Food

Source Large Mammals Small Mammals Water Birds Terrestrial Birds

Cover

Source Large Mammals Small Mammals Water Birds Terrestrial Birds

Description of Values

Value Class Food Cover


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63. Quercus douglasii Hooker & Arnott, Bot. Beechey Voy. 9: 391. 1840.

Blue oak

Quercus douglasii var. ransomii (Kellogg) Beissner; Q . ransomii Kellogg

Trees , deciduous, with single trunks, sometimes with few to several trunks. Bark gray, scaly. Twigs reddish or yellowish, ca. 2 mm, densely or sparsely puberulent, occasionally glabrate with age. Buds reddish brown, rarely yellowish, broadly ovoid to rarely subglobose, (2-)3-5 mm; scales glabrous except for ciliate margins, sometimes sparsely or densely pubescent. Leaves: petiole blue-green, 2-6 mm. Leaf blade obovate or elliptic, oblong or oblanceolate, (20-)40-60(-80) × (15-)20-30(-40) mm, base rounded-attenuate or rounded, rarely cuneate, margins shallowly lobed or irregularly toothed, sometimes entire, lobes mucronate or rounded, secondary veins 6-10 on each side, apex rounded, rarely moderately acute; surfaces abaxially light green or blue-green, waxy, with scattered to crowded, semi-erect, (2-)4-6(-8)-rayed stellate hairs usually 0.2-0.6 mm diam. or larger, adaxially blue-green, glaucous or grayish, vestiture similar to abaxial surface. Acorns subsessile, solitary; cup hemispheric or cup-shaped, rarely deeper, 5-10 mm deep × 10-15 mm wide, enclosing only base of nut, scales thin and not tuberculate to strongly and irregularly tuberculate, particularly toward base of cup; nut thin-walled, fusiform or subcylindric, 20-30 × 10-16 mm. Cotyledons distinct. 2 n = 24.

Flowering late winter-spring. Oak woodlands, margins of chaparral and grasslands; 0-1200 m; Calif.

Populations of Quercus douglasii in coastal southern California and on the Channel Islands consist of small stands or solitary individuals often associated with Q . lobata and scrub oaks. Some doubt exists as to whether some or all of those populations are natural stands or are historical introductions near Native American settlements. Along the canyons of Santa Barbara County, putative hybrids between Q . douglasii and Q . dumosa are referred to Q . × kinselae (C. H. Muller) Nixon. In the interior Coast Ranges of California are found numerous populations that are intermediate in form between Q . douglasii and Q . john-tuckeri (= Q . turbinella var. californica ). This appears to be an area of secondary contact, and the two species remain distinct in nearby populations. Because of the widespread nature of the intermediates, following Tucker's extensive studies they can be conveniently referred to as the nothospecies Q . × alvordiana Eastwood. The plants tend to be shrubs to small trees, with somewhat more spinose leaves than Q . douglasii and fruit similar to those of the latter species.

Updated: 2020-05-28 13:00:16 gmt
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