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Las Trampas Regional Wilderness
Marin County Complete List (CNPS)
Marin Municipal Water District
McLaughlin Reserve (NRDB.org)
Millerton Lake State Recreation Area
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Monte Bello OSP (NRDB.org)
Morgan Territory Regional Preserve
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Mount Diablo SP (NRDB.org)
Oat Hill Mine
Ohlone Regional Wilderness
Olompali State Historic Park
Pearson-Arastradero Preserve
Pfeiffer Big Sur SP (NRDB.org)
Pinnacles National Park
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Rancho Canada del Oro OSP (NRDB.org)
Round Valley Regional Preserve
Rush Creek
Santa Teresa CP (NRDB.org)
Shadow Cliffs Regional Recreation Area
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Stafford Lake
Stevens Creek CP (NRDB.org)
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Sugarloaf Ridge SP (NRDB.org)
Sunol Regional Wilderness
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Ulistac Natural Area (NRDB.org)
Van Hoosear Wildflower Preserve
Vasco Caves Regional Preserve
Wassama Round House State Historic Park
Windy Hill OSP (NRDB.org)
Yosemite National Park
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Blue Oak (Quercus douglasii)
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Broadleaf Tree
Yellow
Other
Petals Not Obvious
Alternate
Typical Height
Deciduous
Has Catkins
CA Endemic
Description
Height 20 - 65 ft.
EW Bloom Mar - May
Blue-green leaves with wavy edges, plus corn flake bark, are quick way to identify this oak.
Leaves are relatively small and sparse, allowing it to tolerate more sun and dryer places than other California
deciduous
oaks.
CA native. Found only in California.
Beech Family (Fagaceae)
Leathery blue-green leaves often have shallow
lobes
. They have a short
petiole
(stalk) and are generally 2 - 3 inches long.
Bark is pale and checkered by medium-size cracks. It reminds me of corn flakes.
This moderately sized oak has a heavy trunk and branches. It's common in dry, hot places that have some water.
Photo Gallery (69 ) click any picture to enlarge
Blue Oak has been called the "hallmark species" of the dry, open foothills that surround the Central Valley. Its root system works well in dry, roc ...
Blue Oak has a round canopy, with many crooked branches. The spherical brushy places in the tree are mistletoe.
Blue Oak leaves are thick. Their edges are wavy or shallowly [[lobed]], and do not have bristles. They grow 1 to 3 inches long. Their top surface ...
The underside of a leaf has short downy hairs, which help collect and retain moisture.
Blue Oak hosts a variety of gall insects. Insects deposit larvae on a stem or leaf of the tree. Either the insect or the larva (varying by species ...