Blue Oak - US Forest Service
网页Blue oak is named for the bluish cast of the leaves; a stand of blue oak trees from a distance has a “cool,” relaxing blue-grey tinge, which is a welcome sight in the hot summer sun of the California foothills.
Quercus douglasii - Wikipedia
网页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]
Quercus douglasii Hook - US Forest Service Research and …
网页Blue oak flowers from late March to mid-May, depending on elevation, aspect, climate, and reproductive capability of individual trees. In general, trees at lower elevations and on warmer aspects bloom first.
Quercus douglasii (Blue Oak) - Gardenia
网页Quercus douglasii (Blue Oak) is a medium-sized deciduous tree with a short trunk and a broad, rounded crown. The stout crooked branches are clothed with oval, shallowly lobed, bluish-green leaves, up to 4 in. long (10 cm). The foliage turns attractive pastel shades of pink, orange and yellow in the fall.
Species Spotlight: Quercus douglasii Hook. & Arn. | International Oak …
网页2019年2月8日 · Quercus douglasii is an endemic California oak tree, affectionately called “the blue oak” due to its distinctive blueish-green leaf color. It is common throughout California and known for growing in locations that create a bathtub ring around California’s great Central Valley.
Quercus douglasii Hook. & Arn. - Calflora
网页Quercus douglasii is a tree that is native to California, and endemic (limited) to California.
Blue Oak - Calscape
网页The majestic blue oak is a drought-tolerant deciduous tree that provides food and shelter for local wildlife. It supports birds, squirrels and insects. It is a host plant for several species of butterflies and moths. This tree gets its name from its blue-green leaves. The bark is pale gray and textured.
网页General: Oak Family (Fagaceae). Blue oak is a deciduous tree that is endemic to California. It has a rounded crown and grows from 6-20 m. high. The gray bark is shallowly checked into small thin scales. The leaves are shallowly lobed and blue-green above.
Quercus douglasii Blue Oak PFAF Plant Database
网页Main Bloom Time: Early spring, Late spring, Mid spring. Form: Rounded, Spreading or horizontal. Quercus douglasii is a deciduous Tree growing to 12 m (39ft 4in) at a slow rate. See above for USDA hardiness. It is hardy to UK zone 7 and is not frost tender. It is in flower in May, and the seeds ripen in October.
Nature's Notebook: Blue Oak
网页This deciduous tree is short and straight, growing from 6 to 20 meters tall with thin and flaky light grey bark. The waxy bluish-green leaves are 3 to 8 centimeters long with wavy margins. This species is monoecious, having male and female flowers separate but on …