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]
Blue Oak - US Forest Service
网页Blue Oak (Quercus douglasii Hook. & Arn.) By Forest Gauna. 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. Blue oak is endemic to California.
Blue Oak - US Forest Service Research and Development
网页Acorns of blue oak are critical to migrating deer who leave a dried-up summer range in the Sierra Nevada and travel to a winter range at lower elevations. Acorns picked up en route provide energy and protein not only for travel, but also help to ensure healthy animals during the breeding season.
38 Types of Acorns (With Pictures) - Visual Identification Guide
网页2023年10月9日 · Acorns from the blue oak tree have a distinct egg shape that tapers to a narrow point. The conical acorns mature from green to a dark brown, almost black. These sweet brown acorns grow 0.8” to 1.2” (20 – 30 mm) long, and the cupule is …
Nature's Notebook: Blue Oak
网页This species is monoecious, having male and female flowers separate but on the same plant. Male flowers are yellow green hanging catkins, and female flowers are small and solitary, growing in the axis of leaves. The flowers are wind pollinated. The acorns are 2 to 3 centimeters long and take a year to mature.
Bur Oak - US Forest Service Research and Development
网页Bur oak (Quercus macrocarpa), also known as blue oak, mossy-overcup oak, mossy-overcup oak, and scrub oak, has the largest acorns of all native oaks and is very drought resistant. It grows slowly on dry uplands and sandy plains but is also found on fertile limestone soils and moist bottomlands in mixture with other hardwoods.
Species Spotlight: Quercus douglasii Hook. & Arn.
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.
网页The most significant use of blue oak was for its highly desirable acorns for food. Acorns were shelled, dried, pounded into flour, sifted for fineness, leached of bitter tannins, and mixed with other acorn types such as black oak (Quercus kelloggii) and prepared as mush, soup, paddies, or bread.
How to Grow California Oaks - UC Oaks
网页Blue oak acorns are especially prone to this. The white tip emerging from the pointed end of the acorn is actually the start of the new root system. Once these roots have grown for a few weeks, they can start to go bad and turn dark brown or grey and mushy.
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.