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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 agrifolia, the California live oak, [3] or coast live oak, is an evergreen [4] live oak native to the California Floristic Province.Live oaks are so-called because they keep living leaves on the tree all year, adding young leaves and shedding dead leaves simultaneously rather than dropping dead leaves en masse in the autumn like a true deciduous tree. [5]
Deciduous trees experience much less branch and trunk breakage from glaze ice storms when leafless, and plants can reduce water loss due to the reduction in availability of liquid water during cold winter days. [16] Losing leaves in winter may reduce damage from insects; repairing leaves and keeping them functional may be more costly than just ...
The leaves are variable, being 15–25 mm (5 ⁄ 8 –1 in) long and flat on young trees and shaded lower branches in older trees. The leaves are scalelike, 5–10 mm ( 1 ⁄ 4 – 3 ⁄ 8 in) long on shoots in full sun in the upper crown of older trees, with a full range of transition between the two extremes.
The "Henley Oak", in Covelo, California, is the tallest known valley oak, at 47 m (153 ft). [7] [8] The branches have an irregular, spreading and arching appearance. During autumn, the leaves turn a yellow to light orange color but become brown later in the season. In advancing age, the branches droop. The trees have pewter-colored rippled bark ...
But unlike herbaceous perennials, these woody plants keep their above-ground infrastructure in place for the winter. The loss of foliage is an adaptation to reduce water loss through the winter.
The leaves are green, and lighter on the underside. [8] The bark and leaves have a pungent scent resembling camphor when bruised, [8] due to a chemical known as umbellulone. [6] The leaves are entire and lance-shaped about 3–10 centimetres (1.2–3.9 in) long. They may substitute for the Mediterranean bay leaf in cooking.
Calocedrus decurrens is a large tree, typically reaching heights of 30–40 meters (100–130 ft) and a trunk diameter up to 1.2 m (3 ft 11 in). The largest known tree, located in Klamath National Forest, Siskiyou County, California, is 47.98 m (157 ft 5 in) tall with a 12 m (39 ft 4 in) circumference trunk and a 17.5 m (57 + 1 ⁄ 2 ft) spread. [8]