Quercus garryana
Oregon oak (Quercus garryana )
The Oregon oak (Quercus garryana ), also called Garry Oak, is a deciduous tree of the genus of oaks in the family of book -like. The distribution area is located in North America.
Description
The Oregon oak is a deciduous 15 to rarely 20 meters tall tree with a single trunk or 0.1 to 3 meters tall shrub. The bark is light gray or almost white and flaky. The branches are brown, red or yellowish, 2-4 mm in diameter, densely pubescent or glabrous. The buds are 2-12 mm long, hairy brown or yellowish, ovoid to spindle-shaped, pointed, and glandular or fluffy. The leaves are simple and have a 4 to 10 mm long petiole. The leaf blade is 25 to 120 rare 140 mm long and 15 to 85 millimeters wide, obovate, elliptical or round, both sides three to five lobes emarginate with some deep, with rounded or wedge-shaped rare heart-shaped base and blunt tip. The upper leaf surface is light to dark green and sparsely covered with stellate hairs, the lower surface is light green or yellowish frosting and sparse to dense with 0.1 to 1 millimeter long hair covered. There shall be four to seven pairs of nerves yellowish.
The acorns are available individually or in groups up to three. You are almost sessile or rarely stand at 10 to 20 millimeters long stems. The fruit cup is cup-shaped to hemispherical, 4 to 10 millimeters deep, scaled from 12 to 22 millimeters in diameter and yellowish or reddish brown. The acorns are light brown, oblong to round, 25 to 30 ( rarely over 12 and up to 40 ) mm long and 14 to 20 ( rarely 10 to 22 ) mm in diameter, glabrous or pubescent. The chromosome number is.
Distribution and ecology
The natural range is in British Columbia in Western Canada and in Oregon, Washington and California in the United States. The species grows in dry summer, shielded by offshore mountains of the Pacific winds mountainous areas up to 1200 meters altitude in the boundary area of forest and steppe stony, shallow soil and poor soils. They are often found together with Douglas.
Systematics and history of research
The Oregon oak (Quercus garryana ) is a species in the genus of oaks (Quercus ) in the beech family ( Fagaceae ). The first description was in 1840 by William valid Jackson Hooker.
There are three varieties:
- Quercus garryana var breweri ( Engelmann ) Jepson
- Quercus garryana var garryana
- Quercus garryana var semota Jepson
Use
The Oregon Oak is probably the most economically important oak of the Pacific North America, but it is little used due to the difficult terrain.