''Quercus'' × ''macdonaldii'',Jepson: ''Quercus'' × ''macdonaldii''
Retrieved 28 February 2015.USDA: ''Quercus'' × ''macdonaldii''
Retrieved 28 February 2015. formerly ''Quercus macdonaldii'', with the common names MacDonald's oak and Macdonald oak, is a rare hybrid species of

oak An oak is a hardwood tree or shrub in the genus ''Quercus'' of the beech family. They have spirally arranged leaves, often with lobed edges, and a nut called an acorn, borne within a cup. The genus is widely distributed in the Northern Hemisp ...

in the family

Fagaceae The Fagaceae (; ) are a family of flowering plants that includes beeches, chestnuts and oaks, and comprises eight genera with around 1,000 or more species. Fagaceae in temperate regions are mostly deciduous, whereas in the tropics, many species ...

Description

The tree is between 5 and 15 meters tall, with scaly bark on the trunk. The twigs are gray and

tomentose Trichomes (; ) are fine outgrowths or appendages on plants, algae, lichens, and certain protists. They are of diverse structure and function. Examples are hairs, glandular hairs, scales, and papillae. A covering of any kind of hair on a plant ...

. The leaves are between 4 and 7 centimeters in length, the blades are oblong to obovate, and adaxially

glabrous Glabrousness () is the technical term for a lack of hair, down, setae, trichomes, or other such covering. A glabrous surface may be a natural characteristic of all or part of a plant or animal, or be due to loss because of a physical condition, ...

to sparsely hairy. The petioles are between 3 and 10 millimeters. The fruits cup is between 10 and 20 millimeters long and 6 to 10 millimeters deep. The nuts are between 20 and 35 millimeters long and

conic A conic section, conic or a quadratic curve is a curve obtained from a cone's surface intersecting a plane. The three types of conic section are the hyperbola, the parabola, and the ellipse; the circle is a special case of the ellipse, thou ...

oblong An oblong is an object longer than it is wide, especially a non-square rectangle. Oblong may also refer to: Places * Oblong, Illinois, a village in the United States * Oblong Township, Crawford County, Illinois, United States * A strip of land ...

ovoid An oval () is a closed curve in a plane which resembles the outline of an egg. The term is not very specific, but in some areas of mathematics (projective geometry, technical drawing, etc.), it is given a more precise definition, which may inc ...

. The flowering time is between the months of March and May.

Distribution

The tree is

endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

to the California

Channel Islands The Channel Islands are an archipelago in the English Channel, off the French coast of Normandy. They are divided into two Crown Dependencies: the Jersey, Bailiwick of Jersey, which is the largest of the islands; and the Bailiwick of Guernsey, ...

, on

Santa Cruz Island Santa Cruz Island (Spanish language, Spanish: ''Isla Santa Cruz'', Chumashan languages, Chumash: ''Limuw'') is located off the southwestern coast of Ventura, California, United States. It is the largest island in California and largest of the ei ...

, Santa Rosa Island, and Santa Catalina Island, in

Southern California Southern California (commonly shortened to SoCal) is a geographic and Cultural area, cultural List of regions of California, region that generally comprises the southern portion of the U.S. state of California. Its densely populated coastal reg ...

. It is found in chaparral and woodlands

habitat In ecology, habitat refers to the array of resources, biotic factors that are present in an area, such as to support the survival and reproduction of a particular species. A species' habitat can be seen as the physical manifestation of its ...

s in canyons and slopes below .

Taxonomy

The plant was reclassified as ''Quercus'' × ''macdonaldii'', a naturally occurring hybrid of ''

Quercus lobata ''Quercus lobata'', commonly called the valley oak or roble, is the largest of the California oaks. It is endemic to the state, growing in interior valleys and foothills from Siskiyou to San Diego counties. Deciduous, it requires year-round grou ...

'' and ''

Quercus pacifica ''Quercus pacifica'' is a species of oak known by the common names island scrub oak, Channel Island scrub oak, and Pacific oak. Description ''Quercus pacifica'' is a shrub or a small tree growing up to in height, or occasionally taller. The le ...

'', or possibly other oak species. Both parents are placed in section ''Quercus''. It is considered a species by Greene but derived from hybrids involving ''

'', ''

,'' and possibly others.

References

External links

Jepson eFlora treatment of ''Quercus'' × ''macdonaldii''

USDA Plants Profile for ''Quercus'' × ''macdonaldii'' [berberidifolia × lobata] (MacDonald oak)

Calflora Database: ''Quercus × macdonaldii'' (MacDonald's oak, MacDonald oak)
macdonaldii Endemic flora of California Natural history of the Channel Islands of California Natural history of the California chaparral and woodlands Natural history of Los Angeles County, California Trees of Northern America Hybrid plants Taxonomy articles created by Polbot {{Quercus-stub

Description

Distribution

Taxonomy

See also

References

External links