75 illustrations of oak trees including: black oak, bur oak, canyon oak, chestnut oak, chinquapin oak, island oak, pin oak, post oak, red oak, scarlet oak, hinge oak, swamp oak, turkey oak, white oak, willow oak, and yellow oak, as well as examples of acorns and leaves

In this acorn the nut is surrounded by a scaly cup.

Acorn

In this acorn the nut is surrounded by a scaly cup.

Acorn

Acorn

Acorn

The seed or fruit of an oak.

Acorn

The seed or fruit of an oak.

Half of an acorn, cut lengthwise, filled by the very thick cotyledons, the base of which encloses the minute caulicle.

Acorn

Half of an acorn, cut lengthwise, filled by the very thick cotyledons, the base of which encloses the…

Nut (acorn) of the Oak, with its cup or cupule.

Acorn

Nut (acorn) of the Oak, with its cup or cupule.

An acorn from a dicotyledon.

Acorn

An acorn from a dicotyledon.

An illustration of an acorn.

Acorn

An illustration of an acorn.

Here is a representation of the acorn which has germinated. The roots go down while the stalk goes up.

Germinating Acorn

Here is a representation of the acorn which has germinated. The roots go down while the stalk goes up.

This shows the acorn of Bear Oak, Quercus ilicifolia, (Keeler, 1915).

Bear Oak Acorn

This shows the acorn of Bear Oak, Quercus ilicifolia, (Keeler, 1915).

This shows the acorn of Black Jack Oak, Quercus marilandica, (Keeler, 1915).

Black Jack Oak Acorn

This shows the acorn of Black Jack Oak, Quercus marilandica, (Keeler, 1915).

This shows the acorn of Black Oak, Quercus velutina, (Keeler, 1915).

Black Oak Acorn

This shows the acorn of Black Oak, Quercus velutina, (Keeler, 1915).

This shows the acorn of Bur Oak, Quercus macrocarpa, (Keeler, 1915).

Bur Oak Acorn

This shows the acorn of Bur Oak, Quercus macrocarpa, (Keeler, 1915).

This shows the acorn of chestnut Oak, Quercus prinus, (Keeler, 1915).

Chestnut Oak Acorn

This shows the acorn of chestnut Oak, Quercus prinus, (Keeler, 1915).

This shows the acorn of Chinquapin Oak, Quercus prinoides, (Keeler, 1915).

Chinquapin Oak Acorn

This shows the acorn of Chinquapin Oak, Quercus prinoides, (Keeler, 1915).

A cross-section of an acorn.

Cross-section of an acorn

A cross-section of an acorn.

A longitudinal section of an acorn, showing two cotyledons and the embryo.

Longitudinal section of an acorn

A longitudinal section of an acorn, showing two cotyledons and the embryo.

This shows the acorn of Pin Oak, Quercus palustris, (Keeler, 1915).

Pin Oak Acorn

This shows the acorn of Pin Oak, Quercus palustris, (Keeler, 1915).

This shows the acorn of Post Oak, Quercus minor, (Keeler, 1915).

Post Oak Acorn

This shows the acorn of Post Oak, Quercus minor, (Keeler, 1915).

This shows the acorn of Red Oak, Quercus rubra, (Keeler, 1915).

Red Oak Acorn

This shows the acorn of Red Oak, Quercus rubra, (Keeler, 1915).

This shows the acorn of Scarlet Oak, Quercus coccinea, (Keeler, 1915).

Scarlet Oak Acorn

This shows the acorn of Scarlet Oak, Quercus coccinea, (Keeler, 1915).

This shows the acorn of Shingle Oak, Quercus imbricaria, (Keeler, 1915).

Shingle Oak Acorn

This shows the acorn of Shingle Oak, Quercus imbricaria, (Keeler, 1915).

This shows acorns of Spanish Oak, Quercus digitata, (Keeler, 1915).

Spanish Oak Acorn

This shows acorns of Spanish Oak, Quercus digitata, (Keeler, 1915).

This shows the acorn of Swamp White Oak, Quercus platanoides, (Keeler, 1915).

Swamp Oak Acorn

This shows the acorn of Swamp White Oak, Quercus platanoides, (Keeler, 1915).

This shows the acorn of Willow Oak, Quercus phellos, (Keeler, 1915).

Willow Oak Acorn

This shows the acorn of Willow Oak, Quercus phellos, (Keeler, 1915).

This shows the acorn of Yellow Oak, Quercus acuminata, (Keeler, 1915).

Yellow Oak Acorn

This shows the acorn of Yellow Oak, Quercus acuminata, (Keeler, 1915).

Also known as Quercus kelloggii. The branch of a California Black Oak, native to western North America.

Branch of California Black Oak

Also known as Quercus kelloggii. The branch of a California Black Oak, native to western North America.

Also known as Quercus chrysolepis. The branch of a Canyon Live Oak tree, native to the southwestern North America.

Branch of Canyon Live Oak

Also known as Quercus chrysolepis. The branch of a Canyon Live Oak tree, native to the southwestern…

Also known as Quercus agrifolia. The branch of a Coast Live Oak, native to the California Floristic Province.

Branch of Coast Live Oak

Also known as Quercus agrifolia. The branch of a Coast Live Oak, native to the California Floristic…

Also known as Quercus dumosa. The branch of a Coastal Sage Scrub Oak tree, native to Mexico and California.

Branch of Coastal Sage Scrub Oak

Also known as Quercus dumosa. The branch of a Coastal Sage Scrub Oak tree, native to Mexico and California.

Also known as Quercus wislizeni. The branch of an Interior Live Oak tree, native to California.

Branch of Interior Live Oak

Also known as Quercus wislizeni. The branch of an Interior Live Oak tree, native to California.

Also known as Quercus tomentella. The branch of an Island Oak tree, native to the coast of Caifornia.

Branch of Island Oak

Also known as Quercus tomentella. The branch of an Island Oak tree, native to the coast of Caifornia.

The leaf of a mossy-cup oak tree.

Mossy-Cup Oak Leaf

The leaf of a mossy-cup oak tree.

Also known as Quercus ellipsoidalis. The branch of a Northern Pin Oak tree, native to the northern midwest United States.

Branch of Northern Pin Oak

Also known as Quercus ellipsoidalis. The branch of a Northern Pin Oak tree, native to the northern midwest…

Also known as Quercus rubra. The branch of a Northern Red Oak tree, native to northeastern United States.

Branch of Northern Red Oak

Also known as Quercus rubra. The branch of a Northern Red Oak tree, native to northeastern United States.

Oaks are easily recognized by their characteristic leaves and especially by their peculiar fruit, the well-known acorn.

Oak

Oaks are easily recognized by their characteristic leaves and especially by their peculiar fruit, the…

Oak trees grow in many parts of the country.

Oak

Oak trees grow in many parts of the country.

Oak trees grow in many parts of the country.

Oak

Oak trees grow in many parts of the country.

A valuable and well known tree, or its wood.

Oak

A valuable and well known tree, or its wood.

A genus of trees and shrubs widely distributed in the temperate zones of all the continents, but most abundant in North America. They are not common to the tropical regions of South America, Africa, or Australia.

Oak

A genus of trees and shrubs widely distributed in the temperate zones of all the continents, but most…

Oak tree leaf

Oak

Oak tree leaf

An illustration of a large oak tree. Oaks have spirally arranged leaves, with a lobed margin in many species; some have serrated leaves or entire leaves with a smooth margin. The flowers are catkins, produced in spring. The fruit is a nut called an acorn, borne in a cup-like structure known as a cupule; each acorn contains one seed (rarely two or three) and takes 6–18 months to mature, depending on species.

Oak

An illustration of a large oak tree. Oaks have spirally arranged leaves, with a lobed margin in many…

"Acorn and cupule of Quercus Skinneri, natural size; 2. cross section of the acorn, showing the lobed embryo." -Lindley, 1853

Acorn

"Acorn and cupule of Quercus Skinneri, natural size; 2. cross section of the acorn, showing the lobed…

An illustration of an oak branch.

Oak Branch

An illustration of an oak branch.

Eastern Black oak (Quercus velutina), or more commonly known as simply Black Oak is an oak in the red oak (Quercus sect. Lobatae) group of oaks. It is native to eastern North America from southern Ontario south to northern Florida and southern Maine west to northeastern Texas. It is a common tree in the Indiana Dunes and other sandy dunal ecosystems along the southern shores of Lake Michigan. It is most often found in dry well draining upland soils which can be clayey or sandy in nature in most of the rest of its range. In the northern part of its range, black oak is a relatively small tree, reaching a height of 20-25 m (65-80 ft) and a diameter of 90 cm (35 in), but it grows larger in the south and center of its range, where heights of up to 42 m (140 ft) are known. Black Oak is well known to readily hybridize with other members of the red oak (Quercus sect. Lobatae) group of oaks being one parent in at least a dozen different named hybrids. he inner bark of the black oak contains a yellow pigment called quercitron, which was sold commercially in Europe until the 1940s.

Eastern Black Oak Branch

Eastern Black oak (Quercus velutina), or more commonly known as simply Black Oak is an oak in the red…

The male flower

Oak Flowers

The male flower

The female flower

Oak Flowers

The female flower

Female flowers of <em>q</em>, pedunculata

Oak Flowers

Female flowers of q, pedunculata

Male flowers of <em>q</em>, sessiliflora

Oak Flowers

Male flowers of q, sessiliflora

Female flowers of <em>q</em>, sessiliflora, after fertilization

Oak Flowers

Female flowers of q, sessiliflora, after fertilization

The various types of oak leaves: "a. Bur oak, b. Live oak, c. Willow oak, d. White oak." -Foster, 1921

Oak Leaves

The various types of oak leaves: "a. Bur oak, b. Live oak, c. Willow oak, d. White oak." -Foster, 1921

"Leaf arrangement of the oak." -Bergen, 1896

Oak Leaves

"Leaf arrangement of the oak." -Bergen, 1896

Giant oak with man.

Oak tree

Giant oak with man.

Oak Tree

Oak Tree

Oak Tree

Also known as Quercus suber. It is a medium-sized oak tree, and it is the primary source of cork for wine bottle stoppers. It is commonly found in southwest Europe and northwest Africa.

Cork Oak

Also known as Quercus suber. It is a medium-sized oak tree, and it is the primary source of cork for…

Also known as Quercus cerris. A greenish-white tree with a dark gray bark. The flower produced is a cylindrical cluster of yellow flowers, which are usually wind-pollinated. The fruit is a large acorn, which is bicoloured with an orange bottom half grading to a green-brown tip.

Turkey Oak

Also known as Quercus cerris. A greenish-white tree with a dark gray bark. The flower produced is a…

White oak is the common name of <i>quercus alba</i>.

White Oak

White oak is the common name of quercus alba.

An oak seedling.

Oak-seedling

An oak seedling.

The leaf of a pin-oak tree.

Pin-Oak Leaf

The leaf of a pin-oak tree.

The branch of a Quercus acuminata tree, a species of oak tree.

Branch of Quercus Acuminata

The branch of a Quercus acuminata tree, a species of oak tree.

The branch of a Quercus brevifolia, a species of oak tree.

Branch of Quercus Brevifolia

The branch of a Quercus brevifolia, a species of oak tree.