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A small deciduous tree, native to the Mediterranean region. It produced the earliest-known form of turpentine, and was used in medicine by the ancient Greeks.

Terebinth Tree

A small deciduous tree, native to the Mediterranean region. It produced the earliest-known form of turpentine,…

Pictured is a tree with an unattractive bushy top and bad stumps. The stumps will decay instead of healing.

Unattractive Tree

Pictured is a tree with an unattractive bushy top and bad stumps. The stumps will decay instead of healing.

"These animals are generally called <em>Tree-corals</em>, on account of the forms of the polypidons which they build and in which they live. They are very small, and possess twelve short tentacles placed in a circle around the mouth; they occupy the cells in the polypidom, which is of a porus nature, the openings of the cells being placed at the summits of tubercular prominences of greater or lesser elevations. " &mdash; Goodrich, 1859

Tree-coral

"These animals are generally called Tree-corals, on account of the forms of the polypidons…

Illustrated in the effect of trees on a city street compared with no trees.

Trees on a City Street

Illustrated in the effect of trees on a city street compared with no trees.

Broken trees, the result of crotches.

Broken Trees

Broken trees, the result of crotches.

Triangle diagram for measuring heights of trees using proportions.

Using Proportions To Find Heights of Trees

Triangle diagram for measuring heights of trees using proportions.

Triangle diagram for measuring heights of trees using proportions

Using Proportions To Find Heights of Trees

Triangle diagram for measuring heights of trees using proportions

An illustration of a triangle comprised of a tree and two lines. This is an example of a problem that can be used to fine the distance of an inaccessible object without measuring elevation and whether on a horizontal plane or not.

Triangle with Tree

An illustration of a triangle comprised of a tree and two lines. This is an example of a problem that…

Right triangle ABC with angles A, B, C to be used for finding distance across a river. This is a trigonometry problem. Wishing to determine the width of the river, I observed a tree standing directly across on the bank. The angle of elevation of the top of the tree was 32 degrees. At 150 ft. back from this point and in the same direction from the tree the angle of elevation of the top of the tree was 21 degrees. Find the width of the river.

Right Triangle For Finding Distance Across a River

Right triangle ABC with angles A, B, C to be used for finding distance across a river. This is a trigonometry…

Also known as Quercus cerris. A branchlet of a turkey oak with an acorn.

Turkey Oak with an Acorn

Also known as Quercus cerris. A branchlet of a turkey oak with an acorn.

Also known as Quercus cerris. The branch of a Turkey Oak tree, native to southern Europe.

Branch of Turkey Oak

Also known as Quercus cerris. The branch of a Turkey Oak tree, native to southern Europe.

Pictured is the horizontalis variety of <I>Ulmus scabra</I>. It is a weeping tree representing a grotesque horticultural variety.

Horizontalis Variety of Ulmus Scabra

Pictured is the horizontalis variety of Ulmus scabra. It is a weeping tree representing a grotesque…

A branch from an Umbellularia californica tree, native to the forests of California and Oregon.

Branch of Umbellularia Californica

A branch from an Umbellularia californica tree, native to the forests of California and Oregon.

Also known as Magnolia tripetala. The branch of an Umbrella Magnolia tree, native to the southeastern United States in the Appalachian Mountains region.

Branch of Umbrella Magnolia

Also known as Magnolia tripetala. The branch of an Umbrella Magnolia tree, native to the southeastern…

"Flowering branch of the Upas-Tree."-Whitney, 1902

Upas Tree

"Flowering branch of the Upas-Tree."-Whitney, 1902

Also known as Juniperus osteosperma. A small tree native to the southwestern United States.

Branch of Utah Juniper

Also known as Juniperus osteosperma. A small tree native to the southwestern United States.

Also known as Quercus lobata. The branch of a Valley Oak tree, native to California.

Branch of Valley Oak

Also known as Quercus lobata. The branch of a Valley Oak tree, native to California.

A South American palm that produce a seed for the which the plant is named.

Vegetable Ivory

A South American palm that produce a seed for the which the plant is named.

Also known as Pinus virginiana.

Virginia Pine, Pine Cone

Also known as Pinus virginiana.

Walnut, a genus comprising seven or eight species of beautiful trees of the Juglandaceae order.

Walnut

Walnut, a genus comprising seven or eight species of beautiful trees of the Juglandaceae order.

An illustration of warblers eating plant lice in a tree.

Warblers Eating Plant Lice

An illustration of warblers eating plant lice in a tree.

The Washington Elm

Washington Elm

The Washington Elm

Also known as Betula fontinalis. A species of birch native to North America.

Branch of Water Birch

Also known as Betula fontinalis. A species of birch native to North America.

Also known as Hicoria aquatica. The branch of a Water Hickory tree, native to the southeast United States.

Branch of Water Hickory

Also known as Hicoria aquatica. The branch of a Water Hickory tree, native to the southeast United States.

Also known as Quercus nigra. The branch of a Water Oak tree, native to the southeastern United States.

Branch of Water Oak

Also known as Quercus nigra. The branch of a Water Oak tree, native to the southeastern United States.

Also known as Myrica cerifera. A small tree native to North America. It is commonly used for candle-making, as well as a medicinal plant.

Branch of Wax Myrtle

Also known as Myrica cerifera. A small tree native to North America. It is commonly used for candle-making,…

Also known as Juniperus flaccida. A large shrub or small tree native to central and northern Mexico, as well as the extreme southwest of Texas.

Branch of Weeping Juniper

Also known as Juniperus flaccida. A large shrub or small tree native to central and northern Mexico,…

Also known as Tsuga heterophylla. A species of hemlock native to the west coast of North America.

Pine Cone of Western Hemlock

Also known as Tsuga heterophylla. A species of hemlock native to the west coast of North America.

Also known as Juniperus occidentalis. Native to the western United States.

Branch of Western Juniper

Also known as Juniperus occidentalis. Native to the western United States.

Also known as Larix occidentalis. A species of larch native to the mountains of western North America.

Western Larch Pine Cone

Also known as Larix occidentalis. A species of larch native to the mountains of western North America.

Also known as Thuja plicata. An evergreen coniferous tree native to western North America.

Branch of Western Redcedar

Also known as Thuja plicata. An evergreen coniferous tree native to western North America.

Also known as Platanus racemosa. The branch of a Western Sycamore tree, native to California.

Branch of Western Sycamore

Also known as Platanus racemosa. The branch of a Western Sycamore tree, native to California.

Also known as Pinus monticola. A pine cone of the Western White Pine tree.

Pine Cone of Western White Pine

Also known as Pinus monticola. A pine cone of the Western White Pine tree.

Also known as Alnus rhombifoiia. The branch of a White Alder tree, native to western North America.

Branch of White Alder

Also known as Alnus rhombifoiia. The branch of a White Alder tree, native to western North America.

Also known as Abies concolor. Native to the mountains of western North America.

Pine Cone of White Fir

Also known as Abies concolor. Native to the mountains of western North America.

White oak is an ideal shade tree.

White Oak

White oak is an ideal shade tree.

Also known as Quercus alba. The branch of a White Oak tree, native to eastern North America.

Branch of White Oak

Also known as Quercus alba. The branch of a White Oak tree, native to eastern North America.

Also known as Picea glauca. A spruce tree native to the northern half of North America.

White Spruce Pine Cone

Also known as Picea glauca. A spruce tree native to the northern half of North America.

Also known as Juglans cinerea. A species of walnut native to the eastern United States and southeast Canada.

Branch of White Walnut Tree

Also known as Juglans cinerea. A species of walnut native to the eastern United States and southeast…

Also known as Pinus albicaulis. A pine cone from a Whitebark Pine tree.

Pine Cone of Whitebark Pine

Also known as Pinus albicaulis. A pine cone from a Whitebark Pine tree.

An illustration of a willow branch.

Willow Branch

An illustration of a willow branch.

Also known as Quercus phellos. The branch of a Willow Oak tree, native to eastern North America.

Branch of Willow Oak

Also known as Quercus phellos. The branch of a Willow Oak tree, native to eastern North America.

Large willow tree of Eurasia and North Africa having greyish canescent leaves and grey bark

White Willow

Large willow tree of Eurasia and North Africa having greyish canescent leaves and grey bark

Also known as Ulmus alata. The branch of a Winged Elm tree, native to the southern United States.

Branch of Winged Elm

Also known as Ulmus alata. The branch of a Winged Elm tree, native to the southern United States.

A winter scene with a bird in the tree.

Winter Scene

A winter scene with a bird in the tree.

Also known as Hamamelis virginiana. The branch of a Witch Hazel shrub, native to the eastern United States.

Branch of Witch Hazel

Also known as Hamamelis virginiana. The branch of a Witch Hazel shrub, native to the eastern United…

"On the walls near the lantern." — Young, 1901

Woman Leaning on Wall

"On the walls near the lantern." — Young, 1901

A cross-section of wood infested with insects.

Infested Wood

A cross-section of wood infested with insects.

The golden-winged woodpecker is known for burrowing its own holes into live trees to use as a nest.

Golden-Winged Woodpecker

The golden-winged woodpecker is known for burrowing its own holes into live trees to use as a nest.

Chiefly making its habitat in Northern Europe, the great black woodpecker uses its long, sharp bill to bore into trees in search of insects.

Great black Woodpecker

Chiefly making its habitat in Northern Europe, the great black woodpecker uses its long, sharp bill…

Found in Southern Europe, the middle spotted woodpecker has a black coat, with a crimson underside and a red spot on its head.

Middle Spotted Woodpecker

Found in Southern Europe, the middle spotted woodpecker has a black coat, with a crimson underside and…

Also known as Betula lenta. The branch of a Yellow Birch tree, native to eastern North America.

Branch of Yellow Birch

Also known as Betula lenta. The branch of a Yellow Birch tree, native to eastern North America.

Also known as Liriodendron tulipifera. A branch of a Yellow Poplar tree, native throughout North America.

Branch of Yellow Poplar

Also known as Liriodendron tulipifera. A branch of a Yellow Poplar tree, native throughout North America.

"Taxus baccata loaded with male flowers; 1. a male flower; 2. an anther; 3. a female flower; 4. a vertical section of an ovule; 5. a ripe fruit; 6. of a ripe seed, showing the embryo." -Lindley, 1853

European Yew

"Taxus baccata loaded with male flowers; 1. a male flower; 2. an anther; 3. a female flower; 4. a vertical…

"Saxe-Gothea conspicua; 1. male spike; 2. anther; 3. scale of galbulus with ovule; 4. ripe galbulus." -Lindley, 1853

Prince Albert's Yew

"Saxe-Gothea conspicua; 1. male spike; 2. anther; 3. scale of galbulus with ovule; 4. ripe galbulus."…

Also known as Salix taxifolia. The branch of a Yewleaf Willow, native to southern Mexico and the Pacific Coast.

Branch of Yewleaf Willow

Also known as Salix taxifolia. The branch of a Yewleaf Willow, native to southern Mexico and the Pacific…

A branch of Yucca arborescens, a species in the agave family.

Branch of Yucca Arborescens

A branch of Yucca arborescens, a species in the agave family.

The branch of a Yucca faxoniana, a species of perennial shrub native to the southwest United States.

Branch of Yucca Faxoniana

The branch of a Yucca faxoniana, a species of perennial shrub native to the southwest United States.

The branch of a Yucca macrocarpa, a species of agave plant.

Branch of Yucca Macrocarpa

The branch of a Yucca macrocarpa, a species of agave plant.

The branch and fruit of a Yucca mohavensis, a species of plant from the agave family.

Branch of Yucca Mohavensis

The branch and fruit of a Yucca mohavensis, a species of plant from the agave family.