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Also known as Rhus vernix. It is a woody shrub or small trees that can cause skin irritation when touched. When burned, inhalation of the smoke may cause a rash to appear on the lungs.

Poison Sumac

Also known as Rhus vernix. It is a woody shrub or small trees that can cause skin irritation when touched.…

"By the time [olive trees] are well grown the form of the young tree is established, and further pruning for form may be done in a general manner to obtain the following results: (1) Maintenance of a comparatively open center to the tree; (2) exposure to the sun and air as large a number as possible of last year's branches around the circumference of the tree; (3) removal of all ground suckers and water sprouts; (4) preservation of outward-growing and drooping basal and lateral fruit branches; (5) heading back of upward-growing limbs, which consume much, but produce little; and, (6) the removal of all diseased or injured wood. In pruning for form the rules governing pruning for fruit should be kept in mind."—Government Printing Office, 1897

An Olive Tree

"By the time [olive trees] are well grown the form of the young tree is established, and further pruning…

Olive branches in fruit, showing a self-sterile and a self-fertile variety.

Olive Branches in Fruit

Olive branches in fruit, showing a self-sterile and a self-fertile variety.

Also known as Pinus brutia. It is a medium-sized tree, with an orange-red thick bark and a thin upper crown. It is widely planted for timber purposes.

Turkish Pine

Also known as Pinus brutia. It is a medium-sized tree, with an orange-red thick bark and a thin upper…

Also known as Pinus sabiniana and Digger Pine. This image depicts the cone of the tree, which is generally flaccid, slightly twisted, and rounded on the outer side with a prominent rib on the inner side.

Gray Pine

Also known as Pinus sabiniana and Digger Pine. This image depicts the cone of the tree, which is generally…

Also known as Pinus strobus. It is light green with silvery lines. The branches are generally around 3 inches to 5 inches in length. The cones are cylindrical, between 6 inches and 8 inches long, with smooth scales and a thick apex.

Eastern White Pine Branchlet

Also known as Pinus strobus. It is light green with silvery lines. The branches are generally around…

Also known as Pinus sylvestris. The cones of this tree have a dense hue, and are between 1.5 inches to 2 inches in length.

Cone of the Scots Pine

Also known as Pinus sylvestris. The cones of this tree have a dense hue, and are between 1.5 inches…

Also known as Pinus sylvestris fastigiata. This tree is nearly identical to a regular Scots Pine, only that it is in the shape of a column.

Columnar Scots Pine

Also known as Pinus sylvestris fastigiata. This tree is nearly identical to a regular Scots Pine, only…

A branch of Piper porphyrophyllum. It is generally between 4 and 6 inches in length and consists of rich bronzy-green leaves.

Piper Porphyrophyllum

A branch of Piper porphyrophyllum. It is generally between 4 and 6 inches in length and consists of…

The image depicts the flower and portion of a leaf of the Pitcairnia andreana. The petals are yellow at the tip with red at the bottom.

Pitcairnia Andreana

The image depicts the flower and portion of a leaf of the Pitcairnia andreana. The petals are yellow…

A diagram consisting of a section of a span-roofed pit. These pits are useful for plant culture. A, Ordinary Soil; b, Passage; c, Heated Chambers; d, Plunging Beds; e, Hot-Water Pipes.

Section of Span-Roofed Pit

A diagram consisting of a section of a span-roofed pit. These pits are useful for plant culture. A,…

An image of a fruiting plum branch.

Fruiting Branch of Plum

An image of a fruiting plum branch.

A round, medium-sized fruit that is yellowish-green and covered with faint crimson spots. It is known for being one of the richest-flavored of all plums.

Fruiting Branch of Green Gage Plum

A round, medium-sized fruit that is yellowish-green and covered with faint crimson spots. It is known…

Also known as Punica granatum. The trees on which these fruits are born range between 15 feet and 20 feet in height. They are mostly native to the Iranian Plateau.

Pomegranate

Also known as Punica granatum. The trees on which these fruits are born range between 15 feet and 20…

Also known as Populus alba canescens. A species of poplar, commonly found in Spain, Morocco, and central Europe and Asia. The bark is smooth and approximately 3 feet in width. The trees generally grow between 52 and 88 feet.

White Poplar

Also known as Populus alba canescens. A species of poplar, commonly found in Spain, Morocco, and central…

Also known as Populus tremula. A medium-sized tree growing up to 10-25 meters tall.

Aspen

Also known as Populus tremula. A medium-sized tree growing up to 10-25 meters tall.

A rubber tree common to India, used to derive Assam rubber.

Ficus Elastica

A rubber tree common to India, used to derive Assam rubber.

Known as a weeping fig, commonly seen in stores as ficus. This tree is native to southern and southeastern Asia and Australia.

Ficus Benjamina

Known as a weeping fig, commonly seen in stores as ficus. This tree is native to southern and southeastern…

A moraceous tree belonging to the Ficus of tropical regions, producing pear like fruit.

Fig Tree

A moraceous tree belonging to the Ficus of tropical regions, producing pear like fruit.

A type of palm tree that grows between 2 feet and 10 feet in length, and up to 60 feet in height. They are commonly found in Queensland and New South Wales, and are used in conservatories and greenhouses.

Ptychosperma Cunninghamiana

A type of palm tree that grows between 2 feet and 10 feet in length, and up to 60 feet in height. They…

A birch-leaved tree with brownish fronds dotted with white. They tend to reach about 22 feet in height, and produce inedible brown fruits.

Pyrus Betulaefolia

A birch-leaved tree with brownish fronds dotted with white. They tend to reach about 22 feet in height,…

A free-flowering tree that grows beautiful red flowers. They are commonly found in Japan, and tend to bloom in May.

Pyrus Floribunda

A free-flowering tree that grows beautiful red flowers. They are commonly found in Japan, and tend to…

A tree which produces dark red flowers and fragrant green leaves. The leaves are oval and serrated. They are native to Japan.

Pyrus Japonica

A tree which produces dark red flowers and fragrant green leaves. The leaves are oval and serrated.…

A plant which grows peculiar white fruits.

Pyrus Leucocarpa

A plant which grows peculiar white fruits.

A plant which produces brightly-colored fruits, approximately 1.5 inches in diameter. They generally grow up to 20 feet in height, and are native to Europe.

Pyrus Malus Bertini

A plant which produces brightly-colored fruits, approximately 1.5 inches in diameter. They generally…

A plant which consists of long, persistent calyx segments. They generally grow up to 20 feet in height, and are native to Europe.

Pyrus Malus Crataegina

A plant which consists of long, persistent calyx segments. They generally grow up to 20 feet in height,…

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…

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 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 Cydonia oblonga. It is native to southwest Asia, and produces yellow pear-shaped pome fruits. The flowers tend to be white or pink, and consist of 5 petals.

Quince

Also known as Cydonia oblonga. It is native to southwest Asia, and produces yellow pear-shaped pome…

A palm tree that is commonly found in Australia and New Zealand. They tend to reach about 32 feet, and the fruits grown turn bright red when ripe.

Rhopalostylis Baueri

A palm tree that is commonly found in Australia and New Zealand. They tend to reach about 32 feet, and…

"This picture was drawn by a British engineer a few days after the battle. The view is from the north side of the hill, looking south from the spot occupied by the New Hampshire troops, under Colonel Stark and Colonel Reed. Portions of the rail-fence are to be seen. The Connecticut troops, under Colonel Knowlton, occupied the ground between the three in the centre of the view and the fort. The ground between the tree and the fort, and toward the left of the picture, was thickly strewed with the killed and wounded British soldiers. The Americans retreated past the trees at the right of the picture."—Coffin, 1879

Bunker Hill After the Battle

"This picture was drawn by a British engineer a few days after the battle. The view is from the north…

Also known as the cabbage tree. They are endemic to New Zealand and can grow up to 66 feet in height. The trunk is stout and the leaves are sword-like.

Dracaena Australis

Also known as the cabbage tree. They are endemic to New Zealand and can grow up to 66 feet in height.…

"D. Brasiliensis is exceedingly handsome for the center of a vase or stand, forming a beautiful object, with its fine, broad, recurving foliage."—Heinrich, 1887

Dracaena Brasiliensis

"D. Brasiliensis is exceedingly handsome for the center of a vase or stand, forming a beautiful object,…

Also known as Pandanus utilis. It is a tropical tree with an edible fruit. It is native to Madagascar and Mauritius.

Screwpine

Also known as Pandanus utilis. It is a tropical tree with an edible fruit. It is native to Madagascar…

"The bark lies immediately beneath the epidermis. It consists of several layers. In the early state it is cellular, and is exactly like the pith with which it is in contact; but by the production of vessels and woody fiber, they are separated and become very different in appearance and constitution. The bark consists of two portions, the cellular and vascular, the latter of which is called liber, and the inner portion of the bark."—Darby, 1855

The Bark

"The bark lies immediately beneath the epidermis. It consists of several layers. In the early state…

A characteristic found in woods. They are the radial ribbons extending vertically through the tree across and perpendicular to the growth rings.

Medullary Rays

A characteristic found in woods. They are the radial ribbons extending vertically through the tree across…

"These roots are such as subdivide in the earth in a manner similar to the divisions of the stem, and are found exhibited in the forest trees and shrubs."—Darby, 1855

Branching Root

"These roots are such as subdivide in the earth in a manner similar to the divisions of the stem, and…

"A philosopher, seating himself under an oak tree, and viewing its massiveness, could not understand why so large a tree should produce such small fruit. 'There,' said he, 'is the pumpkin, growing on a slender vine; how much better it would be, if that vine bore acorns, and the great tree the pumpkins; then there would be some harmony and fitness in nature.' As he was meditating on this subject, and examining some ancient theories on the works of creation, an acorn dropped on his head and broke up the train of his reflections. 'How foolish and short-sighted I am, to question the wisdom of Providence,' thought the philosopher, 'if the acorn had been a pumpkin, my head would have been broken.'"—Barber, 1857

Man Thinks Himself Wise, till God Shows Him His Folly

"A philosopher, seating himself under an oak tree, and viewing its massiveness, could not understand…

"The oak that lifts its stately head on high, / The tempest blast, and whirlwind will defy; / But a small ax, within the woodman's hand, / More powerful proves - its force it cannot stand; / By little strokes, quickly, and often made, / The giant monarch oak is lowly laid: / By feeble means, great wonders meet our eyes, / The forest falls, and splendid cities rise."—Barber, 1857

Little Strokes Fell Great Oaks

"The oak that lifts its stately head on high, / The tempest blast, and whirlwind will defy; / But a…

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,…

Also known as Platanus occidentalis. This tree can grow to massive sizes, up to 130 feet in height and 6 feet in diameter.

Sycamore Tree

Also known as Platanus occidentalis. This tree can grow to massive sizes, up to 130 feet in height and…

Also known as a carob tree or Ceratonia siliqua. It is a flowering shrub or tree native to the Mediterranean region. It is commonly cultivated for its edible seed pods.

Locust Tree

Also known as a carob tree or Ceratonia siliqua. It is a flowering shrub or tree native to the Mediterranean…

Also known as ficus. They are native throughout the tropics and are cultivated for the fruit, the fig. Figs are important food resources for wildlife.

Fig Tree

Also known as ficus. They are native throughout the tropics and are cultivated for the fruit, the fig.…

"Picture writing of the Tahltan, a British Columbia tribe. The drawing was done in charcoal on the blazed trunk of a tree. The meaning is: 'Using a raft, I shot three geese.'"—Webster, 1913

Indian Picture Writing

"Picture writing of the Tahltan, a British Columbia tribe. The drawing was done in charcoal on the blazed…

A farmhouse surrounded by trees.

Farmhouse

A farmhouse surrounded by trees.

A tree cricket that lives in trees and shrubs. They feed on plant parts, other insects, and fungi.

Snowy Tree Cricket

A tree cricket that lives in trees and shrubs. They feed on plant parts, other insects, and fungi.

"The Buffalo Tree-Hopper and its work: a, Adult; b, Fresh egg slits; c, Eggs in slits, natural size; d, Eggs enlarged; e, Scars produced by egg slits."—The Federal Digest, 1921

Buffalo Tree-Hopper

"The Buffalo Tree-Hopper and its work: a, Adult; b, Fresh egg slits; c, Eggs in slits, natural size;…

The state banner of Maine, the pine tree state.

Maine

The state banner of Maine, the pine tree state.

A tree squirrel.

Gray Squirrel

A tree squirrel.

Three birds sitting in a tree.

Three Birds

Three birds sitting in a tree.

Also known as Pinus strobus. A pine cone of the Eastern White Pine.

Eastern White Pine

Also known as Pinus strobus. A pine cone of the Eastern White Pine.

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 Pinus lamertiana. The pine cone of a sugar pine tree.

Pine Cone of Sugar Pine

Also known as Pinus lamertiana. The pine cone of a sugar pine tree.

Also known as Pinus strobiformis. A pine cone of the Chihuahua White Pine tree.

Pine Cone of a Chihuahua White Pine

Also known as Pinus strobiformis. A pine cone of the Chihuahua White Pine tree.

Also known as Pinus flexilis. A pine cone of the Limber Pine tree.

Pine Cone of Limber Pine

Also known as Pinus flexilis. A pine cone of the Limber Pine tree.

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.

Also known as Pinus balfouriana. The pine cone of a Foxtail Pine tree.

Pine Cone of Foxtail Pine

Also known as Pinus balfouriana. The pine cone of a Foxtail Pine tree.

A pine cone of a Pinus aristata.

Pine Cone of Pinus Aristata

A pine cone of a Pinus aristata.

Also known as Pinus quadrifolia. The pine cone of a Parry Pinyon tree.

Pine Cone of a Parry Pinyon

Also known as Pinus quadrifolia. The pine cone of a Parry Pinyon tree.