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Shoots of briar must be cut back before the rose buds once the buds are safely established.

Shoots of Briar

Shoots of briar must be cut back before the rose buds once the buds are safely established.

The common name of callistephus is China Aster. The flower heads are dark purple. Each branch has a single head.

Flower-Heads of Callistephus Chinensis Vars

The common name of callistephus is China Aster. The flower heads are dark purple. Each branch has a…

The common name of cannabis is hemp. Cannabis sativa flowers are greenish in color and grow on long stalks. The plant can grow up to twenty feet tall. Hemp is cultivated for its fiber.

Head of Cannabis Sativa

The common name of cannabis is hemp. Cannabis sativa flowers are greenish in color and grow on long…

Fig is a fruit producing tree. The cultivation of figs goes back to ancient times. It is native to the Mediterranean region, Syria, eastern Persia, and Afghanistan.

Fruiting Branch of Fig

Fig is a fruit producing tree. The cultivation of figs goes back to ancient times. It is native to the…

The common name of fritillaria meleagris is common fritillary or snake's head. The flowers are checked with pale and dark purple. There are also white and double flowered forms of this species.

Habit and Detached Single Flower of Fritillariia Meleagris

The common name of fritillaria meleagris is common fritillary or snake's head. The flowers are checked…

The flower heads of globularia alypum are pale and grow at the end of the stems. The stem is shrubby. This shrub grows to be two feet tall.

Flower Head of Globularia Alypum

The flower heads of globularia alypum are pale and grow at the end of the stems. The stem is shrubby.…

Grafting is placing two cut surfaces of one or different plants under conditions which cause them to grow together. Side grafting is used to insert scions without cutting away the head of the stock.

Side Grafting

Grafting is placing two cut surfaces of one or different plants under conditions which cause them to…

The garden hammer are usually used in gardening for nailing wall trees. The hammer head is short and flat at the end used for driving nails.

Garden Hammer

The garden hammer are usually used in gardening for nailing wall trees. The hammer head is short and…

The hastate leaf is formed like the head of a halbert.

Hastate Leaf

The hastate leaf is formed like the head of a halbert.

Sunflower grow to be six feet tall. The flower heads are large, varying in size and color.

Flower Head of a Sunflower

Sunflower grow to be six feet tall. The flower heads are large, varying in size and color.

Helianthus annus caifornicus plenissimus is the scientific name of the pictured sunflower. It is another form of the common sunflower.

Habit and Detached Single Flower Head of a Sunflower

Helianthus annus caifornicus plenissimus is the scientific name of the pictured sunflower. It is another…

Helianthus orgyalis sunflowers have small, yellow heads. The flowers bloom in the autumn. The plant grows between six and ten feet tall.

Upper Portion of Stems and Detached Flower Head of a Sunflower (Helianthus Orgyalis)

Helianthus orgyalis sunflowers have small, yellow heads. The flowers bloom in the autumn. The plant…

Helichrysum bracteatum aureum are everlastings with golden yellow flower heads.

Habit and Detached Flower Head of Everlastings (Helichrysum Bracteatum Aureum)

Helichrysum bracteatum aureum are everlastings with golden yellow flower heads.

Helichrysum foetidum is a variety of everlastings with light yellow flower heads. The flowers bloom June through September. The shrub grows two feet high.

Habit and Detached Single Flower Head of Everlastings (Helichrysum Foetidum)

Helichrysum foetidum is a variety of everlastings with light yellow flower heads. The flowers bloom…

The common name of hemerocallis is day lily. The middendorfii variety has deep, golden yellow flowers. There are three to four flowers on each head at the end of the stem.

Habit and Detached Head of Flowers of Hemerocallis Middendorfii

The common name of hemerocallis is day lily. The middendorfii variety has deep, golden yellow flowers.…

Larva are unlike the mature insect. Larva of the moth or butterfly resemble worms. It may have a distinct head and the rings of the body may differ in the three immediately behind the head.

Larva of a Leopard Moth

Larva are unlike the mature insect. Larva of the moth or butterfly resemble worms. It may have a distinct…

The flower heads are yellow. The flowers bloom in July and August. Each stem is hairy with one flower head.

Inula Glandulosa

The flower heads are yellow. The flowers bloom in July and August. Each stem is hairy with one flower…

Kohlrabi is a distinct vegetable. It is often described as a cross between a cabbage and a turnip. The upper part of the stem swells in a large, fleshy head above ground, resembling a turnip.

Kohlrabi

Kohlrabi is a distinct vegetable. It is often described as a cross between a cabbage and a turnip. The…

A turf beater is used to spread fine, light soil. The tool is made with a flattened head.

Turf Beater

A turf beater is used to spread fine, light soil. The tool is made with a flattened head.

Edelweiss is the common name of leontopodium alpinum. The flowers heads are enveloped in woolly bracts. The flowers bloom in June and July.

Flower Head of Edelweiss

Edelweiss is the common name of leontopodium alpinum. The flowers heads are enveloped in woolly bracts.…

The larva, or caterpillar, of the leopard moth is whitish with black glossy spots. The caterpillar has a blackish plate on the segment next to the head. These caterpillars feed on the wood in the interior of the stems and branches of pear, apple, or plum trees.

Caterpillar of the Leopard Moth

The larva, or caterpillar, of the leopard moth is whitish with black glossy spots. The caterpillar has…

Cabbage lettuces have broad, rounded leaves forming a low, spreading head nearly close on the ground.

Cabbage Lettuce

Cabbage lettuces have broad, rounded leaves forming a low, spreading head nearly close on the ground.

These are detached flower heads of two different varieties of leucocoryne ixiodes. One flower head has entire segments. The other flower head has toothed segments.

Detached Flower Heads of Two Varieties of Leucocoryne Ixiodes

These are detached flower heads of two different varieties of leucocoryne ixiodes. One flower head has…

The common names of liatris are blazing star and button snake root. The spicata variety has purple flowers heads that grow in spikes six to fifteen inches long. The entire plant is one to two feet tall.

Habit and Detached Flower Head of Liatris Spicata

The common names of liatris are blazing star and button snake root. The spicata variety has purple flowers…

Ligularia macrophylla flowers are yellow and grow densely on a long, terminal spike. The plant grows three and a half feet tall.

Habit and Detached Flower Head of Ligularia Macrophylla

Ligularia macrophylla flowers are yellow and grow densely on a long, terminal spike. The plant grows…

The larvae of the lily beetle live on lilies, devouring their leaves. The antennae are on the front of the head of the beetle.

Eggs, Larvae, and Perfect Insect of the Lily Beetle

The larvae of the lily beetle live on lilies, devouring their leaves. The antennae are on the front…

Satin moth is the common name of liparis salicis. The caterpillar bears a row of white spots down the middle of the back. This row is bordered on each side by a broad black stripe. The caterpillars usually feed on poplars and willows.

Caterpillar of the Satin Moth

Satin moth is the common name of liparis salicis. The caterpillar bears a row of white spots down the…

Pictured are the habit, a detached flower head, a leaf, and a single floret of lonas inodora. The flowers are small and yellow. The flowers bloom July to October.

Lonas Inodora

Pictured are the habit, a detached flower head, a leaf, and a single floret of lonas inodora. The flowers…

The common name of mimosa pudica is humble plant. The flowers are red and bloom in summer. The stem is very prickly. The plant grows one foot tall.

Flowering Branch, Single Flower Head, and Leaf of Mimosa Pudica

The common name of mimosa pudica is humble plant. The flowers are red and bloom in summer. The stem…

Death's head moth feeds on potato, goji berry, and jasmine plants. These moths often have a straight or curved horn, or tail, at the end of the body.

Death's Head Moth

Death's head moth feeds on potato, goji berry, and jasmine plants. These moths often have a straight…

Olearia gunnia flowers are white and bloom in September. The branches are hoary. Pictured is a flowering branch, branchlet, and flower head of olearia gunnia.

Olearia Gunniana

Olearia gunnia flowers are white and bloom in September. The branches are hoary. Pictured is a flowering…

Pictured is a flowering branch and detached flower head of oreopanax andreanum. The flowers are globe shaped heads. The leaves are roundish and the trunk is simple or slightly branched.

Oreopanax Andreanum

Pictured is a flowering branch and detached flower head of oreopanax andreanum. The flowers are globe…

The common name of ornithogalum is Star of Bethlehem. The nutans variety has flowers that are white on the upper side and green on the back. The scape is eight to twelve inches long.

Ornithogalum Nutans

The common name of ornithogalum is Star of Bethlehem. The nutans variety has flowers that are white…

Star of Bethlehem is the common name of ornithogalum. The pyramidale variety has pure white flowers marked with a green stripe on the back. The flowers are arranged in clone shaped clusters. The flower clusters are six to eight inches long.

Habit and Detached Single Flower of Ornithogalum Pyramidale

Star of Bethlehem is the common name of ornithogalum. The pyramidale variety has pure white flowers…

The common name of paeonia is peony. The wittmanniana variety yellowish white flowers. The flowers bloom in April. Each stem has one flower head.

Flowering Branch of Paeonia Wittmanniana

The common name of paeonia is peony. The wittmanniana variety yellowish white flowers. The flowers bloom…

The common names of pavia are buckeye and smooth-fruited horse chestnut. The californica variety has white or pale rose flowers. The flowers are very fragrant and cover the dense head of the tree. Pictured is the flowering branch, detached leaf, flower, and young fruit of pavia californica.

Pavia Californica

The common names of pavia are buckeye and smooth-fruited horse chestnut. The californica variety has…

Schizaeaceae: 1, aneimia, sporangium. Osmundaceae: 2, Osmunda, sporangium; a, front view, b, back view. Salviniaceae: 3, salvinia, a, whole plant; b, section of sporocarps showing sporangia. Marsileaceae: 4, marsilea, a, whole plant; b, sporocarp germinating; c, sporocarp emitting gelatinous thread with sori; 5, pilularia, a, cross section of sporocarp; b, sporocarp emitting sporangia.

Schizaeaceae, Osmundaceae, Salviniaceae, and Marrsileaceae

Schizaeaceae: 1, aneimia, sporangium. Osmundaceae: 2, Osmunda, sporangium; a, front view, b, back view.…

<i>Aechmea miniata variety discolor</i> has purple leaves or leaves that are violet-brown on the back.

Aechmea Miiniata Variety Discolor

Aechmea miniata variety discolor has purple leaves or leaves that are violet-brown on the back.

The edible parts of the artichoke are the the fleshy receptacle of the flower head and the thickened base of the scales. They can be eaten raw but are usually boiled and served with butter or sauce.

Edible Heads of Artichoke

The edible parts of the artichoke are the the fleshy receptacle of the flower head and the thickened…

The hole of the nesting box should be well near the top with no perch near. The roof should slope from the back toward the front and should project about three inches.

Nesting Box

The hole of the nesting box should be well near the top with no perch near. The roof should slope from…

Illustrated is a border enclosing the back area of a city place, the central area being planted for shade.

Border Enclosing an Urban Backyard

Illustrated is a border enclosing the back area of a city place, the central area being planted for…

Illustrated is a head of savoy cabbage.

Savoy Cabbage

Illustrated is a head of savoy cabbage.

Illustrated is a modern cabbage plant in head. It is early flat Dutch cabbage.

Early Flat Dutch Cabbage

Illustrated is a modern cabbage plant in head. It is early flat Dutch cabbage.

Illustrated is a section of cabbage head. It shows the thickened rachis and leaf stalks. It also shows the buds in the axils.

Section of Cabbage Head

Illustrated is a section of cabbage head. It shows the thickened rachis and leaf stalks. It also shows…

Illustrated is a carnation plant showing where to top or to head back (a).

Carnation Plant

Illustrated is a carnation plant showing where to top or to head back (a).

Chelone glabra usually grows one to two feet tall. The flowers are white or rose tinged.

Chelone Glabra

Chelone glabra usually grows one to two feet tall. The flowers are white or rose tinged.

The purple stamens of clematis florida bicolor are somewhat petal-like and form a dense, purple head in the center of the flower.

Clematis Florida Bicolor

The purple stamens of clematis florida bicolor are somewhat petal-like and form a dense, purple head…

Crataegus coccinioides sometimes grows twenty feet tall. The branches are stout and spreading, forming a broad, handsome head. There are five to seven flowers in a cluster. The fruit is dark crimson and appears in early October.

Crataegus Coccinioides

Crataegus coccinioides sometimes grows twenty feet tall. The branches are stout and spreading, forming…

Cupressus macnabiana is a small tree, growing twenty feet tall. The tree forms a dense, pyramidal head. The tree is native to California.

Cupressus Macnabiana

Cupressus macnabiana is a small tree, growing twenty feet tall. The tree forms a dense, pyramidal head.…

Illustrated is a floret from the flower head of dandelion.

Floret of Dandelion

Illustrated is a floret from the flower head of dandelion.

Illustrated is the head of a grasshopper. It shows the great eye and a detail of a part of the surface of the compound eye.

Head of Grasshopper

Illustrated is the head of a grasshopper. It shows the great eye and a detail of a part of the surface…

The flowers of erica melanthera are rosy. The flowers bloom in December and January. The leaves are thick and grooved on the back.

Erica Melanthera

The flowers of erica melanthera are rosy. The flowers bloom in December and January. The leaves are…

The flowers of laelia anceps are purplish/rose colored. The petals have a greenish line on the back. This orchid is native to Mexico.

Laelia Anceps

The flowers of laelia anceps are purplish/rose colored. The petals have a greenish line on the back.…

Lantana camara is a small shrub that grows from one to four feet tall. It is hairy, sometimes with short hooked prickles. The flowers grow in a dense, nearly flat topped head. The flowers usually bloom yellow or pink but shift into deep orange and scarlet coloration.

Lantana Camara

Lantana camara is a small shrub that grows from one to four feet tall. It is hairy, sometimes with short…

Illustrated is a heading type of lettuce.

Lettuce

Illustrated is a heading type of lettuce.

Illustrated are the landslide and back views of a steel moldboard plow. Also shown is the subsoiling attachment.

Steel Moldboard Plow

Illustrated are the landslide and back views of a steel moldboard plow. Also shown is the subsoiling…

The common names of <i>nyssa sylvatica</i> are tupelo, pepperidge, black gum, and sour gum. The tree grows to 100 feet tall. The slender branches form a flat topped, cylindrical head.

Nyssa Sylvatica

The common names of nyssa sylvatica are tupelo, pepperidge, black gum, and sour gum. The tree grows…

Attachment of suspension. This particular model is used when trolley wire comes to end at a hanger. The ear has two purposes: holding the wire and splicing it. The ends of the trolley wire are passed through and bent back over the openings (h).

Splicing Ear

Attachment of suspension. This particular model is used when trolley wire comes to end at a hanger.…

A relatively small rheostat (resistance box) that is attached to switchboard S and is operated with wheel W. This particular model was used by General Electric Company and are generally attached to the back of the switchboard.

Field Rheostat

A relatively small rheostat (resistance box) that is attached to switchboard S and is operated with…

An illustration of what it would look like if ball e that is placed in a cup attached to lever o were to be pushed out by using a swinging arm activated by spring d. Spring d is arranged in a manner that when it is drawn back and released, it will strive lever o and ball b at the same time. In the experiment, ball b follows the curved line and ball e is dropped vertically. Both will meet the floor at the same time. This experiment is meant to show how Newton's second law works. The acceleration of a body is parallel and directly proportional to the net force and inversely proportional to the mass. F = ma

Second Law

An illustration of what it would look like if ball e that is placed in a cup attached to lever o were…