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The leaves of <i>Allium neapolitanum</i> are long and narrow. The flowers are large, pure white, with colored stamens.

Allium Neapolitanum

The leaves of Allium neapolitanum are long and narrow. The flowers are large, pure white, with colored…

The common name of <i>Allium tricoccum</i> is common wild leek. The flowers are greenish white on a scape four to twelve inches high. This plant grows in clumps.

Allium Tricoccum

The common name of Allium tricoccum is common wild leek. The flowers are greenish white on a scape four…

The leaves of <i>Alloplectus schlimii</i> are green above and violet or violet purple beneath. The calyx is spotted with green and the corolla is yellow scarlet below, shading upward into a delicate violet.

Alloplectus Schlimii

The leaves of Alloplectus schlimii are green above and violet or violet purple beneath. The calyx is…

The young branchlets either have a small amount of short, fine hair or they have none. The leaves are four to six inches long, slightly lobed, and oval shaped. The tree grows up to sixty feet tall.

Alnus Tinctoria

The young branchlets either have a small amount of short, fine hair or they have none. The leaves are…

The common name of <i>Alnus glutinous</i> is black alder. The leaves are two to five inches long with five to seven pairs of veins. The tree grows up to seventy feet tall.

Black Alder

The common name of Alnus glutinous is black alder. The leaves are two to five inches long with five…

The leaves of <i>Alocasia sanderiana</i> are long with deeply notched margins. The leaves are a deep, glossy green with a metallic reflection. The leaves also have prominent white margins and veins.

Alocasia Sanderiana

The leaves of Alocasia sanderiana are long with deeply notched margins. The leaves are a deep, glossy…

The stalks of <I>Alocasia cuprea</i> are two feet or less long and green. The leaves are dark metallic green with a darker rib and veins. The underside of the leaves are rich purple.

Alocasia Cuprea

The stalks of Alocasia cuprea are two feet or less long and green. The leaves are dark metallic green…

The leaves of <i>Aloe serrulata</i> are spirally arranged and spreading. The leaves have scattered, elongated white blotches and a white margin.

Aloe Serrulata

The leaves of Aloe serrulata are spirally arranged and spreading. The leaves have scattered, elongated…

The leaves of <I>Aloe mitriformis</I> are upcurved and slight egg shaped. The leaves are somewhat prickly toward the tip beneath. The flowers are two inches long and bright red.

Aloe Mitriformis

The leaves of Aloe mitriformis are upcurved and slight egg shaped. The leaves are somewhat prickly toward…

<I>Alonso incisifolia</I> grows about two feet high. The flowers grow nearly two inches across, are irregular, and scarlet. There is also a white flowered variety.

Alonsoa Incisifolia

Alonso incisifolia grows about two feet high. The flowers grow nearly two inches across, are irregular,…

<I>Alpine Mutica</I> has very short stalked leaves. The outer segments of the flowers are white while the bright yellow lip is veined with crimson.

Alpinia Mutica

Alpine Mutica has very short stalked leaves. The outer segments of the flowers are white while the bright…

<I>Alsophila australis</I> has ample leaves. The pinnae are eighteen inches long. This fern is native to Australia.

Alsophila Australis

Alsophila australis has ample leaves. The pinnae are eighteen inches long. This fern is native to Australia.

The leaves of <I>Alsophila oligocarpa</I> a smooth and a grayish straw color. The fern is native to Colombia.

Alsophila Oligocarpa

The leaves of Alsophila oligocarpa a smooth and a grayish straw color. The fern is native to Colombia.

The flowers of <I>Alstroemeria pulchella</I> are dark red tipped with green and spotted inside with brown. The flowering stem is two to three feet tall with scattered leaves.

Alstroemeria Pulchella

The flowers of Alstroemeria pulchella are dark red tipped with green and spotted inside with brown.…

Sweet alyssum is the common name of <I>Alyssum maritime</i>. The flowers grow in clusters at the end of the stems. The flowers have a honey scent. The leaves taper to the base.

Sweet Alyssum

Sweet alyssum is the common name of Alyssum maritime. The flowers grow in clusters at the end of the…

<I>Ampelopsis heterophylla variety amurensis</i> has hairy branchlets. The leaves are slightly three lobed and are two to four inches long.

Ampelopsis Heterophylla Variety Amurensis

Ampelopsis heterophylla variety amurensis has hairy branchlets. The leaves are slightly three lobed…

The common names of <I>Anagalis arvensis</I> are common pimpernel and poor man's weatherglass. The flowers are scarlet varying to white. The leaves are opposite or in threes.

Anagalis Arvensis

The common names of Anagalis arvensis are common pimpernel and poor man's weatherglass. The flowers…

Pineapple is the common name of <I>Ananas sativus</i>. The fruit is borne on top of a rosette of stiff leaves.

Pineapple

Pineapple is the common name of Ananas sativus. The fruit is borne on top of a rosette of stiff leaves.

<I>Ananas sativus variety variegates</i> is a variety of pineapple. This variety has striped leaves.

Ananas Sativus Variety Variegatus

Ananas sativus variety variegates is a variety of pineapple. This variety has striped leaves.

<I>Andromeda polifolia</i> grows up to two feet tall. The flowers nod on small, slender stems. The leaves are oblong and narrow.

Andromeda Polifolia

Andromeda polifolia grows up to two feet tall. The flowers nod on small, slender stems. The leaves are…

Pictured is the single flowered form of <I>Anemone coronaria.</I> The common name is poppy-flowered anemone. The flowers have many mixtures of colors from red, blue, white, and more.

Anemone Coronaria

Pictured is the single flowered form of Anemone coronaria. The common name is poppy-flowered anemone.…

<I>Anemone fulgens</i> flowers are two inches across and vivid scarlet with a black stamen. Several leaves grow beneath each flower.

Anemone Fulgens

Anemone fulgens flowers are two inches across and vivid scarlet with a black stamen. Several leaves…

The common name of <I>Anemone nemorosa</i> is wood anemone. The flowers are one inch across and are white or purplish. The stem is simple, nearly smooth, and three to eight inches tall.

Anemone Nemorosa

The common name of Anemone nemorosa is wood anemone. The flowers are one inch across and are white or…

The stems of <I>Angraecum superbum</I> are four feet or more tall. The flowers are green and spreading with a white lip. The leaves are up to two feet long.

Angraecum Superbum

The stems of Angraecum superbum are four feet or more tall. The flowers are green and spreading with…

The common names of <I>Annona muricata</i> are soursop, guanabana, corosol, coracao de rainha, graviola, suirsaak, and zuursaak. The tree is a small evergreen and is the size of a peach tree. The fruit is very large and fleshy, sometimes weighing up to five pounds. The fruit is oval or heart shaped. The pulp is white and juicy with a slight mango like flavor.

Annona Muricata

The common names of Annona muricata are soursop, guanabana, corosol, coracao de rainha, graviola, suirsaak,…

Some of the common names of <I>Annona squamosa</i> are sugar apple, sweet sop, anon, and atta. The fruit is about the size of an orange. The pulp is yellowish white, creamy or custard like, very sweet and pleasantly flavored.

Annona Squamosa

Some of the common names of Annona squamosa are sugar apple, sweet sop, anon, and atta. The fruit is…

<I>Anoetochilus regalis</I> flowers are some of the most attractive of the anoetochilus. The leaves are oval, large, and bronze green veined with gold. The surface of the leaves have a velvety texture.

Anoectochilus Regalis

Anoetochilus regalis flowers are some of the most attractive of the anoetochilus. The leaves are oval,…

The leaf blades of </I>Anthurium andraeanum</I> are drooping. The flower spike is three to four inches long and yellowish with a white band.

Anthurium Andraeanum

The leaf blades of Anthurium andraeanum are drooping. The flower spike is three to four inches long…

Pictured is a young leaf, not yet showing the arched depressions, of <I>Anthurium veitchii</I>. The leaf blade are often three to four feet long. The leaves are metallic green.

Anthurium Veitchii

Pictured is a young leaf, not yet showing the arched depressions, of Anthurium veitchii. The leaf blade…

The leaves are <I>Anthurium warocqueanum</I> are oblong and long tapering. The leaves hang two to four feet long. The leaves are a deep, velvety green with the rib and principal veins a lighter shade.

Anthurium Warocqueanum

The leaves are Anthurium warocqueanum are oblong and long tapering. The leaves hang two to four feet…

The albus variety of <I>Antigonon Leptopus</I> has flowers that are nearly or quite white. Pictured is a plant grown under glass.

Albus Variety of Antigonon Leptopus

The albus variety of Antigonon Leptopus has flowers that are nearly or quite white. Pictured is a plant…

The common name of <I>Antirrhinum orontium</I> is small snapdragon. The flowers are small and purple or white. The leaves are linear.

Antirrhinum Orontium

The common name of Antirrhinum orontium is small snapdragon. The flowers are small and purple or white.…

The common name of <I>Antirrhinum majus</I> is common or large snapdragon. The flowers are large and come in many colors ranging from red to purple to white. Pictured is a young spike of a dwarf form.

Antirrhinum Majus

The common name of Antirrhinum majus is common or large snapdragon. The flowers are large and come in…

<I>Aphyllon uniflorum</I> has white or violet flowers. Each stem has one flower and is leafless. The plant is known as cancer-root.

Aphyllon Uniflorum

Aphyllon uniflorum has white or violet flowers. Each stem has one flower and is leafless. The plant…

<I>Apicra pentagona</I> has an erect stem that is six to twelve inches tall. The flowers are a greenish color. The leaves are somewhat triangular and are white dotted.

Apicra Pentagona

Apicra pentagona has an erect stem that is six to twelve inches tall. The flowers are a greenish color.…

The flowers of the apricot are pink-white. The flowers grow singly and precede the leaves.

Flowers of the Apricot

The flowers of the apricot are pink-white. The flowers grow singly and precede the leaves.

Pictured are radical leaves of aquilegia canadensis, common name common columbine. The leaves are one to two inches and have three divisions.

Radical Leaves of Aquilegia Canadensis

Pictured are radical leaves of aquilegia canadensis, common name common columbine. The leaves are one…

The stem of <I>Aquilegia alpina</I> is nearly one foot tall. The plant has two to five flowers. The flowers are blue, rarely pale or white.

Aquilegia Alpina

The stem of Aquilegia alpina is nearly one foot tall. The plant has two to five flowers. The flowers…

<I>Aquilegia glandulosa</I> is one to three flowered. The flowers are large and nodding. The flowers are lilac-blue topped with creamy white.

Aquilegia Glandulosa

Aquilegia glandulosa is one to three flowered. The flowers are large and nodding. The flowers are lilac-blue…

The common name of arabis is rock-cress. The albida variety is only a few inches tall. The plant is covered in short, fine hairs. The lower leaves are narrow at the base.

Arabis Albida

The common name of arabis is rock-cress. The albida variety is only a few inches tall. The plant is…

The common name of <I>Aralia chinensis</I> is Chinese Angelica Tree. The tree grows forty feet tall. The leaves are two to four feet long and usually do not have prickles.

Aralia Chinensis

The common name of Aralia chinensis is Chinese Angelica Tree. The tree grows forty feet tall. The leaves…

The common name of <I>Araucaria excelsa</I> is Norfolk Island Pine. The plant is light green and has curved, soft, sharp pointed leaves. The leaves are densely placed on drooping branchlets.

Araucaria Excelsa

The common name of Araucaria excelsa is Norfolk Island Pine. The plant is light green and has curved,…

The leafy branchlets of <I>Araucaria rulei</I> are very long. The leaves are oval and concave. The leaves are very gray on the upper side and a rich glossy green on the lower side.

Araucaria Rulei

The leafy branchlets of Araucaria rulei are very long. The leaves are oval and concave. The leaves are…

Araucaria bidwillii</I> is rather narrow in growth. The branches are simple and the leaves grow in two rows.

Araucaria Bidwillii

Araucaria bidwillii is rather narrow in growth. The branches are simple and the leaves grow in two rows.

The common name of <I>Araucaria imbricata</I> is monkey puzzle. The leaves overlap. The leaves are very stiff, leathery, and sharp pointed.

Araucaria Imbricata

The common name of Araucaria imbricata is monkey puzzle. The leaves overlap. The leaves are very stiff,…

Pictured is a commanding white oak on a bank margin.

White Oak

Pictured is a commanding white oak on a bank margin.

White oak is an ideal shade tree.

White Oak

White oak is an ideal shade tree.

Lepidopterous caterpillars eat leaves of trees.

Lepidopterous Caterpillar

Lepidopterous caterpillars eat leaves of trees.

Illustrated is an injury to leaves by a large sized, leaf eating caterpillar.

Leaves Eaten by Caterpillar

Illustrated is an injury to leaves by a large sized, leaf eating caterpillar.

Woolly aphis is a plant lice. Eggs are attached to twigs during the winter. In the spring soft-bodied, wingless female aphid appear and give birth to young aphids. They suck the juices from leaves or twigs.

Wooly Aphis on Alnus

Woolly aphis is a plant lice. Eggs are attached to twigs during the winter. In the spring soft-bodied,…

Pictured is a white pine sapling that has an injured tip due to the white pine weevil. The white pine weevil feeds exclusively beneath the bark of the terminal shoots of young trees.

Injured White Pine Sapling

Pictured is a white pine sapling that has an injured tip due to the white pine weevil. The white pine…

Pictured are phylloxera galls on chestnut. Insect larvae cause malformations or swellings of the leaves or twigs, known as galls.

Phylloxera Galls on Chestnut

Pictured are phylloxera galls on chestnut. Insect larvae cause malformations or swellings of the leaves…

The larvae of leaf-miners eat out the tissue of the leaves of elm between the lateral veins. This leaves the leaves with a seared appearance in spots.

Leaf-Miners' Galleries in Elm

The larvae of leaf-miners eat out the tissue of the leaves of elm between the lateral veins. This leaves…

The tarspot disease of maple is caused by rhytisma acerinum. The diseased spots appear as blotches of tar on the upper surface of leaves.

Maple Leaf with Tarspot Fungus

The tarspot disease of maple is caused by rhytisma acerinum. The diseased spots appear as blotches of…

Pictured is the stem of a white pine tree attacked by the white pine blister-rust fungus, <I>Cronartium ribicola</I>. Illustrated is the fruiting stage in the process of rupturing the bark.

White Pine Tree Stem with Fungus

Pictured is the stem of a white pine tree attacked by the white pine blister-rust fungus, Cronartium…

Illustrated is the base of a young white pine tree attacked by <I>Armillaria mellea</I>. The mushroom <I>Armillaria mellea</I> can become parasitic, killing trees over large areas.

White Pine Tree Attacked by Armillaria Mellea

Illustrated is the base of a young white pine tree attacked by Armillaria mellea. The mushroom Armillaria…

<I>Fomes igniarius</I> is a shelf fungus that causes the white heart-rot of deciduous trees. Pictured is the nigricans variety. The lighter color represents the spore-bearing surface.

Nirgricans Variety of Fomes Igniarius

Fomes igniarius is a shelf fungus that causes the white heart-rot of deciduous trees. Pictured is the…

The common name of <I>Arbutus menziesii</I> is madrona. The tree occasionally grows one hundred feet tall. The leaves are rounded or slightly heart shaped at the base. The flowers are white and the fruit is bright orange-red.

Arbutus Menziesii

The common name of Arbutus menziesii is madrona. The tree occasionally grows one hundred feet tall.…

The <I>Arbutus arizonica</I> tree grows between forty and fifty feet tall. The trunk has light gray or nearly white bark. The fruit is either round or oblong.

Arbutus Arizonica

The Arbutus arizonica tree grows between forty and fifty feet tall. The trunk has light gray or nearly…

Bear berry is the common name of <I>Arctostaphylos uva-ursi</I>. The flowers are small, white and tinged with red. The leaves are used medicinally.

Bear Berry

Bear berry is the common name of Arctostaphylos uva-ursi. The flowers are small, white and tinged with…