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<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…

<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 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…

<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,…

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 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.…

<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 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,…

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 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…

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.…

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…

The <I>Arctostaphylos manzanita</I> shrub grows thirty feet tall. The fruit is between one quarter and one half an inch long. The leaves are dull green and egg shaped.

Arctostaphylos Manzanita

The Arctostaphylos manzanita shrub grows thirty feet tall. The fruit is between one quarter and one…

<I>Ardisia crenulata</I> has oblong, wavy margined leaves. The fruit droops is clusters. The flowers are sweet scented.

Ardisia Crenulata

Ardisia crenulata has oblong, wavy margined leaves. The fruit droops is clusters. The flowers are sweet…

<I>Aregelia spectabilis</I> has leaves that are ten to fifteen inches long. The flowers are milky, pale blue.

Aregelia Spectabilis

Aregelia spectabilis has leaves that are ten to fifteen inches long. The flowers are milky, pale blue.

The common names of <I>Arisaema triphyllum</I> are Jack-in-the-pulpit and Indian turnip. There are usually two leaves with oval leaflets. The spadix is club shaped.

Arisaema Triphyllum

The common names of Arisaema triphyllum are Jack-in-the-pulpit and Indian turnip. There are usually…

The leaves of <I>Aristolochia grandiflora</I> are heart shaped. The leaves taper to a point. The common names of aristolochia grandiflora are pelican flower, swan flower, goose flower, and duck flower.

Aristolochia Grandiflora

The leaves of Aristolochia grandiflora are heart shaped. The leaves taper to a point. The common names…

The common name of <I>Armeria vulgarism</I> is common thrift. The flowers are white, pink, or red. The leaves are linear.

Armeria Vulgaris

The common name of Armeria vulgarism is common thrift. The flowers are white, pink, or red. The leaves…

The common names of <I>Arnica montana</I> are mountain tobacco and mountain snuff. The plant is a foot high with a sparsely hairy stem. The leaves are oblong and taper to a point.

Arnica Montana

The common names of Arnica montana are mountain tobacco and mountain snuff. The plant is a foot high…

<I>Artabotrys uncinatus</I> is a climbing shrub with branches at a wide angle. The leaves are oblong and taper to a point. The flowers have six petals and are brownish red.

Artabotrys Uncinatus

Artabotrys uncinatus is a climbing shrub with branches at a wide angle. The leaves are oblong and taper…

The common name of <I>Artemisia vulgaris</I> is mugwort. The leaves are white and cottony beneath but green above. There are many oblong, yellow flower heads.

Artemisia Vulgaris

The common name of Artemisia vulgaris is mugwort. The leaves are white and cottony beneath but green…

The common names of <I>Arum maculatum</I> are lords-and-ladies, cuckoo-pint, and wake robin. The plant usually grows about one foot tall. The leaves are black spotted and triangular.

Arum Maculatum

The common names of Arum maculatum are lords-and-ladies, cuckoo-pint, and wake robin. The plant usually…

<I>Arum italicum</I> is larger than the maculatum variety. The leaves are triangular and light veined. The flower is yellowish or white.

Arum Italicum

Arum italicum is larger than the maculatum variety. The leaves are triangular and light veined. The…

The common name of <I>Asclepias tuberosa</I> is butterfly weed. It is also known as pleurisy root. The plant grows two to three feet tall. The leaves alternate and the roots are long and horizontal.

Asclepias Tuberosa

The common name of Asclepias tuberosa is butterfly weed. It is also known as pleurisy root. The plant…

Shown are the leaves and branches of common asparagus. Branches arise from part a and at b clusters of branchlets or leaves are shown.

Leaves and Branches of Asparagus

Shown are the leaves and branches of common asparagus. Branches arise from part a and at b clusters…

The common name of <I>Asperula odorata</I> is sweet woodruff. The plant grows between six and eight inches tall. The leaves usually grow in whorls of eight.

Asperula Odorata

The common name of Asperula odorata is sweet woodruff. The plant grows between six and eight inches…

The variegata variety of <I>Aspidistra lurida</I> has an alternation of green and white stripes making no two leaves exactly alike.

Variegata Variety of Aspidistra Lurida

The variegata variety of Aspidistra lurida has an alternation of green and white stripes making no two…

The common name of <I>Asplenium nidus</> is bird's nest fern. The fern has entire margined leaves. The veins are partly united to form a net.

Asplenium Nidus

The common name of Asplenium nidus is bird's nest fern. The fern has entire margined leaves. The veins…

<I>Asplenium myriophyllum</I> grows in extensive tufts with grayish brown stalks. The leaves are six to fifteen inches long.

Asplenium Myriophyllum

Asplenium myriophyllum grows in extensive tufts with grayish brown stalks. The leaves are six to fifteen…

The leaves of <I>Asplenium belangeria</I> are fifteen to eighteen inches long and three inches wide. There are twelve linear segments set nearly at right angles to the rachis.

Asplenium Belangeria

The leaves of Asplenium belangeria are fifteen to eighteen inches long and three inches wide. There…

<I>Aster macrophyllus</I> has a reddish, angular stem and grows about two and a half feet tall. The leaves are heart shaped.

Aster Macrophyllus

Aster macrophyllus has a reddish, angular stem and grows about two and a half feet tall. The leaves…

<I>Aster cordifolius</I> has a smooth stem with thin, rough, usually hairy leaves. The flowers heads are blue and numerous.

Aster Cordifolius

Aster cordifolius has a smooth stem with thin, rough, usually hairy leaves. The flowers heads are blue…

<I>Aster herveyi</I> grows two to three feet tall. The firm leaves are rough above and hairy on the veins beneath. The flowers heads are violet and numerous.

Aster Herveyi

Aster herveyi grows two to three feet tall. The firm leaves are rough above and hairy on the veins beneath.…

The stem of <I>Astilbe astilboides</I> grows two to three feet tall. The leaves are oval and oblong. The flowers are white and crowded in dense spikes.

Astilbe Astilboides

The stem of Astilbe astilboides grows two to three feet tall. The leaves are oval and oblong. The flowers…

The leaves of <I>Atalantia citrioides</I> are two to three and a half inches long and oval shaped.

Leaf of Atalantia Citrioides

The leaves of Atalantia citrioides are two to three and a half inches long and oval shaped.

<I>Atalantia ceylonica</I> is a spiny shrub or small tree native to India. The leaves grow up to three inches long. The inside of the fruit is dry.

Atalantia Ceylonica

Atalantia ceylonica is a spiny shrub or small tree native to India. The leaves grow up to three inches…

<I>Atriplex breweri</I> is a stout woody shrub that grows four to six feet tall. The leaves are silvery gray, oval shaped and oblong.

Atriplex Breweri

Atriplex breweri is a stout woody shrub that grows four to six feet tall. The leaves are silvery gray,…

Atropa belladonna is known as deadly nightshade. The plant is erect, branching, and leafy. The leaves are oval and pointed. The flowers grow single or in pairs.

Atropa Belladonna

Atropa belladonna is known as deadly nightshade. The plant is erect, branching, and leafy. The leaves…

Babiana stricta grow one foot or less tall. The leaves are broad and sword shaped. The flowers are scattered, showy, and usually red or purple.

Babiana Stricta

Babiana stricta grow one foot or less tall. The leaves are broad and sword shaped. The flowers are scattered,…

<I>Bactris minor</I> is a tall, slender stemmed palm that grows about forty feet tall. The tree has many dark colored spines. The leaves are about three feet long.

Bactris Minor

Bactris minor is a tall, slender stemmed palm that grows about forty feet tall. The tree has many dark…

The common name of <I>Balaka seemannii</I> is balaka. The tree grows eight to twelve feet high. The leaves are four feet long.

Balaka Seemannii

The common name of Balaka seemannii is balaka. The tree grows eight to twelve feet high. The leaves…

<I>Bambusa tessellata</I> is a variety of bamboo. It grows three to four feet tall. The leaves are smooth and twelve to fourteen inches long.

Bambusa Tessellata

Bambusa tessellata is a variety of bamboo. It grows three to four feet tall. The leaves are smooth and…

<I>Arundinaria japonica</I> is a variety of bamboo. It grows five to ten feet tall. The leaves are four to eight inches, or more, in length.

Arundinaria Japonica

Arundinaria japonica is a variety of bamboo. It grows five to ten feet tall. The leaves are four to…

<I>Banksia ericifolia</I> is a shrub or small tree, growing twelve to fourteen feet tall. The leaves grow hardly any longer than three quarters of an inch. The flowers are yellow.

Banksia Ericifolia

Banksia ericifolia is a shrub or small tree, growing twelve to fourteen feet tall. The leaves grow hardly…

<I>Barosma pulchella</I> grows three to four feet tall. The leaves are scattered and oval shaped. The flowers grow alone or in pairs.

Barosma Pulchella

Barosma pulchella grows three to four feet tall. The leaves are scattered and oval shaped. The flowers…

<I>Begonia socotrana</I> is a winter flowering species. The flowers are bright rose. The leaves are dark green and four to seven inches across.

Begonia Socotrana

Begonia socotrana is a winter flowering species. The flowers are bright rose. The leaves are dark green…

Begonia Gloire de Lorraine is a hybrid. The leaves are small and pure green. The flowers have four petals and are rose colored.

Begonia Gloire de Lorraine

Begonia Gloire de Lorraine is a hybrid. The leaves are small and pure green. The flowers have four petals…

The leaves of <I>Begonia davisii</I> are dull green and thinly hairy. The flowers are bright red.

Begonia Davisii

The leaves of Begonia davisii are dull green and thinly hairy. The flowers are bright red.