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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.…

Aphelandra cristata is a flowering plant shown potted here because it is often used as a houseplant.

Aphelandra

Aphelandra cristata is a flowering plant shown potted here because it is often used as a houseplant.

The leopoldii variety of <I>Aphelandra squarrosa</I> is showy with yellow flowers.

Leopoldii Variety of Aphelandra Squarrosa

The leopoldii variety of Aphelandra squarrosa is showy with yellow flowers.

<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…

The common names of <I>Apios tuberosa</I> are groundnut and wild bean. The plant grows between four and eight feet tall. The flowers are fragrant and chocolate brown.

Apios Tuberosa

The common names of Apios tuberosa are groundnut and wild bean. The plant grows between four and eight…

The common names of<I>Aplectrum hyemale</I> are putty root and Adam-and-Eve. The pods are oblong and pointed. The flowers a large and greenish brown.

Fruit of Aplectrum Hyemale

The common names ofAplectrum hyemale are putty root and Adam-and-Eve. The pods are oblong and pointed.…

An apple blossom, just right to spray for coddling moth.

Apple blossom

An apple blossom, just right to spray for coddling moth.

Pictured are the flower cluster and the leaf cluster of an apple tree.

Flower and Leaf Cluster of Apple

Pictured are the flower cluster and the leaf cluster of an apple tree.

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.

"Aptandra Spruceana. 1. an expanded flower; 2. a petal; 3. tube of stamens, with 4 petaloid glands at the base; 4. pistil; 5. section of ovary." -Lindley, 1853

Aptandra

"Aptandra Spruceana. 1. an expanded flower; 2. a petal; 3. tube of stamens, with 4 petaloid glands at…

"An aquarium well filled and stocked with plants, fish, etc., is one of the finest ornaments one can have in the room."&mdash;Heinrich, 1887

The Aquarium

"An aquarium well filled and stocked with plants, fish, etc., is one of the finest ornaments one can…

The orders pictured are aquifoliaceae, celastraceae, stackhousiaceae, and staphyleaceae. The flowers of these orders that are illustrated include (1) ilex, (2) euonymus, (3) stackhousia, and (4) staphylea.

Orders of Aquifoliaceae, Celastraceae, Stackhousiaceae, and Staphyleaceae

The orders pictured are aquifoliaceae, celastraceae, stackhousiaceae, and staphyleaceae. The flowers…

"Aquilaria Agallochum. 1. a flower; 2. the same split open; 3. a section of the ovary." -Lindley, 1853

Aquilaria

"Aquilaria Agallochum. 1. a flower; 2. the same split open; 3. a section of the ovary." -Lindley, 1853

"Inflorescence of Aquilegia vulgaris (garden columbine). a, flower; b, same, cut vertically; c, pistils."-Whitney, 1902

Aquilegia

"Inflorescence of Aquilegia vulgaris (garden columbine). a, flower; b, same, cut vertically; c, pistils."-Whitney,…

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…

The common name of aquilegia canadensis is common columbine. The plant grows one to two feet tall. There are several flowers to a stem. The flowers are yellow tinted with red.

Aquilegia Canadensis

The common name of aquilegia canadensis is common columbine. The plant grows one to two feet tall. There…

<I>Aquilegia chrysantha</I> grows between three and four feet tall. There are many flowers on the plant. The flowers are two to three inches across and are yellow tinted with red.

Aquilegia Chrysantha

Aquilegia chrysantha grows between three and four feet tall. There are many flowers on the plant. The…

<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 <I>Aquilegia longissima</I> plant is tall and covered in silky hairs. The flowers are pale yellow. The leaflets are deeply lobed and cut.

Aquilegia Longissima

The Aquilegia longissima plant is tall and covered in silky hairs. The flowers are pale yellow. The…

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…

Pictured from the araceae order are (1) arisaema, spathe and spadix, and (2) arum spadix with male and female flowers. Pictured from the lemnaceae order are (3) lemna, (3a) whole plants, and (3b) male and female flowers, and spathe. Pictured from the bromeliaceae order is (4) bromelia flower, (5) ananas, (5a) fruiting inflorescence, and (5b) floral diagram. Pictured from the commelinaceae order is (6) commelina flower and (7) tradescantia flower.

Araceae, Lemnaceae, Bromeliaceae, and Commelinaceae Orders

Pictured from the araceae order are (1) arisaema, spathe and spadix, and (2) arum spadix with male and…

Pictured are flowers of the orders araliaceae and umbelliferae. The flowers of these orders that are illustrated include (1) aralia, (2) hedera, (3) cicutat, (4) foeniculum, (5) artedia, and (6) apium. (7) represents the fruits of umbelliferae.

Orders of Araliaceae and Umbelliferae

Pictured are flowers of the orders araliaceae and umbelliferae. The flowers of these orders that are…

An evergreen shrub with bright red flowers. It usually reaches between 20 and 25 feet, and is commonly found in Thailand, Nepal, and India.

Rhododendron Arboreum

An evergreen shrub with bright red flowers. It usually reaches between 20 and 25 feet, and is commonly…

<I>Arctotis grandis</I> forms a bushy clump between two and two and a half feet tall. The flowers are white or white and pale violet.

Arctotis Grandis

Arctotis grandis forms a bushy clump between two and two and a half feet tall. The flowers are white…

<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>Arenaria grandiflora</I> grows ten inches or less high. The flowers are large and grow solitary or in twos or threes.

Arenaria Grandiflora

Arenaria grandiflora grows ten inches or less high. The flowers are large and grow solitary or in twos…

<I>Arethusa bulbosa</I> is a pretty orchid that grows between eight and ten inches tall. The flowers is a bright, rose-pink.

Arethusa Bulbosa

Arethusa bulbosa is a pretty orchid that grows between eight and ten inches tall. The flowers is a bright,…

"1. Aretia Vitaliana; 2. a flower cut open; 3. the pistil; 4. a vertical section of the latter, showing the free central placenta; 5. a section of a seed." -Lindley, 1853

Aretia

"1. Aretia Vitaliana; 2. a flower cut open; 3. the pistil; 4. a vertical section of the latter, showing…

<I>Argemone grandiflora</I> grows one to three feet tall and has very few prickles. Three to six flowers grow together. The flowers are four inches across.

Argemone Grandiflora

Argemone grandiflora grows one to three feet tall and has very few prickles. Three to six flowers grow…

The common name of <I>Argemone mexicana</I> is prickly poppy. The plant grow one to two feet tall. The flowers are orange or lemon colored. The plant has a moderately prickly stem.

Argemone Mexicana

The common name of Argemone mexicana is prickly poppy. The plant grow one to two feet tall. The flowers…

The <I>Ariocarpus lloydii</I> plant has a rounded top that is four inches or more in diameter. The flowers are purple and slightly longer than one inch.

Ariocarpus Lloyd

The Ariocarpus lloydii plant has a rounded top that is four inches or more in diameter. The flowers…

The arisaema triphylla flower has four to six inch long spathes. The spathes are striped with lines of purplish-brown

Arisaema Triphylla Flower

The arisaema triphylla flower has four to six inch long spathes. The spathes are striped with lines…

A yellow flower with small pink florets. They are generally around 1 foot in height.

Podolepis Aristata

A yellow flower with small pink florets. They are generally around 1 foot in height.

The common names of <I>Aristolochia macrophylla</I> are dutchman's pipe and pipe vine. The flowers are u-shaped and purplish. The flowers are enlarged above the ovary. The ovary is labeled "a" and the swelling of the calyx-tube is labeled "b".

Aristolochia Macrophylla

The common names of Aristolochia macrophylla are dutchman's pipe and pipe vine. The flowers are u-shaped…

Pictured is the longitudinal section of <I>Aristolochia macrophylla</I>. Shown is the ovary and the short column of stamens. The common names of the plant are dutchman's pipe and pipe vine.

Aristolochia Macrophylla

Pictured is the longitudinal section of Aristolochia macrophylla. Shown is the ovary and the short column…

Shown are the Aristolochiaceae, Polygonaceae, Chenopodiaceae, and Amarantaceae orders. Also illustrated are the asarum, aristolochia, fagopyrum, chenopodium, and achyranthes flowers of these orders.

Aristolochiaceae, Polygonaceae, Chenopodiaceae, and Amarantaceae Orders

Shown are the Aristolochiaceae, Polygonaceae, Chenopodiaceae, and Amarantaceae orders. Also illustrated…

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…

This plant belongs to caryophyllaceae.

Silene Armeria

This plant belongs to caryophyllaceae.

A flower that is used for medicinal purposes, mostly for treatment of bruises.

Arnica

A flower that is used for medicinal purposes, mostly for treatment of bruises.

"A genus of plants belonging to the natural order compositae, sub-order Corymbiferae. The flowers of the ray are female and ligulate, those of the disk hermaphrodite and tubular. The receptacle is naked; the pappus hairy. The root, leaves, and flowers of the Mountain Tobacco are much valued in medicine, and administers in various forms as a stimulant in paralytic affections, typhoid fevers, and other diseases." &mdash; Chambers' Encyclopedia, 1875

Arnica Montana

"A genus of plants belonging to the natural order compositae, sub-order Corymbiferae. The flowers of…

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…

The common name of arnica montana is Mountain Tobacco. The flower heads are yellow with three or four growing together.

Habit and Flower-Head of Arnica Montana

The common name of arnica montana is Mountain Tobacco. The flower heads are yellow with three or four…

"Arnotto-extremely common in Jamaica and other parts of the West Indies, and has been introduced into tropical regions of the old world."-Whitney, 1902

Arnotto

"Arnotto-extremely common in Jamaica and other parts of the West Indies, and has been introduced into…

<I>Arpophyllum spicatum</I> has stems that grow up to eight inches tall. The flowers are numerous and grow a half inch across. The flowers are rose-purple with a bright purple lip.

Arpophyllum Spicatum

Arpophyllum spicatum has stems that grow up to eight inches tall. The flowers are numerous and grow…

"A plant of the natural order Umbelliefrae, a native of the elevated table-lands in the neighborhood of Santa Fe de Bogota and Caracas, and of regions of similar climate in other parts of Tropical America. It is much cultivated in its native country for its roots, which are used as an esculent. The root divides into a number of parts, which resemble cows' horns or large carrots. When boiled, they are firm and tender, with a flavor not so strong as that of a parsnip." &mdash; Chambers' Encyclopedia, 1875

Arracacha

"A plant of the natural order Umbelliefrae, a native of the elevated table-lands in the neighborhood…

"Arrow-root (M. arundinacea). a, tubers; b, leaf and flowers; c, stamen and style." &mdash; Chambers' Encyclopedia, 1875

Arrow-root

"Arrow-root (M. arundinacea). a, tubers; b, leaf and flowers; c, stamen and style." — Chambers'…

"Triglochin palustre. 1. A flower; 3. a ripe fruit; 4. one ripe carpel opened and exhibiting a seed; 5. embryo." -Lindley, 1853

Arrowgrass

"Triglochin palustre. 1. A flower; 3. a ripe fruit; 4. one ripe carpel opened and exhibiting a seed;…

An aquatic plant of the Sagittaria genus.

Arrowhead

An aquatic plant of the Sagittaria genus.

Also known as Sagittaria sagittifolia. It is a flowering plant that is native to the wetlands of Europe and Asia. The leaves are arrow-shaped and the flowers generally have three white petals with numerous purple stamens.

Arrowhead

Also known as Sagittaria sagittifolia. It is a flowering plant that is native to the wetlands of Europe…

A plant whose starchy compounds for treating poison arrow wounds

Arrowroot

A plant whose starchy compounds for treating poison arrow wounds

The flower of Arrudea clusioides from the family Clusiaceae.

Arrudea

The flower of Arrudea clusioides from the family Clusiaceae.

<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…

<I>Artemisia lactiflora</I> is a white flowered form of mugwort. It is a beautiful plant with fragrant foliage.

Artemisia Lactiflora

Artemisia lactiflora is a white flowered form of mugwort. It is a beautiful plant with fragrant foliage.

The common name of <I>Artemisia pontica</I> is Roman wormwood. The plant is shrubby and erect, growing between one and four feet tall. The flower heads are small and whitish yellow.

Artemisia Pontica

The common name of Artemisia pontica is Roman wormwood. The plant is shrubby and erect, growing between…

The common names of <I>Artemisia stelleriana</I> are old woman, dusty miller, and beach wormwood. The plant grows two feet tall and has a woody, creeping base.

Artemisia Stelleriana

The common names of Artemisia stelleriana are old woman, dusty miller, and beach wormwood. The plant…

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…

A perennial thistle with arching green leaves and edible flowers.

Artichoke

A perennial thistle with arching green leaves and edible flowers.

A species of sunflower cultivated for its tuber, which is used as a root vegetable.

Jerusalem Artichoke

A species of sunflower cultivated for its tuber, which is used as a root vegetable.

Arum Dracunculus, sometimes known as the Dragon Arum, has a large purple spathe. This variety of arum grows in the south of Europe.

Arum Dracunculus

Arum Dracunculus, sometimes known as the Dragon Arum, has a large purple spathe. This variety of arum…

<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…