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"The common wormwood; a European species, much cultivated for its bitter qualities; it contains a volatile oil which is the principle ingredient in the French liquor absinthe."-Whitney, 1902

Absinthium

"The common wormwood; a European species, much cultivated for its bitter qualities; it contains a volatile…

"Abutilon macropodum. 1. an unexpanded flower; 2. the stamens and styles; 3. a ripe fruit, consisting of many carpels, whose upper extremities are free and radiant." -Lindley, 1853

Abutilon

"Abutilon macropodum. 1. an unexpanded flower; 2. the stamens and styles; 3. a ripe fruit, consisting…

"An Egyptian tree; the bark and pods are frequently used in tanning and the aqueous extract of the wood some Indian species forms the catechu of commerce."-Whitney, 1902

Acacia

"An Egyptian tree; the bark and pods are frequently used in tanning and the aqueous extract of the wood…

"A genus of small herbaceous plants of southern Europe and Africa; they have spinosely toothed leaves, and they are sometimes cultivated for the sake of their beautiful foliage."-Whitney, 1902

Acanthus

"A genus of small herbaceous plants of southern Europe and Africa; they have spinosely toothed leaves,…

"A genus of small herbaceous plants of southern Europe and Africa; they have spinosely toothed leaves, and they are sometimes cultivated for the sake of their beautiful foliage."-Whitney, 1902

Acanthus

"A genus of small herbaceous plants of southern Europe and Africa; they have spinosely toothed leaves,…

"A genus of small herbaceous plants of southern Europe and Africa; they have spinosely toothed leaves, and they are sometimes cultivated for the sake of their beautiful foliage."-Whitney, 1902

Acanthus

"A genus of small herbaceous plants of southern Europe and Africa; they have spinosely toothed leaves,…

"Nelsonia campestris. 1. flowers; 2. pistil; 3. capsule; 4. cross section of a seed." -Lindley, 1853

Acanthus

"Nelsonia campestris. 1. flowers; 2. pistil; 3. capsule; 4. cross section of a seed." -Lindley, 1853

An acanthus plant in front of a pedestal. Acanthus is a very common decorative plant.

Acanthus

An acanthus plant in front of a pedestal. Acanthus is a very common decorative plant.

"Bixa orellana. 1. a pistil and two stamens; 2. a cross section of the ovary; 3. a ripe fruit. 4. a cross section of a seed." -Lindley, 1853

Achiote

"Bixa orellana. 1. a pistil and two stamens; 2. a cross section of the ovary; 3. a ripe fruit. 4. a…

"Acicarpha spathulata. 1. section of an entire flower; 2. perpendicular section of ripe fruit." -Lindley, 1853

Acicarpha

"Acicarpha spathulata. 1. section of an entire flower; 2. perpendicular section of ripe fruit." -Lindley,…

Large herb with a very stout stem, often from 1 to 3dm in diameter at base, over 1.5m tall.

Acnida

Large herb with a very stout stem, often from 1 to 3dm in diameter at base, over 1.5m tall.

"a poisonous plant, monk's-hood, wolf's-bane."-Whitney, 1902

Aconite

"a poisonous plant, monk's-hood, wolf's-bane."-Whitney, 1902

The Winter Aconite (Eranthis hyemalis) is a European plant in the Ranunculaceae family of buttercups.

Winter Aconite

The Winter Aconite (Eranthis hyemalis) is a European plant in the Ranunculaceae family of buttercups.

Plants aromatic when crushed.

Acorus

Plants aromatic when crushed.

"Red Baneberry, showing flowering plant and fruiting raceme."-Whitney, 1902

Actaea

"Red Baneberry, showing flowering plant and fruiting raceme."-Whitney, 1902

Also known as Butcher's broom. A shrub with flat shoots that give the appearance of stiff, spine-tipped leaves. It has been known to enhance blood flow to the brain, legs, and hands, and has been used to relieve constipation and water retention.

Ruscus Aculeatus

Also known as Butcher's broom. A shrub with flat shoots that give the appearance of stiff, spine-tipped…

Tapering at the end.

Acuminate

Tapering at the end.

Terminating with a sharp point.

Acute

Terminating with a sharp point.

"Adder's tongue fern (Ophioglossum vulgatum L.). R, runner or stolon." -Gager, 1916

Southern Adderstongue

"Adder's tongue fern (Ophioglossum vulgatum L.). R, runner or stolon." -Gager, 1916

Ophioglossum vulgatum, or Southern Adderstongue is a fern-like plant commonly growing in sand dunes.

Southern Adderstongue

Ophioglossum vulgatum, or Southern Adderstongue is a fern-like plant commonly growing in sand dunes.

"Adlumia cirrhosa; single leaf and panicle"-Whitney, 1902

Adlumia

"Adlumia cirrhosa; single leaf and panicle"-Whitney, 1902

"Adnate Anther, Adnate Stipule."-Whitney, 1902

Adnate

"Adnate Anther, Adnate Stipule."-Whitney, 1902

A crowded species of sugar cane. The branches grow up to 12 inches in length, and the stems up to 7 feet high. It is native to Algeria.

Saccharum Aegyptiacum

A crowded species of sugar cane. The branches grow up to 12 inches in length, and the stems up to 7…

Littaea geminiflora, or the Twin-Flowered Agave, showing the flower and the whole plant.

Twin-Flowered Agave

Littaea geminiflora, or the Twin-Flowered Agave, showing the flower and the whole plant.

Marlea begonifolia or Alangium chinense is an evergreen tree native in China used for its medicinal purposes.

Alangium

Marlea begonifolia or Alangium chinense is an evergreen tree native in China used for its medicinal…

Also known as Salix alaxensis. The branch of an Alaska Willow tree, a species of willow.

Branch of Alaska Willow

Also known as Salix alaxensis. The branch of an Alaska Willow tree, a species of willow.

Blossom of an alfalfa plant, one of the oldest types of hay currently grown.

Alfalfa blossoms

Blossom of an alfalfa plant, one of the oldest types of hay currently grown.

Fruits borne in a ring; stamens 6; inflourescences much branched.

Alisma

Fruits borne in a ring; stamens 6; inflourescences much branched.

Leaf, when examined with hand lends, not showing zones.

Alismaceae

Leaf, when examined with hand lends, not showing zones.

Leaves with several prominent rib-like veins running from base to apex.

Alismaceae

Leaves with several prominent rib-like veins running from base to apex.

Leaves with several very prominent ribs running from base to apex.

Alismaceae

Leaves with several very prominent ribs running from base to apex.

"Pimento or Jamaica pepper, otherwise called allspice, is a small berry, the fruit of a beautiful tree, abut thirty feet high, with a straight trunk much branched above covered with a smooth, gray bark." -Lupton

Allspice

"Pimento or Jamaica pepper, otherwise called allspice, is a small berry, the fruit of a beautiful tree,…

The almond is native to Iran, from northwestern Saudi Arabia, north through western Jordan, Israel, Lebanon, western Syria, to southern Turkey. It is a small deciduous tree, growing to between 4 and 10 meters in height, with a trunk of up to 30 centimeters in diameter. The young shoots are green at first, becoming purplish where exposed to sunlight, then grey in their second year. The leaves are 1 cm long and 1.2–4 cm broad, with a serrated margin and a 2.5 cm petiole. The flowers are white or pale pink, 3–5 cm diameter with five petals, produced singly or in pairs before the leaves in early spring. The fruit is a drupe 3.5–6 cm long, with a downy outer coat. The outer covering or exocarp, (fleshy in other members of Prunus such as the plum and cherry), is instead a leathery grey-green coating called the hull, which contains inside a hard shell, and the edible seed, commonly called a nut in culinary terms. Generally, one seed is present, but occasionally there are two. In botanical terms, an almond is not a true nut. The reticulated hard woody shell (like the outside of a peach pit) surrounding the edible seed is called the endocarp. The fruit is mature in the autumn, 7–8 months after flowering.

Almond Tree and Fruit

The almond is native to Iran, from northwestern Saudi Arabia, north through western Jordan, Israel,…

Buds with a single scale; fruit cone-like.

Alnus

Buds with a single scale; fruit cone-like.

The branch of an Alnus oregona, a species of alder tree.

Branch of Alnus Oregona

The branch of an Alnus oregona, a species of alder tree.

The branch of an Alnus sitchensis, a species of Alder tree.

Branch of Alnus Sitchensis

The branch of an Alnus sitchensis, a species of Alder tree.

"A drug of great antiquity, for we find Dioscorides make mention of aloe as a substance obtained from a plant, and possessing cathartic properties." — Chambers' Encyclopedia, 1875

Aloe

"A drug of great antiquity, for we find Dioscorides make mention of aloe as a substance obtained from…

A member of the primulaceae which is a native plant to Pyrenees.

Soldanella Alpina

A member of the primulaceae which is a native plant to Pyrenees.

Usually pertains to leaves. Not opposite each other but bourne singly at different levels on the stem.

Alternate

Usually pertains to leaves. Not opposite each other but bourne singly at different levels on the stem.

Flowers in stalked head-like spikes; leaves over 3.5cm long.

Alternanthera

Flowers in stalked head-like spikes; leaves over 3.5cm long.

The branch of an Amelanchier obovalis tree, native to North America.

Branch of Amelanchier Obovalis

The branch of an Amelanchier obovalis tree, native to North America.

Stiff plants with large, thick leaves. It is said to have medicinal purposes for burned or damaged skin.

American Aloe

Stiff plants with large, thick leaves. It is said to have medicinal purposes for burned or damaged skin.

Also known as Castanea dentata. The branch of an American Chestnut tree, native to eastern North America.

Branch of American Chestnut

Also known as Castanea dentata. The branch of an American Chestnut tree, native to eastern North America.

Also known as Ulmus americana. The branch of the American Elm, native to eastern North America.

Branch of American Elm

Also known as Ulmus americana. The branch of the American Elm, native to eastern North America.

Also known as Ostrya virginiana. The branch of an American Hophornbeam, a species of Ostrya native to eastern North America.

Branch of American Hophornbeam

Also known as Ostrya virginiana. The branch of an American Hophornbeam, a species of Ostrya native to…

Also known as Carpinus caroliniana. The branch of an American Hornbeam, native to eastern North America.

Branch of American Hornbeam

Also known as Carpinus caroliniana. The branch of an American Hornbeam, native to eastern North America.

One of five stamen-clusters of the flower of American Linden, with accompanying scale.

American Linden

One of five stamen-clusters of the flower of American Linden, with accompanying scale.

Also known as Sorbus americana. The branch of an American Mountain-Ash tree, native to northeastern North America.

Branch of American Mountain-Ash

Also known as Sorbus americana. The branch of an American Mountain-Ash tree, native to northeastern…

Also known as Liquidambar styraciflua. The branch of an American Sweetgum tree, native to eastern North America.

Branch of American Sweetgum

Also known as Liquidambar styraciflua. The branch of an American Sweetgum tree, native to eastern North…

Also known as Salix discolor. The branch of an American Willow, native throughout North America.

Branch of America Willow

Also known as Salix discolor. The branch of an American Willow, native throughout North America.

Flowers not showy, in axils of leaves, mostly purple.

Ammannia

Flowers not showy, in axils of leaves, mostly purple.

A compund leaf.

Ampelopsis

A compund leaf.

Leaves leathery, toothed only near the apex.

Ampelothamnus

Leaves leathery, toothed only near the apex.

A perennial flower with white petals and green foliage. They tend to bloom in April and May, and are found in the Western Alps.

Ranunculus Amplexicaulis

A perennial flower with white petals and green foliage. They tend to bloom in April and May, and are…

Leaves usually three in whorls (sometimes four); flowers minute and inconspicuous

Anacharis

Leaves usually three in whorls (sometimes four); flowers minute and inconspicuous

Spores borne in sacs on lower leaf surface; divisions of the leaf small, less than 2 cm long.

Anchistea

Spores borne in sacs on lower leaf surface; divisions of the leaf small, less than 2 cm long.

"Andrea nivalis, natural size; 2. the same much magnified; 3. spore-case with the torn calyptra; 4. spore-case after the discharge of the spores; 5. columella with a few spores adhering." -Lindley, 1853

Andrea nivalis

"Andrea nivalis, natural size; 2. the same much magnified; 3. spore-case with the torn calyptra; 4.…

The moss, Andraea rupestris much magnified.

Andreaea Moss

The moss, Andraea rupestris much magnified.

A type of flower.

Anemone

A type of flower.

"A genus of plants of the natural order Ranunculaceae, having an involucre of three divided leaves, more or less remote from the flower, a petaloid calyx, searcely distinguishable from the corolla, and soft woolly achenia, which in some species have tails." — Chambers' Encyclopedia, 1875

Anemone Coronaria

"A genus of plants of the natural order Ranunculaceae, having an involucre of three divided leaves,…