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A key or key-fruit (called by Botanists a Samara) is like an akene or nut, only it is winged.

Key

A key or key-fruit (called by Botanists a Samara) is like an akene or nut, only it is winged.

A key or key-fruit (called by Botanists a Samara) is like an akene or nut, only it is winged. This is a pair of keys.

Key

A key or key-fruit (called by Botanists a Samara) is like an akene or nut, only it is winged. This is…

This is a classification of a type of fruit.

Key Fruit of Ash

This is a classification of a type of fruit.

Catha edulis or Khat is a flowering plant of the Celastraceae family.

Khat

Catha edulis or Khat is a flowering plant of the Celastraceae family.

"Kielmeyera rosea. 1. the pistil; 2. a transverse section of it; 3. a ripe fruit; 4. embryo." -Lindley, 1853

Kielmeyera

"Kielmeyera rosea. 1. the pistil; 2. a transverse section of it; 3. a ripe fruit; 4. embryo." -Lindley,…

From left to right: Serrate, Dentate, Crenate, Wavy, Sinuate, Incised.

Kinds of Margin of Leaves

From left to right: Serrate, Dentate, Crenate, Wavy, Sinuate, Incised.

"a, flower of Caltha palustris, showing the petaloid sepals s." -Whitney, 1911

Kingcup

"a, flower of Caltha palustris, showing the petaloid sepals s." -Whitney, 1911

"b, one of the sepals" of the flower of Caltha palustris, or Kingcup. -Whitney, 1911

Kingcup Sepal

"b, one of the sepals" of the flower of Caltha palustris, or Kingcup. -Whitney, 1911

"Knight's experiment, substituting centrifugal "force" for gravity" proved that stems do not grow upwards because of sunlight but rather, roots grow downwards because of gravity. -Gager, 1916

Knight's Experiment

"Knight's experiment, substituting centrifugal "force" for gravity" proved that stems do not grow upwards…

A type of flower.

Laburnum

A type of flower.

"Lacistema serrulatum. 1. amentum in flower; 2. pistil and stamen. 3. pistil and calyx; 4. fruit in its state of dehiscence." -Lindley, 1853

Lacistema

"Lacistema serrulatum. 1. amentum in flower; 2. pistil and stamen. 3. pistil and calyx; 4. fruit in…

Style of a Lady's Slipper (Cypripedium), and stamens united with it; the anther of the two good stamens; an abortive stamen, what should be its anther changed into a petal-like body; the stigma.

Lady's Slipper

Style of a Lady's Slipper (Cypripedium), and stamens united with it; the anther of the two good stamens;…

A piece of stem of Larch with two clusters (fascicles) of numerous leaves.

Larch

A piece of stem of Larch with two clusters (fascicles) of numerous leaves.

"Lardizabala triternata. 1. petals and stamens of male flower; 2. carpels; 3. fruit of a Lardizabala; 4. a cross section of it; 5. a seed; 6. a section of it, showing the embryo." -Lindley, 1853

Lardizabala

"Lardizabala triternata. 1. petals and stamens of male flower; 2. carpels; 3. fruit of a Lardizabala;…

Caulicle with plumule developed into internodes and pair of leaves.

Large Common Bean Seedling

Caulicle with plumule developed into internodes and pair of leaves.

This shows the fruiting ament of Large-toothed Aspen, Populus grandidentata, (Keeler, 1915).

Large-Toothed Aspen Flowers

This shows the fruiting ament of Large-toothed Aspen, Populus grandidentata, (Keeler, 1915).

Flower of Larkspur, (Gray, 1858).

Larkspur

Flower of Larkspur, (Gray, 1858).

Four petals of Larkspur, (Gray, 1858).

Larkspur

Four petals of Larkspur, (Gray, 1858).

A type of flower.

Larkspur

A type of flower.

"Follicle. Fruit of Larkspur. A dry one-celled seed-vessel consisting of a single carpel, and dehiscent only by the ventral suture, as in the milkweed and larkspur." -Whitney, 1911

Larkspur Follicle

"Follicle. Fruit of Larkspur. A dry one-celled seed-vessel consisting of a single carpel, and dehiscent…

The Delphinium tricorne or Dwarf Larkspur: "1. petals and stamens; 2. carpels; 3. a branch of ripe fruit." -Lindley, 1853

Dwarf Larkspur

The Delphinium tricorne or Dwarf Larkspur: "1. petals and stamens; 2. carpels; 3. a branch of ripe fruit."…

"Melastoma polyanthum. 1. flower; 2, 2. stamens; 3. base of anther; 4. fruit; 5. section of ditto; 6. seed." -Lindley. 1853

Native Lassiandra

"Melastoma polyanthum. 1. flower; 2, 2. stamens; 3. base of anther; 4. fruit; 5. section of ditto; 6.…

Leaf of Lathyrus Aphaca, consisting of a pair of stipules and a tendrils.

Lathyrus Aphaca

Leaf of Lathyrus Aphaca, consisting of a pair of stipules and a tendrils.

"1. Leaf of Ouvirandra fenestralis; 2. a flower cut open; 3. section of a ripe carpel of O. Bernieriana; 4, 5. embryo in different positions: the thicker part is cotyledon, the smaller the plumule." -Lindley, 1853

Lattice Leaf Plant

"1. Leaf of Ouvirandra fenestralis; 2. a flower cut open; 3. section of a ripe carpel of O. Bernieriana;…

Flower of Laurel-Magnolia, (Gray, 1858).

Laurel

Flower of Laurel-Magnolia, (Gray, 1858).

The Laurel cone of fruit, the seeds hanging as they drop, (Gray, 1858).

Laurel

The Laurel cone of fruit, the seeds hanging as they drop, (Gray, 1858).

"Cassytha filiformis. 1. a flower; 2. a fruit; 3. a section of it transversely." -Lindley, 1853

Laurel Dodder

"Cassytha filiformis. 1. a flower; 2. a fruit; 3. a section of it transversely." -Lindley, 1853

Here is leaf that is shaped like the head of an arrow.

Leaf

Here is leaf that is shaped like the head of an arrow.

Here is leaf that is shaped like a lance.

Leaf

Here is leaf that is shaped like a lance.

Here is leaf that is shaped like a trowel.

Leaf

Here is leaf that is shaped like a trowel.

Here is leaf that is shaped like a fiddle.

Leaf

Here is leaf that is shaped like a fiddle.

Here is a leaf that is shaped like a shield.

Leaf

Here is a leaf that is shaped like a shield.

Here is a leaf that has a tendril on the end of it which clasps around whatever it touches.

Leaf

Here is a leaf that has a tendril on the end of it which clasps around whatever it touches.

This leaf is notched all around its edge.

Leaf

This leaf is notched all around its edge.

This leaf is notched all around its edge.

Leaf

This leaf is notched all around its edge.

This leaf is spread out like a hand.

Leaf

This leaf is spread out like a hand.

This leaf is spread out like a hand.

Leaf

This leaf is spread out like a hand.

Leaves are arranged in a great many different ways on their stems. Here are three leaves together on a stem.

Leaf

Leaves are arranged in a great many different ways on their stems. Here are three leaves together on…

Leaves are arranged in a great many different ways on their stems. Here the leaf-stem has three little branches, and each branch has three leaves.

Leaf

Leaves are arranged in a great many different ways on their stems. Here the leaf-stem has three little…

Leaves are arranged in a great many different ways on their stems. On this leaf-stem are a great many leaves.

Leaf

Leaves are arranged in a great many different ways on their stems. On this leaf-stem are a great many…

This shows an lanceolate leaf.

Lanceolate Leaf Shape

This shows an lanceolate leaf.

This shows an obovate leaf.

Leaf

This shows an obovate leaf.

"Lizard's tail (Saururus cernuus). Portions of leaf-epidermis; U, upper epidermis; L, lower epidermis; ep, epidermal cell; st, guard-cells of the stomata." -Gager, 1916

Leaf Epidermis

"Lizard's tail (Saururus cernuus). Portions of leaf-epidermis; U, upper epidermis; L, lower epidermis;…

"A greatly magnified view of a perpendicular section of Parmelia aipolia, showing the thecae in the shield, a; b, the hypothecium and some gonidia beneath it; c, the medullary region; and d, the gonimic layer." -Lindley, 1853

Leaf Lichen

"A greatly magnified view of a perpendicular section of Parmelia aipolia, showing the thecae in the…

This is an example of an awl-shaped leaf.

Awl-shaped Leaf

This is an example of an awl-shaped leaf.

This is an example of a pinnately cleft leaf.

Cleft Leaf

This is an example of a pinnately cleft leaf.

This is an example of a palmately cleft leaf.

Cleft Leaf

This is an example of a palmately cleft leaf.

This is an example of a compound leaf. Pinnate leaves have their leaflets arranged along the sides of the main footstalk.

Compound Leaf

This is an example of a compound leaf. Pinnate leaves have their leaflets arranged along the sides of…

This is an example of a compound leaf. Pinnate leaves have their leaflets arranged along the sides of the main footstalk.

Compound Leaf

This is an example of a compound leaf. Pinnate leaves have their leaflets arranged along the sides of…

This is an example of a compound leaf. Pinnate leaves have their leaflets arranged along the sides of the main footstalk.

Compound Leaf

This is an example of a compound leaf. Pinnate leaves have their leaflets arranged along the sides of…

This is an example of a compound leaf. Palmate leaves have their leaflets arranged on the very end of the footstalk.

Compound Leaf

This is an example of a compound leaf. Palmate leaves have their leaflets arranged on the very end of…

This is an example of a twice-pinnate leaf of the Honey-locust.

Compound Leaf

This is an example of a twice-pinnate leaf of the Honey-locust.

This is an example of a decompound leaf structure, meaning it is divided three or four times.

Compound Leaf

This is an example of a decompound leaf structure, meaning it is divided three or four times.

Cross section of a leaf, showing the breathing pores and intercellular spaces. The small dots are grains of chlorophyll.

Cross-section of a leaf

Cross section of a leaf, showing the breathing pores and intercellular spaces. The small dots are grains…

This is an example of a pinnately divided leaf.

Divided Leaf

This is an example of a pinnately divided leaf.

This is an example of a palmately divided leaf.

Divided Leaf

This is an example of a palmately divided leaf.

This is the leaf of the common fern, or brake. On the back of the leaf are spores.

Fern Leaf

This is the leaf of the common fern, or brake. On the back of the leaf are spores.

Cross section of leaf of lily, somewhat diagrammatic: e, upper epidermis,s, stomata in cross-section, p, palisade layer

Lily Leaf

Cross section of leaf of lily, somewhat diagrammatic: e, upper epidermis,s, stomata in cross-section,…

This is an example of a pinnately lobed leaf.

Lobed Leaf

This is an example of a pinnately lobed leaf.

This is an example of a palmately lobed leaf.

Lobed Leaf

This is an example of a palmately lobed leaf.