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The pitcher plant is remarkable for having the end of its leaf turned up so as to form a complete pitcher, filled with water, and covered with a lid. This design helps it to trap unsuspecting insects that are then digested.

Pitcher plant

The pitcher plant is remarkable for having the end of its leaf turned up so as to form a complete pitcher,…

An evergreen vine which attaches itself to the ground like ivy. The betel pepper has larger berries than most peppers. In the East Indies and South Pacific inhabitants consider the betel pepper as a necessity of life, and the leaf, with quicklime and the areca nut is chewed.

Betel pepper

An evergreen vine which attaches itself to the ground like ivy. The betel pepper has larger berries…

Walking sticks lead a sluggish life among the branches of shrubs, living on the young shoots. Their color and shape being so much like those of things around them, enable them commonly to escape observation.

Walking Stick

Walking sticks lead a sluggish life among the branches of shrubs, living on the young shoots. Their…

Walking Sticks and Leaf Insects lead a sluggish life among the branches of shrubs, living on the young shoots. Their color and shape being so much like those of things around them, enable them commonly to escape observation.

Leaf Insect

Walking Sticks and Leaf Insects lead a sluggish life among the branches of shrubs, living on the young…

Floral divider with horseshoe

Floral divider with horseshoe

Floral divider with horseshoe

Diagram of a mesophyll cell of a leaf: c, chloroplast; n, nucleus; v, vacuole; w, cell wall.

Plant Cell

Diagram of a mesophyll cell of a leaf: c, chloroplast; n, nucleus; v, vacuole; w, cell wall.

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,…

Gland(g) from the upper surface of the leaf of lilac: e, epidermis, c, cuticle, p, palisade cells.

Gland

Gland(g) from the upper surface of the leaf of lilac: e, epidermis, c, cuticle, p, palisade cells.

Section through a petal of buttercup (Ranunculus), showing nectar gland (n). Note bundle of conducting tissues.

Petal

Section through a petal of buttercup (Ranunculus), showing nectar gland (n). Note bundle of conducting…

Ending of a xylem strand among the cells of the mesophyll in a leaf of lilac; t, tracheid; i, intercellular space.

Xylem

Ending of a xylem strand among the cells of the mesophyll in a leaf of lilac; t, tracheid; i, intercellular…

Galls on leaf of rose. The location of a parasite is often marked by swellings of peculiar and fantastic or beautiful forms (galls) that grow on leaves and stems.

Gall

Galls on leaf of rose. The location of a parasite is often marked by swellings of peculiar and fantastic…

Galls on leaf of rose. The location of a parasite is often marked by swellings of peculiar and fantastic or beautiful forms (galls) that grow on leaves and stems.

Gall

Galls on leaf of rose. The location of a parasite is often marked by swellings of peculiar and fantastic…

The pitcher plant is remarkable for having the end of its leaf turned up so as to form a complete pitcher, filled with water, and covered with a lid. This design helps it to trap unsuspecting insects that are then digested.

Pitcher Plant

The pitcher plant is remarkable for having the end of its leaf turned up so as to form a complete pitcher,…

Leaf of Mimosa in open position.

Mimosa

Leaf of Mimosa in open position.

Leaf of Mimosa in closed position.

Mimosa

Leaf of Mimosa in closed position.

Leaf of sundew with half of the tentacles inflexed from stimulation.

Sundew

Leaf of sundew with half of the tentacles inflexed from stimulation.

the "flower" of this plant is actually a modified leaf spathe.

Jack-in-the-Pulpit

the "flower" of this plant is actually a modified leaf spathe.

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…

Here is a leaf of the pitcher plant. You see that it has an opening at the upper end. It can hold considerable water.

Pitcher Plant Leaf

Here is a leaf of the pitcher plant. You see that it has an opening at the upper end. It can hold considerable…

Here is a leaf of the Venus's fly trap which is a spring trap for flies and other insects. Here you see the leaf as it is spread out, wide open.

Venus Fly Trap Leaf

Here is a leaf of the Venus's fly trap which is a spring trap for flies and other insects. Here you…

Here is a leaf of the Venus's fly trap which is a spring trap for flies and other insects. The two parts of the leaf close together and the points on the edges are locked together.

Venus Fly Trap Leaf

Here is a leaf of the Venus's fly trap which is a spring trap for flies and other insects. The two parts…

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.

This is the bud of a Horse-Chestnut. This will open and the leaves will push out.

Horse-Chestnut Bud

This is the bud of a Horse-Chestnut. This will open and the leaves will push out.

The leaf of the Mountain Holly, Ilex monticola, (Keeler, 1915).

Mountain Holly Leaf

The leaf of the Mountain Holly, Ilex monticola, (Keeler, 1915).

Fairy with wand standing on a leaf.

Fairy with wand

Fairy with wand standing on a leaf.

Fairy with duster standing on a leaf.

Fairy with duster

Fairy with duster standing on a leaf.

Fairy sitting on a leaf.

Fairy sitting

Fairy sitting on a leaf.

Fairy dancing on a leaf.

Fairy dancing

Fairy dancing on a leaf.

Fairy scrubbing a leaf.

Fairy scrubbing

Fairy scrubbing a leaf.

Fairy sweeping on a leaf.

Fairy sweeping

Fairy sweeping on a leaf.

Fairy sewing on a leaf.

Fairy sewing

Fairy sewing on a leaf.

This shows the leaf of the Almondleaf Willow, Salix amygdaloides, (Keeler, 1915).

Almondleaf Willow Leaf

This shows the leaf of the Almondleaf Willow, Salix amygdaloides, (Keeler, 1915).

This shows the leaf of the Longleaf Willow, Salix fluviatilis, (Keeler, 1915).

Longleaf Willow Leaf

This shows the leaf of the Longleaf Willow, Salix fluviatilis, (Keeler, 1915).

This shows the staminate aments of the cottonwood, Populus deltoides (Keeler, 1915).

Cottonwood Flowers

This shows the staminate aments of the cottonwood, Populus deltoides (Keeler, 1915).

This shows the leaf of the Swamp Cottonwood, Populus heterophylla, (Keeler, 1915).

Swamp Cottonwood Leaf

This shows the leaf of the Swamp Cottonwood, Populus heterophylla, (Keeler, 1915).

This shows a typical leaf.

Leaves

This shows a typical leaf.

This shows an inflexed leaf.

Inflexed Leaf

This shows an inflexed leaf.

This shows a conduplicate leaf.

Conduplicate Leaf

This shows a conduplicate leaf.

This shows a plicate leaf.

Plicate Leaf

This shows a plicate leaf.

This shows a convolute leaf.

Convolute Leaf

This shows a convolute leaf.

This shows an involute leaf.

Involute Leaf Shape

This shows an involute leaf.

This shows an revolute leaf.

Revolute Leaf Shape

This shows an revolute leaf.

This shows a needle-shaped leaf.

Needle-Shaped Leaf

This shows a needle-shaped leaf.

This shows a linear leaf.

Linear Leaf Shape

This shows a linear leaf.

This shows an lanceolate leaf.

Lanceolate Leaf Shape

This shows an lanceolate leaf.

This shows an oblanceolate leaf.

Oblanceolate Leaf Shape

This shows an oblanceolate leaf.

This shows an ovate leaf.

Ovate Leaf Shape

This shows an ovate leaf.

This shows an obovate leaf.

Leaf

This shows an obovate leaf.