ClipArt ETC
A gingko leaf.

Gingko Leaf

A gingko leaf.

A horse-chestnut leaf.

Horse-Chestnut Leaf

A horse-chestnut leaf.

A buckeye leaf.

Buckeye Leaf

A buckeye leaf.

A hickory leaf.

Hickory Leaf

A hickory leaf.

A butternut leaf.

Butternut Leaf

A butternut leaf.

A black birch leaf.

Black Birch Leaf

A black birch leaf.

An American beech leaf.

American Beech Leaf

An American beech leaf.

A black walnut leaf.

Black Walnut Leaf

A black walnut leaf.

A yellow locust leaf.

Yellow Locust Leaf

A yellow locust leaf.

A leaf from the white or gray birch.

White or Gray Birch Leaf

A leaf from the white or gray birch.

A catalpa leaf.

Catalpa Leaf

A catalpa leaf.

A honey locust leaf.

Honey Locust Leaf

A honey locust leaf.

A leaf from a sycamore tree.

Sycamore Leaf

A leaf from a sycamore tree.

A leaf from a gumwood tree.

Gumwood Leaf

A leaf from a gumwood tree.

A leaf from a whitewood or tulip tree.

Whitewood Leaf

A leaf from a whitewood or tulip tree.

A leaf from an American elm tree.

American Elm Leaf

A leaf from an American elm tree.

The leaf of a chestnut tree.

Chestnut Leaf

The leaf of a chestnut tree.

The leaf of a chestnut-oak tree.

Chestnut-Oak Leaf

The leaf of a chestnut-oak tree.

The leaf of a white oak tree.

White Oak Leaf

The leaf of a white oak tree.

The leaf of a red oak tree.

Red Oak Leaf

The leaf of a red oak tree.

The leaf of a post-oak tree.

Post-Oak Leaf

The leaf of a post-oak tree.

The leaf of a live-oak tree.

Live-Oak Leaf

The leaf of a live-oak tree.

The leaf of a mossy-cup oak tree.

Mossy-Cup Oak Leaf

The leaf of a mossy-cup oak tree.

The leaf of a white oak tree.

White Oak Leaf

The leaf of a white oak tree.

The leaf of a scarlet oak tree.

Scarlet Oak Leaf

The leaf of a scarlet oak tree.

The leaf of a pin-oak tree.

Pin-Oak Leaf

The leaf of a pin-oak tree.

The leaf of a English oak tree.

English Oak Leaf

The leaf of a English oak tree.

The leaf of a Black-jack oak tree.

Black-Jack Oak Leaf

The leaf of a Black-jack oak tree.

The leaf of a Black oak tree.

Black Oak Leaf

The leaf of a Black oak tree.

The leaf of a laurel-oak tree.

Laurel-Oak Leaf

The leaf of a laurel-oak tree.

The leaf of a willow-oak tree.

Willow-Oak Leaf

The leaf of a willow-oak tree.

The leaf of a Norway Maple tree.

Norway Maple

The leaf of a Norway Maple tree.

The leaf of a Japanese Maple tree.

Japanese Maple

The leaf of a Japanese Maple tree.

The leaf of a Silver Maple tree.

Silver Maple

The leaf of a Silver Maple tree.

The leaf of a Red or Swamp Maple tree.

Red or Swamp Maple

The leaf of a Red or Swamp Maple tree.

The leaf of a Sycamore Maple tree.

Sycamore Maple

The leaf of a Sycamore Maple tree.

The leaf of a Sugar Maple tree.

Sugar Maple

The leaf of a Sugar Maple tree.

"Bruin thought he was in clover..." -University Society, 1920

Bears 9

"Bruin thought he was in clover..." -University Society, 1920

"The 'leaf bug' (Dicyphus minimus): a, newly hatched; b, second stage; c, nymph; d, adult; e, head and beak from side--enlarged (original)." -Department of Agriculture, 1899

Leaf Bug

"The 'leaf bug' (Dicyphus minimus): a, newly hatched; b, second stage; c, nymph; d, adult; e, head and…

A leaf damaged by the tobacco split worm.

Split Worm Damage

A leaf damaged by the tobacco split worm.

The larva and pupa stages of the cabbage plusia.

Cabbage Plusia Larva and Pupa

The larva and pupa stages of the cabbage plusia.

The larva of the bean leaf-beetle, Cerotoma trifurcata.

Bean Leaf-Beetle Larva

The larva of the bean leaf-beetle, Cerotoma trifurcata.

The adult of the bean leaf-beetle, Cerotoma trifurcata.

Bean Leaf-Beetle

The adult of the bean leaf-beetle, Cerotoma trifurcata.

The pupa of the bean leaf-beetle, Cerotoma trifurcata.

Bean Leaf-Beetle Pupa

The pupa of the bean leaf-beetle, Cerotoma trifurcata.

The leaves of the common rose geranium, Pelargonium capitatum.

Rose Germanium

The leaves of the common rose geranium, Pelargonium capitatum.

The leaves of the skeleton-leaved geranium, Pelargonium radula.

Skeleton-Leaved Germanium

The leaves of the skeleton-leaved geranium, Pelargonium radula.

The epidermis of an oak leaf.

Plant Epidermis

The epidermis of an oak leaf.

The epidermis of an iris leaf.

Plant Epidermis

The epidermis of an iris leaf.

"Cross section of a portion of leaf of Ficus elastica showing the multiple epidermis from e to a inclusive; c, cystolith; b, palisade parenchyma; d, spongy parenchyma." -Stevens, 1916

F. Elastica Epidermis

"Cross section of a portion of leaf of Ficus elastica showing the multiple epidermis from e to a inclusive;…

"A, cross section through upper half of leaf of Pyrus Japonica, showing cutinized layer of the outer wall at f, and cellulose layer at g." -Stevens, 1916

P. Japonica Epidermis

"A, cross section through upper half of leaf of Pyrus Japonica, showing cutinized layer of the outer…

A cross section through the upper half of a Russian olive leaf, showing a "cutinized layer of the outer wall at f, and cellulose layer at g." -Stevens, 1916

Russian Olive Leaf Epidermis

A cross section through the upper half of a Russian olive leaf, showing a "cutinized layer of the outer…

"A, portion of cross section of leaf of Avicennia growing in salty soil; outer wall of epidermis very thick." -Stevens, 1916

Avicennia Epidermis

"A, portion of cross section of leaf of Avicennia growing in salty soil; outer wall of epidermis very…

"D, upper, and E, lower epidermis of leaf of Hibiscus moscheutos." -Stevens, 1916

H. Moscheutos Epidermis

"D, upper, and E, lower epidermis of leaf of Hibiscus moscheutos." -Stevens, 1916

"Multiple epidermis of leaf of mangrove in cross section. This serves as a water reservoir, and the relatively thick walls of the inner cells reenforce the protective power of the outer layer." -Stevens, 1916

Multiple Epidermis

"Multiple epidermis of leaf of mangrove in cross section. This serves as a water reservoir, and the…

"Stone cells from different sources. 1, from coffee; 2, 3, and 4, from stem of clove; 5 and 6, from tea leaf; 7, 8, and 9, from powdered star anise seed." -Stevens, 1916

Stone Cells

"Stone cells from different sources. 1, from coffee; 2, 3, and 4, from stem of clove; 5 and 6, from…

"Diagram showing the relation of the water-carrying tissues of the leaves to those of the stem, and how the older rings of growth give up their water to the newer before this water can enter the leaves. The figures at the bottom indicate in years the age of the rings." -Stevens, 1916

Water Flow in Plants

"Diagram showing the relation of the water-carrying tissues of the leaves to those of the stem, and…

A: "Camera-lucida drawing of a bleached leaf of a Dicotyledon, showing the course of the vascular bundles, and how end free in the mesophyll." C:magnified detail. -Stevens, 1916

Dicotyledon Leaf

A: "Camera-lucida drawing of a bleached leaf of a Dicotyledon, showing the course of the vascular bundles,…

B: "Camera-lucida drawing of a bleached leaf of... a Monocotyledon, showing the anastomosis of the parallel veins by means of slender lateral branches." D: magnified detail. -Stevens, 1916

Monocotyledon Leaf

B: "Camera-lucida drawing of a bleached leaf of... a Monocotyledon, showing the anastomosis of the parallel…

"Semi-diagrammatic cross section of a leaf showing by arrows how the water passes from the tracheal elements of a vein into the border parenchyma cells, and thence into the palisade and spongy parenchyma, from which it evaporates into the intercellular spaces and passes from the leaf through the stomata. a, upper epidermis; b, lower epidermis; c, palisade parenchyma; g, spongy parenchyma; d, border parenchyma; e, tracheal elements; and the stippled cells bellow e, the phloem cells." -Stevens, 1916

Leaf Water Flow

"Semi-diagrammatic cross section of a leaf showing by arrows how the water passes from the tracheal…

"Diagram to show the path of the water as it rises to, and escapes from, the leaves." -Stevens, 1916

Leaf Water Flow

"Diagram to show the path of the water as it rises to, and escapes from, the leaves." -Stevens, 1916