42 illustrations of maple trees including: Japanese maple, mountain maple, Norway maple, red maple, silver maple, and sugar maple, as well as detailed illustrations of maple seeds, seedlings, and leaves

"A maple-tree, prob. so called from its pointed leaves. ex. Sugar maple"-Whitney, 1902

Acer

"A maple-tree, prob. so called from its pointed leaves. ex. Sugar maple"-Whitney, 1902

"A maple-tree, prob. so called from its pointed leaves. ex. Sugar maple"-Whitney, 1902

Acer

"A maple-tree, prob. so called from its pointed leaves. ex. Sugar maple"-Whitney, 1902

A class of trees belonging to the genus acer, containing about eighty species, all of which are confined to the north temperate zone.

Maple

A class of trees belonging to the genus acer, containing about eighty species, all of which are confined…

"Accessory buds of box-elder (Negundo). A, front view of group; B, two groups seen in profile." -Bergen, 1896

Maple Buds

"Accessory buds of box-elder (Negundo). A, front view of group; B, two groups seen in profile." -Bergen,…

Lower end of Maple root magnified, the root seen just as root-hairs are beginning to for a little behind the tip.

End of Maple Root

Lower end of Maple root magnified, the root seen just as root-hairs are beginning to for a little behind…

Maple seeds.

Maple Seed

Maple seeds.

A Red Maple seedling with next joint of stem and leaves apparent.

Maple Seedling

A Red Maple seedling with next joint of stem and leaves apparent.

A Red Maple seedling with parts full-grown and bud at apex for further growth.

Maple Seedling

A Red Maple seedling with parts full-grown and bud at apex for further growth.

Seedling Maple, of the natural size; the root well supplied with root hairs, here large enough to be seen by the naked eye.

Maple Seedling

Seedling Maple, of the natural size; the root well supplied with root hairs, here large enough to be…

Here is a representation of two seeds of the maple, with their wings. They always grow in this way, in pairs.

Maple Seeds

Here is a representation of two seeds of the maple, with their wings. They always grow in this way,…

An illustration of the cotyledon of a maple. A cotyledon is a significant part of the embryo within the seed of a plant. Upon germination, the cotyledon may become the embryonic first leaves of a seedling.

Cotyledon of a Maple

An illustration of the cotyledon of a maple. A cotyledon is a significant part of the embryo within…

The leaf of a Japanese Maple tree.

Japanese Maple

The leaf of a Japanese Maple tree.

The leaf of a Norway Maple tree.

Norway Maple

The leaf of a Norway 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 Silver Maple tree.

Silver Maple

The leaf of a Silver Maple tree.

They are among the most prized of trees for park and street planting, and nearly all of them become finely colored in autumn.

Sugar Maple

They are among the most prized of trees for park and street planting, and nearly all of them become…

The leaf of a Sugar Maple tree.

Sugar Maple

The leaf of a Sugar Maple tree.

The leaf of a Sycamore Maple tree.

Sycamore Maple

The leaf of a Sycamore Maple tree.

"1. Acer circinatum. 2. flower of A. campestre; 3. its samara; 4. the same, with the seed laid bare; 5. the embryo unfolded." -Lindley, 1853

Vine Maple

"1. Acer circinatum. 2. flower of A. campestre; 3. its samara; 4. the same, with the seed laid bare;…

The seeds of the Mountain Maple, Acer spicatum, (Keeler, 1915).

Mountain Maple Seed

The seeds of the Mountain Maple, Acer spicatum, (Keeler, 1915).

One of the pair of keys or winged fruits of Red Maple; the seed-bearing portion cut open to show the seed.

Red Maple

One of the pair of keys or winged fruits of Red Maple; the seed-bearing portion cut open to show the…

This shows the axillary buds on a twig of Red Maple, they are opposite like the leaves.

Red Maple Buds

This shows the axillary buds on a twig of Red Maple, they are opposite like the leaves.

Embryo taken out and partly opened.

Red Maple Embryo

Embryo taken out and partly opened.

Seed enlarged, and divided to show the crumpled embryo which fills it.

Red Maple Seed

Seed enlarged, and divided to show the crumpled embryo which fills it.

Leaves - simple; opposite; edge lobed, with the lobes irregularly sharp-toothed and notched. Outline - roundish, with three to five lobes (the lowest pair, if present, the smallest); and with the hollows between the lobes pointed and usually extending less than half-way to the base of the leaf. Apex - of the lobes, pointed. Base - heart-shaped (or sometimes rounded.) Leaf/Stem - long and round. Leaf - (very variable in size and in the toothing and shape of its lobes); whitish beneath. Bark - smoothish; gray, becoming dark and rough with age. Flowers - rich crimson, on short stems in drooping clusters. March, April. Fruit - bright red, smooth, with stems two to three inches long. The wings are about one inch long. At first they approach each other, but afterward are somewhat spreading. September.Found - widely distributed in swamps and along streams especially in all wet forests eastward from the Mississippi to the Atlantic, and from Southern Canada to Florida and Texas. General Information - A tree thirty to sixty feet high, with wood of considerable value, especially when it shows a "curly grain." It is one of the very earliest trees to blossom in the spring, and to show its autumn coloring in the fall.

Genus Acer, L. (Maple)

Leaves - simple; opposite; edge lobed, with the lobes irregularly sharp-toothed and notched. Outline…

Red-Maple branch, with accessory buds placed side by side. The annular lines toward the base are scars of the bud-scales, and indicate the place of the winter-bud of the preceding year.

Red-Maple branch

Red-Maple branch, with accessory buds placed side by side. The annular lines toward the base are scars…

A Silver Maple embryo, taken out of the husk; upper part of growing stem cut off.

Silver Maple Embryo

A Silver Maple embryo, taken out of the husk; upper part of growing stem cut off.

The staminate flowers of the Silver Maple, Acer saccharinum, (Keeler, 1915).

Silver Maple Flower

The staminate flowers of the Silver Maple, Acer saccharinum, (Keeler, 1915).

The pistillate flowers of the Silver Maple, Acer saccharinum, (Keeler, 1915).

Silver Maple Flower

The pistillate flowers of the Silver Maple, Acer saccharinum, (Keeler, 1915).

Fruit of Silver Maple, Acer dasycarpum, of natural size, the seed-bearing portion divided to show seed.

Silver Maple Key

Fruit of Silver Maple, Acer dasycarpum, of natural size, the seed-bearing portion divided to show seed.

The seeds of the Silver Maple, Acer saccharinum, (Keeler, 1915).

Silver Maple Seed

The seeds of the Silver Maple, Acer saccharinum, (Keeler, 1915).

Embryo of the seed taken out.

Silver Maple seed

Embryo of the seed taken out.

Silver Maple seed open out, to show the thick cotyledons and the little plumule or bud between them.

Silver Maple Seed Open

Silver Maple seed open out, to show the thick cotyledons and the little plumule or bud between them.

Leaves - simple; opposite; edge deeply lobed, with the lobes unequally notched and toothed. Outline - rounded, with five lobes (the lowest pair much the smallest), and with the hollows between the lobes pointed and usually extending half way to the base of the leaf. Apex - of lobes, pointed. Base - heart-shaped or nearly squared. Leaf - silvery white beneath; downy when young, becoming smooth. Flowers - yellowish-green; woolly when young, becoming nearly smooth; on stems about one inch long, with very large, wide-spreading wings (two to three inches long), one of which is often undeveloped. July, August. Found - widely distributed, but most common west of the Alleghany Mountains and southward. General Information - A tree thirty to fifty feet high, with soft, white wood of comparatively slight value.

Genus Acer, L. (Maple)

Leaves - simple; opposite; edge deeply lobed, with the lobes unequally notched and toothed. Outline…

Silver tree is the common name of leucadendron argenteum. The branches are densely leafy. It is native to South Africa.

Silver Tree

Silver tree is the common name of leucadendron argenteum. The branches are densely leafy. It is native…

"The maple spot gall, so common on the leaves of the red maple, is made by the fungus-gnat of the order Diptera." — Davison, 1906

Maple spot gall

"The maple spot gall, so common on the leaves of the red maple, is made by the fungus-gnat of the order…

Pair of samaras of Sugar Maple.

Sugar Maple

Pair of samaras of Sugar Maple.

Embryo of Sugar Maple,(Gray, 1858).

Sugar Maple Embryo

Embryo of Sugar Maple,(Gray, 1858).

Whole embryo of Sugar Maple just beginning to grow.

Sugar Maple Embryo

Whole embryo of Sugar Maple just beginning to grow.

The seeds of the Sugar Maple, Acer saccharum, (Keeler, 1915).

Sugar Maple seed

The seeds of the Sugar Maple, Acer saccharum, (Keeler, 1915).

Leaves - simple; opposite; edge lobed, with the lobes very sparingly and coarsely sharp-toothed or the lower pair entire. Outline - rounded, with three to five lobes, usually five, with the hollows between the lobes and between the coarse teeth rounded. Apex - of the lobes, pointed. Base - heart-shaped or nearly squared. Leaf - dark green above; slightly lighter beneath; smooth or somewhat downy on the ribs; closely resembling that of the introduced "Norway Maple" by lacking the latter's milky-juiced leaf-stem. Bark - light gray, usually smoothish when young, becoming rough and scaly. Flowers - yellow-green and very abundant. April, May.  Fruit - greenish-yellow, smooth, drooping, on thread-like and hairy stems one to two inches long, with wings about one inch long, broad and slightly spreading. September. Found - from Southern Canada through the Northern States, southward along the Alleghany Mountains, and westward to Minnesota, Eastern Nebraska, and Eastern Texas. Its finest development is in the region of the Great Lakes. It grows in rich woods; often it forms "groves," sometimes extensive forests.

Genus Acer, L. (Maple)

Leaves - simple; opposite; edge lobed, with the lobes very sparingly and coarsely sharp-toothed or the…

"Winged fruits. I, elm; II, maple." -Bergen, 1896

Winged Fruits

"Winged fruits. I, elm; II, maple." -Bergen, 1896