219 illustrations of trees including: date palm, deutzia, dogwood, douglas fir, dragon tree, eastern black oak, eastern cottonwood, ebony, elderberry, elm, English oak, eucalyptus, ficus, fig, fir, foxtail pine, fraser fir, geiger tree, ginkgo, grapefruit, gum arabic, hemlock, hickory, honey locust, and horse chestnut

The branch of a Hicoria villosa tree, a species of hickory.

Branch of Hicoria Villosa

The branch of a Hicoria villosa tree, a species of hickory.

Trees of Hispaniola during Columbus' exploration. Trees such as "Mamei, Guaiana, Guanauana, and Platano."

Hispaniola Trees

Trees of Hispaniola during Columbus' exploration. Trees such as "Mamei, Guaiana, Guanauana, and Platano."

Also known as Yucca schottii. A branch from the Hoary Yucca, a species of plant from the agave family.

Branch of Hoary Yucca

Also known as Yucca schottii. A branch from the Hoary Yucca, a species of plant from the agave family.

The leaves and fruit of the American Holly.

Holly

The leaves and fruit of the American Holly.

A branching thorn of Honey Locust, being an indurate leafless branch developed from an accessory bud far above the axial: at the cut portion below, three other buds are concealed under the petiole.

Honey Locust

A branching thorn of Honey Locust, being an indurate leafless branch developed from an accessory bud…

"Branch and Pod of Honey-locust (Gleditschia triacanthos). GLEDITSCHIA. A genus of leguminous thorny trees, with abruptly once or twice pinnate leaves, inconspicuous greenish and polygamous flowers, and flat pods." -Whitney, 1911

Honey Locust

"Branch and Pod of Honey-locust (Gleditschia triacanthos). GLEDITSCHIA. A genus of leguminous thorny…

A honey locust leaf.

Honey Locust Leaf

A honey locust leaf.

Leaves - compound; )even-feathered, leaflets, ten to twenty-two or more, usually about fourteen), sometimes twice compound; alternate; edge of leaflets entire as seen above, but as seen below often remotely and slightly toothed. Outline of leaflet - long oval or long egg-shape. Base - and narrowed. Apex - rounded. Leaf/Stem - and very short. Leaflet/Stem - downy. Leaflets - three fourths to one and a half inches long; about one third as wide. Often several of them (one to three) are partly or wholly divided into smaller leaflets. Surfaces smooth and shining. Bark - of trunk, gray, and much less rough than that of the common Locust (which has a somewhat similar leaf); branchlets brown and often warty. The branches and the trunk, excepting in very young and quite old trees, are usually thickly covered with spines, two to four inches long, which are curved at the base, often two- to three-branches, and of a reddish-brown color. Flowers - small and greenish. Fruit - a long, flat pod (nine to eighteen inches long) reddish; somewhat twisted, and filled between the seeds with a pulp which at first is sweet (whence the name "Honey" Locust) but which soon becomes sour. The seeds are flat, hard, and brown. Found - native in Pennsylvania, westward and southward, but also somewhat naturalized and widely introduced northward.  General Information - A tree sometimes seventy feet high, with wide-spreading and graceful branches, and light and delicate foliage. It is often used as a hedge plant. A variety entirely bare of thorns (var. inermis) is sometimes found; also a variety (var. brachycarpos) with shorter fruit and thorns.

Genus Gleditschia, L. (Honey Locust)

Leaves - compound; )even-feathered, leaflets, ten to twenty-two or more, usually about fourteen), sometimes…

A twice-primate leaf of the Honey-Locust.

Honey-Locust

A twice-primate leaf of the Honey-Locust.

Also known as Quisqualis indica. A vine with red flower clusters that can grow between 2.5 meters and 8 meters. It is commonly found in Asia.

Chinese Honeysuckle

Also known as Quisqualis indica. A vine with red flower clusters that can grow between 2.5 meters and…

Also known as Salix hookeriana. The branch of a Hooker's Willow tree, native to the west coast of North America.

Branch of Hooker's Willow

Also known as Salix hookeriana. The branch of a Hooker's Willow tree, native to the west coast of North…

This shows the pistillate and staminate aments of Hop Hornbeam, Ostrya virginiana, (Keeler, 1915).

Hop Hornbeam Flowers

This shows the pistillate and staminate aments of Hop Hornbeam, Ostrya virginiana, (Keeler, 1915).

This is a small tree with wide crown, native to North America.

Hop Tree

This is a small tree with wide crown, native to North America.

Leaves - simple; alternate; edge very sharply and slightly irregularly and unequally toothed. Outline - long oval or long egg-shape. Apex - taper-pointed. Base - slightly heart-shaped. Leaf/Stem - about one fourth inch long, and often rough. Leaf - usually three to four inches long, and about half as wide, but with many smaller leaves of varying size on the same branch; smoothish above, paler and somewhat downy below. Ribs - The straight ribs and their angles hairy. Bark - of trunk, brownish or dark gray, and remarkable for being finely furrowed up and down, with the ridges broken into three - to four-inch lengths. These divisions are narrower than on any other rough-barked tree, and they become narrower and finer as the tree grows older. The new shoots are reddish green and dotted with brown; the younger branches purplish-brown and dotted with white or gray. When the branch is two to three inches thick, its bark becomes grayish and begins to crack. Fruit - in long oval, drooping clusters, resembling those of the hop-vine, with long, unlobed scales that lap each other like shingles. August, September. Found - oftenest on dry hill-sides. Common North, South, and West, especially in Southern Arkansas. General Information - A tree twenty to thirty feet high, with white, very strong, and compact wood. It would be very valuable, if it were more abundant and of larger growth.

Genus ostrya, Scop. (Hop-Hornbeam)

Leaves - simple; alternate; edge very sharply and slightly irregularly and unequally toothed. Outline…

An illustration of the hornbeam branch.

Hornbeam Branch

An illustration of the hornbeam branch.

This shows the pistillate and staminate aments of Hornbeam, Carpinus caroliniana, (Keeler, 1915).

Hornbeam Flowers

This shows the pistillate and staminate aments of Hornbeam, Carpinus caroliniana, (Keeler, 1915).

Leaves - simple; alternate; edge very sharply and quite irregularly and unevenly toothed. Outline - long egg-shape, or reverse long egg-shape. Apex - taper-pointed. Base - rounded or slightly heart-shaped. Leaf/Stem - about one half inch long, slender and smooth, or slightly hairy. Leaf - usually three to four inches long, and about half as wide, but with many smaller leaves of varying size on the same branch; nearly smooth, slightly hairy on the straight and distinct ribs and in their angles. Bark - of trunk, a deep bluish-gray or slate; smooth, but often marked up and down with irregular ridges, which run from each side of the lower branches. The new shoots are somewhat hairy, and brownish or purple; the older branchlets, an ashy-gray color, with a pearly luster. Fruit - in loose drooping cluster, with leaf-like scales that are strongly three-lobed and placed in pairs base to base. October. Found - along streams and in swamps. Quite common North, South, and West; northward often only as a low shrub. General Information - A small tree or shrub, usually ten to twenty feet high, but in the southern Alleghany Mountains sometimes reaching a height of fifty feet. Its wood is white and very compact and strong.

Genus Carpinus, L. (Hornbeam)

Leaves - simple; alternate; edge very sharply and quite irregularly and unevenly toothed. Outline -…

Half of a horse-chestnut, similarly cut; the caulicle is curved down on the side of one of the thick cotyledons.

Horse Chestnut

Half of a horse-chestnut, similarly cut; the caulicle is curved down on the side of one of the thick…

Horse-chestnut in germination; footstalks are formed to the cotyledons, pushing out in their lengthening the growing parts.

Horse Chestnut in Germination

Horse-chestnut in germination; footstalks are formed to the cotyledons, pushing out in their lengthening…

An illustration of a horse chestnut shot.

Horse Chestnut Shoot

An illustration of a horse chestnut shot.

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.

"Horse-chestnut (Aesculus Hippocastanum). ls, leaf-scar, showing scars of seven fibro-vascular bundles, corresponding, in number, to the seven leaflets of the compound leaf, formerly attached at ls. The leaf is drawn to a smaller scale than the branch." -Gager, 1916

Horse-Chestnut Leaf

"Horse-chestnut (Aesculus Hippocastanum). ls, leaf-scar, showing scars of seven fibro-vascular bundles,…

A horse-chestnut leaf.

Horse-Chestnut Leaf

A horse-chestnut leaf.

"Moringa pterygosperma; 2. its fruit; 3, the section of a flower of M. aptera; 4. its anther; 5. a section of its seed." -Lindley, 1853

Horseradish Tree

"Moringa pterygosperma; 2. its fruit; 3, the section of a flower of M. aptera; 4. its anther; 5. a section…

Horseradish tree was named because of the pungent taste of the root. The root is sometimes eaten. The young fruit is also edible.

Horseradish Tree

Horseradish tree was named because of the pungent taste of the root. The root is sometimes eaten. The…

Horseradish tree is the common name of <i>moringa oleifera</i>. It is a small tree with soft wood and corky bark. The flowers are whitish and fragrant. It is named for the pungent taste of the root.

Horseradish Tree

Horseradish tree is the common name of moringa oleifera. It is a small tree with soft wood and corky…

Cone of horsetail.

Cone of horsetail

Cone of horsetail.

Submerged leaves gathered along a few centimeters of the stem; flower stalks inflated.

Hottonia

Submerged leaves gathered along a few centimeters of the stem; flower stalks inflated.

Ilex aquifolium ferox is a green leaved variety of holly. The common name is hedgehog holly. The leaves are two inches long with strongly developed marginal spines.

Leaf of Ilex Aquifolium Ferox

Ilex aquifolium ferox is a green leaved variety of holly. The common name is hedgehog holly. The leaves…

Common holly is the common name of ilex aquifolium. The leaves are shiny and spiny toothed.

Ilex Aquifolium

Common holly is the common name of ilex aquifolium. The leaves are shiny and spiny toothed.

Ilex aquifolium argentea medio-picta is a green leaved variety of holly. The leaves are dark green at the edge with a large, central blotch of creamy white. The leave have strong spines.

Leaf of Ilex Aquifolium Argentea Medio-Picta

Ilex aquifolium argentea medio-picta is a green leaved variety of holly. The leaves are dark green at…

Ilex aquifolium bessonia is a green leaved variety of holly. The leaves are lighter green than most varieties. The leaves are spineless and less rigid.

Leaf of Ilex Aquifolium Bessonia

Ilex aquifolium bessonia is a green leaved variety of holly. The leaves are lighter green than most…

Ilex aquifolium crassifolia is a green leaved variety of holly. The leaves are dull green. The leaves are very thick with recurved tips and margins. The leaves have prominent, saw like teeth.

Leaf of Ilex Aquifolium Crassifolia

Ilex aquifolium crassifolia is a green leaved variety of holly. The leaves are dull green. The leaves…

Ilex aquifolim doningtonensis is a green leaved variety of holly. The margins of the leaves have few or no spines. The leaves are two inches long and three quarters inches broad.

Leaf of Ilex Aquifolium Doningtonensis

Ilex aquifolim doningtonensis is a green leaved variety of holly. The margins of the leaves have few…

Ilex aquifolium hendersoni is a green leaved variety of holly. The leaves are dark green with sunken veins.

Leaf of Ilex Aquifolium Hendersoni

Ilex aquifolium hendersoni is a green leaved variety of holly. The leaves are dark green with sunken…

Ilex aquifolium ovata is a green leaved variety of holly. The leaves are about two and a half inches long. The leaves have scarce, spiny teeth.

Leaf of Ilex Aquifolium Ovata

Ilex aquifolium ovata is a green leaved variety of holly. The leaves are about two and a half inches…

Ilex aquifolium pyramidalis is a green leaved variety of holly. The leaves are dark green. The leaves have six or eight spines on the same plane as the leaf.

Leaf of Ilex Aquifolium Pyramidalis

Ilex aquifolium pyramidalis is a green leaved variety of holly. The leaves are dark green. The leaves…

Ilex aquifolim tortuosa is a green leaved variety of holly. The leaves are about two inches long and one inch broad. The blade is sprially twisted once.

Leaf of Ilex Aquifolium Tortuosa

Ilex aquifolim tortuosa is a green leaved variety of holly. The leaves are about two inches long and…

Ilex dipyrena is a variety of holly. The leaves are oblong and growi on short stalks. The leaves are spiny and serrated.

Leaf of Ilex Dipyrena

Ilex dipyrena is a variety of holly. The leaves are oblong and growi on short stalks. The leaves are…