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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).

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…

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,…

"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…

Upper part of a stem of a Horsetail, Equisetum sylvaticum.

Horsetail

Upper part of a stem of a Horsetail, Equisetum sylvaticum.

Cone of horsetail.

Cone of horsetail

Cone of horsetail.

"Equisetum sylvaticum: a, a, sheath crowned with teeth; b, branches; c, c, fruiting spikes. 2. Clypeola, bearing sporangia. 3. Spore, with elaters coiled about it." -Whitney, 1911

Wood Horsetail

"Equisetum sylvaticum: a, a, sheath crowned with teeth; b, branches; c, c, fruiting spikes. 2. Clypeola,…

The houseleek is a fleshy plant, or succulent, which stores its nourishment in its leaves.

Houseleek

The houseleek is a fleshy plant, or succulent, which stores its nourishment in its leaves.

House leek (Sempervivum), with offsets.

Houseleek

House leek (Sempervivum), with offsets.

A young plant of the Houseleek, with the leaves (not yet expanded) numbered, and exhibiting the 13-ranked arrangement; and sowing secondary spirals.

Houseleek

A young plant of the Houseleek, with the leaves (not yet expanded) numbered, and exhibiting the 13-ranked…

The Huito (Genipa americana) is a small tree with edible fruit in the madder family, Rubiaceae.

Huito

The Huito (Genipa americana) is a small tree with edible fruit in the madder family, Rubiaceae.

"Eichhornia speciosa; 1. pistil; 2. transverse section of the ovary." -Lindley, 1853

Water Hyacinth

"Eichhornia speciosa; 1. pistil; 2. transverse section of the ovary." -Lindley, 1853

The Hydnora africana is a parasitic plant growing in deserts known for giving of the odor of feces to attract pollinators like dung beetles.

Hydnora africana

The Hydnora africana is a parasitic plant growing in deserts known for giving of the odor of feces to…

The longitudinal section of the Hydnora africana is a parasitic plant growing in deserts known for giving of the odor of feces to attract pollinators like dung beetles.

Hydnora africana

The longitudinal section of the Hydnora africana is a parasitic plant growing in deserts known for giving…

A hydrangea used for an experiment.

Hydrangea

A hydrangea used for an experiment.

"1. Hydrangeaa virens and its flower. 2. seed-vessel of H. hortensis; 3. its seed; 4. a section of it." -Lindley, 1853

Hydrangea

"1. Hydrangeaa virens and its flower. 2. seed-vessel of H. hortensis; 3. its seed; 4. a section of it."…

Compound cyme of Hydrangea arborescens, with neutral enlarged flowers round the circumference.

Hydrangea arborscens

Compound cyme of Hydrangea arborescens, with neutral enlarged flowers round the circumference.

"Hypericum floribundum; 1. an entire flower; 2. a bundle of stamens; 3. a pistil with 3 carpels; 4. a seed laid horizontally and cut through, to show the embryo and netted testa; 5. a piece of a leaf with transparent dots." -Lindley, 1853

Hypericum

"Hypericum floribundum; 1. an entire flower; 2. a bundle of stamens; 3. a pistil with 3 carpels; 4.…

Cross-section of an ovary of Hypericum graveolens, the three large placenta meeting in the centre, so as to form a three-celled ovary.

Hypericum graveolens

Cross-section of an ovary of Hypericum graveolens, the three large placenta meeting in the centre, so…

"Hypocyrta gracilis. 1. section of a flower; 2. cross section of a fruit; 3. seed with it embryo exposed to view." -Lindley, 1853

Hypocyrta

"Hypocyrta gracilis. 1. section of a flower; 2. cross section of a fruit; 3. seed with it embryo exposed…

A type of stamen that is positioned underneath the pistil in a flower.

Hypogynous Stamens

A type of stamen that is positioned underneath the pistil in a flower.

"Cetraria islandica: a a. its shields; b. a shield magnified and divided vertically." -Lindley, 1853

Iceland Moss

"Cetraria islandica: a a. its shields; b. a shield magnified and divided vertically." -Lindley, 1853

"Mesembryanthemum. 1. its fruit; 2. the same opened; 3. a seed; 4. the same divided perpendicularly." -Lindley, 1853

Icicle Plant

"Mesembryanthemum. 1. its fruit; 2. the same opened; 3. a seed; 4. the same divided perpendicularly."…

Some cells of the albumen or floury part of Indian Corn, filled with starch-grains.

Indian Corn

Some cells of the albumen or floury part of Indian Corn, filled with starch-grains.

Spadix and spathe of the Indian Turnip; the latter cut through below.

Indian Turnip

Spadix and spathe of the Indian Turnip; the latter cut through below.

A term used in botany referring to a case when a collection of hairs unite to form a cup inclosing the stigma of a flower; the scale or shield covering the fruit-spot of the fern.

Indusium

A term used in botany referring to a case when a collection of hairs unite to form a cup inclosing the…

This shows an inflexed leaf.

Inflexed Leaf

This shows an inflexed leaf.

"Diagrams of inflorescence. A, panicle; B, raceme; C, spike; D, head; E, umbel." -Bergen, 1896

Inflorescence

"Diagrams of inflorescence. A, panicle; B, raceme; C, spike; D, head; E, umbel." -Bergen, 1896

This shows an involute leaf.

Involute Leaf Shape

This shows an involute leaf.

Ione bicolor, a species in the Orchid family.

Ione

Ione bicolor, a species in the Orchid family.

"Richardsonia scabra. 1. an ovary with its calyx; 2. a corolla; 3. a vertical section of a seed, with an erect embryo in copious albumen." -Lindley, 1853

Ipecacuanha

"Richardsonia scabra. 1. an ovary with its calyx; 2. a corolla; 3. a vertical section of a seed, with…

Flower of Ipomoea coccinea; limb almost <em>entire</em>.

Ipomoea Coccinea

Flower of Ipomoea coccinea; limb almost entire.

Rootstock and equitant leaves of Iris.

Iris

Rootstock and equitant leaves of Iris.

A section across the cluster of leaves at the bottom, showing the equitation.

Iris cluster

A section across the cluster of leaves at the bottom, showing the equitation.

A germinating seedling of the Iris, its plumule developed into the first four leaves (alternate), the first one rudimentary; the cotyledon remains in the seed.

Iris Germinating

A germinating seedling of the Iris, its plumule developed into the first four leaves (alternate), the…

Capsule of Iris, with loculicidal dehiscence; below, cut across.

Capsule of Iris

Capsule of Iris, with loculicidal dehiscence; below, cut across.

Iris germanica or German Iris and the ripe capsule of an Iris.

German Iris

Iris germanica or German Iris and the ripe capsule of an Iris.

Acacia estrophiolata, commonly known as the Ironwood or Southern Ironwood, is a tree native to Central Australia. It is a graceful, pendulous shade tree, which grows from about 4-16 m tall and has a trunk with a diameter of up to about 0.45 m. Young plants are spiky leafed. It has pale yellow flowers after winter rains. It is usually found in areas with about 220-350 mm/year of average rainfall.

Ironwood

Acacia estrophiolata, commonly known as the Ironwood or Southern Ironwood, is a tree native to Central…

Stamen of Isopyrum, with innate anther.

Isopyrum

Stamen of Isopyrum, with innate anther.

"1. Hedera Helix; 2. a flower of Dimorphanthus edulis; 3. perpendicular section of the ovary; 4. undivided ovary; 5. ripe fruit; 6. cross section of it; 7. section of seed of H. Helix." -Lindley, 1853

Ivy

"1. Hedera Helix; 2. a flower of Dimorphanthus edulis; 3. perpendicular section of the ovary; 4. undivided…

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.

"Jasminum ligustrifolium. 1. a corolla cut open; 2. vertical section of the ovary; 3. section of a seed of Nytanthes." -Lindley, 1853

Jasmine

"Jasminum ligustrifolium. 1. a corolla cut open; 2. vertical section of the ovary; 3. section of a seed…

The Yellow Jasmine (Gelsemium sempervirens) is a vine in the Gelsemiaceae family.

Yellow Jasmine

The Yellow Jasmine (Gelsemium sempervirens) is a vine in the Gelsemiaceae family.

This shows the cluster of two leaves, bright green, of the Jersey Pine, Pinus virginiana, (Keeler, 1915).

Jersey Pine Needles

This shows the cluster of two leaves, bright green, of the Jersey Pine, Pinus virginiana, (Keeler, 1915).

The jimson weed (Datura stramonium) of the Nightshade family known as a hallucinogen.

Jimson Weed

The jimson weed (Datura stramonium) of the Nightshade family known as a hallucinogen.

A bulbous plant with a fragrant flower.

Jonquils

A bulbous plant with a fragrant flower.

Juncus acutiflorus belongs to a genus of grass-like herbs (Juncus) that grow in boggy places.

Juncus Acutiflorus

Juncus acutiflorus belongs to a genus of grass-like herbs (Juncus) that grow in boggy places.

Juncus compressus belongs to a genus of grass-like herbs (Juncus) that grow in boggy places.

Juncus Compressus

Juncus compressus belongs to a genus of grass-like herbs (Juncus) that grow in boggy places.

Juncus conglomeratus, also known as the common rush, belongs to a genus of grass-like herbs (Juncus) that grow in boggy places. It is the best known species, with cylindrical stems and crowded panicles of flowers below the tapered extremities of the stems.

Juncus Conglomeratus

Juncus conglomeratus, also known as the common rush, belongs to a genus of grass-like herbs (Juncus)…

Known as the soft rush, Juncus effusus is nearly as common as the most common species, J. conglomeratus. It can be distinguished from J. conglomeratus by its branching and looser inflorescence. It belongs to a genus of grass-like herbs (Juncus) that grow in boggy places.

Juncus Effusus

Known as the soft rush, Juncus effusus is nearly as common as the most common species, J. conglomeratus.…

Juncus glaucus belongs to a genus of grass-like herbs (Juncus) that grow in boggy places.

Juncus Glaucus

Juncus glaucus belongs to a genus of grass-like herbs (Juncus) that grow in boggy places.

Juncus squamosus belongs to a genus of grass-like herbs (Juncus) that grow in boggy places.

Juncus Squamosus

Juncus squamosus belongs to a genus of grass-like herbs (Juncus) that grow in boggy places.

Fructification of a Jungermannia, its cellular spore-stalk, surrounded at base by some of the leaves, at summit the 4-valved spore-case opening, discharging spores and elaters.

Jungermannia

Fructification of a Jungermannia, its cellular spore-stalk, surrounded at base by some of the leaves,…

"Kadsura japonica. 1. a calyx; 2. a head of stamens; 3. a pistil; 4. a section of a seed." -Lindley, 1853

Kadsura

"Kadsura japonica. 1. a calyx; 2. a head of stamens; 3. a pistil; 4. a section of a seed." -Lindley,…

Four grains united, as in most of the Heath family.

Kalmia

Four grains united, as in most of the Heath family.

The Kauri Pine (Agathis australis) is a coniferous tree peculiar to New Zealand, and forming its most valuable tree. It attains a height of from 120 ft. to 180 ft., and a diameter of from 5 ft. to 12 ft. The wood is straight-grained, easily worked, and susceptible of a high polish, and is largely exported for use as ship masts, deck boards, furniture, and paving blocks. The tree yields a fine resin, kauri gum, used in varnish-making.

Kauri Pine

The Kauri Pine (Agathis australis) is a coniferous tree peculiar to New Zealand, and forming its most…

Kava or Piper methysticum is a crop from the pepper family.

Kava

Kava or Piper methysticum is a crop from the pepper family.

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.