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"Part of the inflorescence of Heliconia angustifolia; a, stamens and pistil, the surrounding parts being removed." -Lindley, 1853

Heliconia

"Part of the inflorescence of Heliconia angustifolia; a, stamens and pistil, the surrounding parts being…

The flowers have heliconia bicolor at white and tipped with a greenish color. The ovaries and spathes of the flower are scarlet. The leaves have a gracefully arching shape.

Habit and Separate Inflorescence of Heliconia Bicolor

The flowers have heliconia bicolor at white and tipped with a greenish color. The ovaries and spathes…

Heliconia bihai flowers are red or orange. The flowers bloom in July and August. The plant grows to be twelve feet tall.

Heliconia Bihai

Heliconia bihai flowers are red or orange. The flowers bloom in July and August. The plant grows to…

Heliophila pilosa incisa has blue flowers. The leaves are linear and divide in three parts at the point. The lobes are also linear.

Habit and Detached Single Flower or Heliophila Pilosa Incisa

Heliophila pilosa incisa has blue flowers. The leaves are linear and divide in three parts at the point.…

The flowers heads of helipterum humboldtianum are bright yellow. There are numerous flower heads growing in clusters at the end of the stems. The plant grows between one and two feet tall.

Habit and Detached Inflorescence of Helipterum Humboldtianum

The flowers heads of helipterum humboldtianum are bright yellow. There are numerous flower heads growing…

Helleborus caucasicus punctatus is a garden hybrid of hellebore. The flowers are pale green with rosy dotted sepals.

Habit and Detached Single Flower of Hellebore (Helleborus Caucausicus Punctatus)

Helleborus caucasicus punctatus is a garden hybrid of hellebore. The flowers are pale green with rosy…

Helleborus niger altifolius is usually known as major, sometimes as maximus. The flowers are very large, about four inches across.

Helleborus Niger Altifolius

Helleborus niger altifolius is usually known as major, sometimes as maximus. The flowers are very large,…

Helleborus Olympicus flowers are a purplish color. The flowers bloom in spring. Each stem has two or three flowers. The plant grows two feet tall.

Habit and Fully and Partially Expanded Flowers of Helleborus Olympicus

Helleborus Olympicus flowers are a purplish color. The flowers bloom in spring. Each stem has two or…

The common name of hemerocallis is day lily. The middendorfii variety has deep, golden yellow flowers. There are three to four flowers on each head at the end of the stem.

Habit and Detached Head of Flowers of Hemerocallis Middendorfii

The common name of hemerocallis is day lily. The middendorfii variety has deep, golden yellow flowers.…

The common names of heracleum are cow parsley and cow parsnip. The sibiricum variety has yellowish flowers. The flowers bloom in the summer. The plant grows between five and six feet tall.

Heracleum Sibiricum

The common names of heracleum are cow parsley and cow parsnip. The sibiricum variety has yellowish flowers.…

The common names of heracleum are cow parsley and cow parsnip. The sibiricum variety has yellowish flowers. The umbels are large.

Umbel of Heracleum Sibiricum

The common names of heracleum are cow parsley and cow parsnip. The sibiricum variety has yellowish flowers.…

"4. flower of Heterostemma acuminatum; 5. one of its anthers; 6. its pollen masses." -Lindley, 1853

Heterostemma

"4. flower of Heterostemma acuminatum; 5. one of its anthers; 6. its pollen masses." -Lindley, 1853

The common name of heuchera is alum root. The glabra variety has small white flowers. The flowers bloom in summer. The plant grows to be one foot tall.

Heuchera Glabra

The common name of heuchera is alum root. The glabra variety has small white flowers. The flowers bloom…

Hibbertia perfoliata flowers are pale yellow. The flowers bloom in summer. The leaves are edged with minute, distant teeth.

Flowering Branch of Hibbertia Perfoliata

Hibbertia perfoliata flowers are pale yellow. The flowers bloom in summer. The leaves are edged with…

Hibiscus coccineus flowers are bright scarlet. The flowers bloom in July and August. The shrubs grow between four and eight feet tall. These shrubs are native to the marshy areas of Florida and Georgia.

Flowering Branch of Hibiscus Coccineus

Hibiscus coccineus flowers are bright scarlet. The flowers bloom in July and August. The shrubs grow…

Magnified pollen of Hibiscus and other Mallow plants, beset with prickly projections.

Hibiscus pollen

Magnified pollen of Hibiscus and other Mallow plants, beset with prickly projections.

Hibiscus rosa-sinensis flowers vary in color. The flowers are large and are single, semi, or wholly double. The flowers bloom in the summer. The shrub grows between ten and fifteen feet tall.

Flowering Branch of Hibiscus Rosa-Sinensis

Hibiscus rosa-sinensis flowers vary in color. The flowers are large and are single, semi, or wholly…

The flowers of hibiscus roseus are rose colored. The flowers are large and grow alone on the stems. The shrub grows to be three feet tall.

Flowering Branch of Hibiscus Roseus

The flowers of hibiscus roseus are rose colored. The flowers are large and grow alone on the stems.…

The flowers of hibiscus syriacus vary in color. The flowers are large and grow single or double on the stem. The flowers bloom in August. The shrub grows six feet tall.

Flowering Branch of Hibiscus Syriacus

The flowers of hibiscus syriacus vary in color. The flowers are large and grow single or double on the…

The common name of hibiscus trionum is bladder ketmia. The flowers are yellow with a purple center. The flowers bloom in summer. The shrub grows two feet tall.

Flowering Branch of Hibiscus Trionum

The common name of hibiscus trionum is bladder ketmia. The flowers are yellow with a purple center.…

"When the ovary is composed of several carpels, the carpels are arranged with the midrib placed outwardly, and the margins turned inward toward the center, as seen in the transverse section of the Hibiscus, which is composed of five carpels, with their margins meeting in the center, forming a central placenta, to which the seeds are attached."

Section of Hibiscus

"When the ovary is composed of several carpels, the carpels are arranged with the midrib placed outwardly,…

"Hippocratea Arnottiana. 1. a flower; 2. a cross section of the ovary; 3. ripe fruit." -Lindley, 1853

Hippocratea

"Hippocratea Arnottiana. 1. a flower; 2. a cross section of the ovary; 3. ripe fruit." -Lindley, 1853

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 flowers of holboellia latifolia are purple or greenish. The flowers are very fragrant. The flowers bloom in March. The shrub grows up to twenty feet tall.

Flowering Branch and Detached Female Flowers of Holboellia Latifolia

The flowers of holboellia latifolia are purple or greenish. The flowers are very fragrant. The flowers…

Pottery is the ceramic ware made by potters. Major types of pottery include earthenware, stoneware, and porcelain. The places where such wares are made are called potteries. Pottery is one of the oldest human technologies and art-forms, and remains a major industry today. Ceramic art covers the art of pottery, whether in items made for use or purely for decoration.

Plant Holder

Pottery is the ceramic ware made by potters. Major types of pottery include earthenware, stoneware,…

Ilex aquifolium (Holly, or European Holly to distinguish it from related species) is a species of holly native to western and southern Europe, northwest Africa and southwest Asia

Holly

Ilex aquifolium (Holly, or European Holly to distinguish it from related species) is a species of holly…

Holy Ghost Flower, or Dove Flower, is the common name of peristeria elata. The flowers are sweet scented and about one and a half inches across. The flowers spikes reach three feet or more in height.

Holy Ghost Flower

Holy Ghost Flower, or Dove Flower, is the common name of peristeria elata. The flowers are sweet scented…

The honeysuckle is a flowering plant of the heath family.

Honeysuckle

The honeysuckle is a flowering plant of the heath family.

Of the Honeysuckle family (Caprifoliaceae), the bush honeysuckle (Diervilla Lonicera).

Bush Honeysuckle

Of the Honeysuckle family (Caprifoliaceae), the bush honeysuckle (Diervilla Lonicera).

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…

Hoop petticoat is the common name of narcissus bulbocodium. The flowers are bright yellow. The flowers bloom in April and May.

Hoop Petticoat

Hoop petticoat is the common name of narcissus bulbocodium. The flowers are bright yellow. The flowers…

The hop (Humulus) is a small genus of flowering plants, native to the temperate Northern Hemisphere. The female flowers, commonly called hops, are used as flavoring and stabilizers during beer brewing. The hop is part of the family Cannabaceae, which also includes the genus cannabis (also known as hemp). Hops are the female flower cones of the hop plant (Humulus lupulus). They are used primarily as a flavoring and stability agent in beer, and also in other beverages and in herbal medicine. The first documented use in beer is from the eleventh century. Hops contain several characteristics favorable to beer, balancing the sweetness of the malt with bitterness, contributing flowery, citrus, fruity or herbal aromas, and having an antibiotic effect that favors the activity of brewer's yeast over less desirable microorganisms. The hop plant is a vigorous climbing herbaceous perennial, usually grown up strings in a field called a hopfield, hop garden or hop yard. Many different varieties of hops are grown by farmers all around the world, with different types being used for particular styles of beer.

Hops

The hop (Humulus) is a small genus of flowering plants, native to the temperate Northern Hemisphere.…

Common horse chestnut is the common name of <i>Aesculus hippocastanum</i>. The tree is large, between sixty and eighty feet tall. The flowers are white tinged with red.

Opening Foliage of Common Horse Chestnut

Common horse chestnut is the common name of Aesculus hippocastanum. The tree is large, between sixty…

"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…

An illustration of a fertile branch of horsetail and spore of equisetum with unrolled elaters.

Horsetail

An illustration of a fertile branch of horsetail and spore of equisetum with unrolled elaters.

The common name of houstonia caerulea is bluets. The flowers are usually a light blue color but they are sometimes white. Each stem has one flower. The flowers bloom in the summer.

Houstonia Caerulea

The common name of houstonia caerulea is bluets. The flowers are usually a light blue color but they…

The common name of hoya carnosa is wax flower. This form has variegated leaves.

Hoya Carnosa Variegata

The common name of hoya carnosa is wax flower. This form has variegated leaves.

The common name of hoya carnosa is wax flower. The flowers are a pinkish white color. The flowers bloom in the summer.

Flowering Stem of Hoya Carnosa

The common name of hoya carnosa is wax flower. The flowers are a pinkish white color. The flowers bloom…

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.

The flower heads of humea elegans are brownish red, pink, or crimson. The flowers bloom July to October. The shrub grows between five and six feet tall.

Humea Elegans

The flower heads of humea elegans are brownish red, pink, or crimson. The flowers bloom July to October.…

A group of humming birds with particularly long and narrow beaks, well-adapted for sipping nectar from flowers.

Hummingbirds

A group of humming birds with particularly long and narrow beaks, well-adapted for sipping nectar from…

A group of humming birds, two of which are vying for a flower's nectar.

Hummingbirds

A group of humming birds, two of which are vying for a flower's nectar.

The common name of humulus lupulus is hop or common hop. The flowers are greenish yellow. The flowers bloom in the summer. The heads of the fruit are used in brewing.

Portion of Female Inforlescence of Humulus Lupulus

The common name of humulus lupulus is hop or common hop. The flowers are greenish yellow. The flowers…

A flowering plant native to the eastern Mediterranean region.

Hyacinth

A flowering plant native to the eastern Mediterranean region.

Common hyacinth is the common name of hyacinthus orientalis. The flowers are fragrant and clustered. The flowers bloom in spring.

Common Hyacinth

Common hyacinth is the common name of hyacinthus orientalis. The flowers are fragrant and clustered.…

The flowers of the double flowered garden hyacinth are small and rosette like. This variety is not cultivated as often as the single flowered variety.

Double Flowered Variety of the Garden Hyacinth

The flowers of the double flowered garden hyacinth are small and rosette like. This variety is not cultivated…

"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

Hippeastrums are native to tropical South America. The flowers range in color from red to white. Some flowers are also blended with a variety of colors.

Hybrid Hippeastrums

Hippeastrums are native to tropical South America. The flowers range in color from red to white. Some…

"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."…

Hydrangea hortensis is the common hydrangea. The flowers vary in color according to the soil in which the plant is grown. The flowers bloom April to September. The plant grows between two and three feet tall.

Hydrangea Hortensis

Hydrangea hortensis is the common hydrangea. The flowers vary in color according to the soil in which…

Hydrangea paniculata grandiflora has white flowers. The flowers are small and star shaped. The flowers bloom in summer and autumn.

Habit and Detached Single Flower of Hydrangea Paniculata Grandiflora

Hydrangea paniculata grandiflora has white flowers. The flowers are small and star shaped. The flowers…

The flowers of hydrolea spinosa are pale blue. The flowers bloom in July. The stem is thorny.

Flowering Stem of Hydrolea Spinosa

The flowers of hydrolea spinosa are pale blue. The flowers bloom in July. The stem is thorny.

Hymenocallis andreana has white flowers. The flowers grow on slender, one flowered scapes. The leaves are pale green. The plant grows one and a half feet tall.

Hymenocallis Andreana

Hymenocallis andreana has white flowers. The flowers grow on slender, one flowered scapes. The leaves…

The orders of hypericacea, guttiferae, and tamaricaceae are pictured. The flowers of these orders that are illustrated include (1) hypericum, (2) vismia, (3) garcinia, and (4) tamarix.

Orders of Hypericaceae, Guttiferae, and Tamaricaceae

The orders of hypericacea, guttiferae, and tamaricaceae are pictured. The flowers of these orders that…

"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.…

The common names of hypericum androsaemum are sweet amber and common tutsan. The flowers are large and grow at the ends of the stems. The flowers bloom in summer. The shrub grows to be three feet tall.

Habit and Detached Flower of Hypericum Androsaemum

The common names of hypericum androsaemum are sweet amber and common tutsan. The flowers are large and…

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…

The common names of hypericum perforatum are common hypericum and St. John's wort. The flowers are bright yellow and grow in clusters at the end of the stems. The petals are marked with black dots. The shrub grows between one and three feet tall.

Dehiscing Capsule and Portion and Inflorescence of Hypericum Perforatum

The common names of hypericum perforatum are common hypericum and St. John's wort. The flowers are bright…

"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…

Hypoxis erecta flowers are yellow and star shaped. Each scape has four flowers. The leaves are linear and taper to a point.

Scape and Leaf of Hypoxis Erecta

Hypoxis erecta flowers are yellow and star shaped. Each scape has four flowers. The leaves are linear…