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A dense shrub with evergreen leaves and purple flowers, and is used as an ornamental plant. Honey produced with the pollen of the flowers of this plant have been known to be poisonous to human consumption. It is commonly found in Asia.

Rhododendron Ponticum

A dense shrub with evergreen leaves and purple flowers, and is used as an ornamental plant. Honey produced…

"Leafy twig of poplar." -Bergen, 1896

Poplar Leaves

"Leafy twig of poplar." -Bergen, 1896

The branch of a Populus wislizeni, a species of cottonwood tree.

Branch of Populus Wislizeni

The branch of a Populus wislizeni, a species of cottonwood tree.

Part of stem and leaf of Prince's-Feather (Polygonum orientale) with the united sheathing stipules forming a sheath or ocrea.

Prince's-Feather

Part of stem and leaf of Prince's-Feather (Polygonum orientale) with the united sheathing stipules forming…

This is a print that is part of an illustrated Bible that was created by German printmaker Virgil Solis in 1563. It has a border that is richly decorated with fruits, leaves and insects.

Virgil Solis Print

This is a print that is part of an illustrated Bible that was created by German printmaker Virgil Solis…

Covered with hairs, often short and downy.

Pubescent

Covered with hairs, often short and downy.

A tool used in washing the dust off plants. It can also wash the eggs of insects off the leaves before they have a chance to hatch.

Fountain Pump

A tool used in washing the dust off plants. It can also wash the eggs of insects off the leaves before…

With small dots, whichcanoften be seen only with a lens.

Punctate

With small dots, whichcanoften be seen only with a lens.

A woody fern with numerous branches and dark brown, squarrose scales. They are commonly found in New Zealand and Australia.

Polypodium Pustulatum

A woody fern with numerous branches and dark brown, squarrose scales. They are commonly found in New…

Also known as Populus tremuloides. A species of tree native to the cooler areas of North America.

Quaking Aspen

Also known as Populus tremuloides. A species of tree native to the cooler areas of North America.

Leaf of the Quince: <em>b</em>, blade; <em>p</em>, petiole; <em>st</em>, stipules.

Quince

Leaf of the Quince: b, blade; p, petiole; st, stipules.

A flower cluster with the flowers stalked and comming off a commonand more or less elongated axis.

Raceme

A flower cluster with the flowers stalked and comming off a commonand more or less elongated axis.

A raceme, with a general peduncle, pedicels, bracts, and bractlets. Plainly the bracts here answer to the leaves.

Raceme

A raceme, with a general peduncle, pedicels, bracts, and bractlets. Plainly the bracts here answer to…

A raceme

Raceme

A raceme

From left to right: Various forms of radiatte-veined leaves.

Radiate-Veined

From left to right: Various forms of radiatte-veined leaves.

Also known as Campanula rapunculus. "A hardy biennial, cultivated for the use of its fleshy roots in salads, either boiled or in a raw state, generally the latter; the leaves are also used in winter salads."&mdash;Nicholson, 1884

Rampion

Also known as Campanula rapunculus. "A hardy biennial, cultivated for the use of its fleshy roots in…

"Pangium edule. 1. a male flower; 2. an ovary with its sterile stamens; 3. a cross section of an ovary; 4. a perpendicular section of a seed." -Lindley, 1853

Raual

"Pangium edule. 1. a male flower; 2. an ovary with its sterile stamens; 3. a cross section of an ovary;…

Also known as Betula occidentalis. The branch of a Red Birch tree, native to western North America.

Branch of Red Birch

Also known as Betula occidentalis. The branch of a Red Birch tree, native to western North America.

Opposite leaves, in Red Maple.

Red Maple

Opposite leaves, in Red Maple.

Also known as Morus rubra. The branch of a Red Mulberry tree, native to eastern North America, from Ontario and Vermont to southern Florida.

Branch of Red Mulberry

Also known as Morus rubra. The branch of a Red Mulberry tree, native to eastern North America, from…

Also known as Salix laevigata. The branch of a Red Willow tree, native to Pacific Coastal California.

Branch of Red Willow

Also known as Salix laevigata. The branch of a Red Willow tree, native to Pacific Coastal California.

"Ribes rubrum. 1. perpendicular section of a flower; 2. cross section of the ovary; 3. seed; 4. a perpendicular section of it." -Lindley, 1853

Redcurrant

"Ribes rubrum. 1. perpendicular section of a flower; 2. cross section of the ovary; 3. seed; 4. a perpendicular…

Fragment of a Greek relief.

Fragment of a Greek Relief

Fragment of a Greek relief.

This Lectern Relief is details shown from a cathedral in Limoges, France.

Lectern Relief

This Lectern Relief is details shown from a cathedral in Limoges, France.

This Lectern Relief is details shown from a cathedral in Limoges, France.

Lectern Relief

This Lectern Relief is details shown from a cathedral in Limoges, France.

This Lectern Relief is details shown from a cathedral in Limoges, France.

Lectern Relief

This Lectern Relief is details shown from a cathedral in Limoges, France.

Kidney shaped.

Reniform

Kidney shaped.

With a network like surface.

Reticulate

With a network like surface.

Appearing as if rolled back from the margins.

Revolute

Appearing as if rolled back from the margins.

"Rhabdia lycioides. 1. its flower; 2. the corolla opened; 3. a cross section of the ovary; 4. a perpendicular section of a seed." -Lindley, 1853

Rhabdia

"Rhabdia lycioides. 1. its flower; 2. the corolla opened; 3. a cross section of the ovary; 4. a perpendicular…

"Rhododendron pumilum; 1. a calyx and pistil, with all stamens removed; 2. an anther; 3. a ripe capsule burst; 4. a vertical section of a seed." -Lindley, 1853

Rhododendron

"Rhododendron pumilum; 1. a calyx and pistil, with all stamens removed; 2. an anther; 3. a ripe capsule…

Plant of Riccia natans

Riccia

Plant of Riccia natans

Plant of Riccia natans

Riccia

Plant of Riccia natans

Section of a part of the front, showing two immersed spore-cases, and one emptied space.

Riccia

Section of a part of the front, showing two immersed spore-cases, and one emptied space.

Spore-case torn out, and spores; one figure of the spores united; the other of the four separated.

Riccia

Spore-case torn out, and spores; one figure of the spores united; the other of the four separated.

Also known as Betula nigra. The branch of a River Birch tree, native to eastern United States.

Branch of River Birch

Also known as Betula nigra. The branch of a River Birch tree, native to eastern United States.

"Proliferous or monstrous Rose, showing the prolongation of the axis beyond the flower. C, calyx transformed into leaves; P. petals multiplied at the expense of the stamens, which are reduced in number; F, colored leaves representing abortive carpels; A, axis prolonged, bearing an imperfect flower at its apex." &mdash; Encyclopedia Britanica, 1893

Rose

"Proliferous or monstrous Rose, showing the prolongation of the axis beyond the flower. C, calyx transformed…

Anastatica hierochuntina or the Rose of Jericho is member of the Brassicaceae family.

Rose of Jericho

Anastatica hierochuntina or the Rose of Jericho is member of the Brassicaceae family.

A woody perennial herb with fragrant needle-like leaves.

Rosemary

A woody perennial herb with fragrant needle-like leaves.

With the leaves clustered symmetrically around the base of the stem or scape.

Rosette

With the leaves clustered symmetrically around the base of the stem or scape.

This rug is designed with scrolls and leaves of the palm tree in a velvet material. It is used as a decorative floor covering.

Rug

This rug is designed with scrolls and leaves of the palm tree in a velvet material. It is used as a…

Leaf of Ruscus, or Butcher's Broom

Ruscus

Leaf of Ruscus, or Butcher's Broom

"Ruyschia amazonica. 1. a calyx and pistil; 2. a section of the ovary; 3. a seed; 4. the same, with a portion of the testa torn open to show the cotyledons." -Lindley, 1853

Ruyschia

"Ruyschia amazonica. 1. a calyx and pistil; 2. a section of the ovary; 3. a seed; 4. the same, with…

<i>Lolium perenne</i>. A sheath, in botany is "the part of an expanded organ that is rolled around a stem or other body, forming a tube, as in the lower part of the leaves of grasses..." &mdash;Whitney, 1889 <p>This illustration show a single leaf of ryegrass in its sheath.

Ryegrass Leaf with Sheath

Lolium perenne. A sheath, in botany is "the part of an expanded organ that is rolled around a stem or…

A capital letter S with a leafy background.

Leafy Capital S

A capital letter S with a leafy background.

A pink flower that typically blooms in June. The elliptical leaves are dark green, with silver specks that give it a marbled appearance. They are usually found in Europe.

Pulmonaria Saccharata

A pink flower that typically blooms in June. The elliptical leaves are dark green, with silver specks…

Like an arrowhead, with the lobes turned downward.

Sagittate

Like an arrowhead, with the lobes turned downward.

The branch of a Salix amplifolia, a species of willow.

Branch of Salix Amplifolia

The branch of a Salix amplifolia, a species of willow.

The branch of a Salix balsamifera tree, a species of willow.

Branch of Salix Balsamifera

The branch of a Salix balsamifera tree, a species of willow.

The branch of a Salix fluviatilis, a species of willow tree.

Branch of Salix Fluviatilis

The branch of a Salix fluviatilis, a species of willow tree.

The branch of a Salix longipes tree, a species of willow.

Branch of Salix Longipes

The branch of a Salix longipes tree, a species of willow.

The branch of a Salix missouriensis, a species of willow.

Branch of Salix Missouriensis

The branch of a Salix missouriensis, a species of willow.

The branch of a Salix nuttallii, a species of willow.

Branch of Salix Nuttallii

The branch of a Salix nuttallii, a species of willow.

The branch of a Salix sesillilifolia, a species of willow.

Branch of Salix Sesillilifolia

The branch of a Salix sesillilifolia, a species of willow.

Also known as Salix cordata. The branch of a Sand Dune Willow, native to northeast North America.

Branch of Sand Dune Willow

Also known as Salix cordata. The branch of a Sand Dune Willow, native to northeast North America.

Santalum album is a small tropical tree cultivated for its fragrant oil and medicinal uses.

Indian Sandalwood

Santalum album is a small tropical tree cultivated for its fragrant oil and medicinal uses.

Plan of a one-celled ovary of three carpel-leaves, with parietal placentae, cut across below, where it is complete; the upper part showing the top of the three leaves it is composed of, approaching, but not united.

Sandwort

Plan of a one-celled ovary of three carpel-leaves, with parietal placentae, cut across below, where…

"Sapodilla (Sapota zapotilla). (a), the fruit; (b), the same, transversely cut." -Whitney, 1911

Sapodilla

"Sapodilla (Sapota zapotilla). (a), the fruit; (b), the same, transversely cut." -Whitney, 1911

"In 1870, Saxafraga sarmentosa was introduced, being beautifully and more distinctly variegated with white and rose colored markings on the leaves, but it is apt to run back to the original species."&mdash;Heinrich, 1887

Saxafraga Sarmentosa

"In 1870, Saxafraga sarmentosa was introduced, being beautifully and more distinctly variegated with…

Leaf of Sarracenia purpurea, entire, and another with the upper part cut off.

Sarracenia Purpurea

Leaf of Sarracenia purpurea, entire, and another with the upper part cut off.