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Leaves sessile or very short petioled; flowers showy.

Rhexia

Leaves sessile or very short petioled; flowers showy.

The Chilean Rhubarb (Gunnera tinctoria) is a large-leaved plant in the Gunneraceae family. It was also known as the synonym Gunnera scabra.

Chilean Rhubarb

The Chilean Rhubarb (Gunnera tinctoria) is a large-leaved plant in the Gunneraceae family. It was also…

Spikelets with only 1 or 2 scales enclosing acenes; perianth-bristles usually present.

Rhynchospora

Spikelets with only 1 or 2 scales enclosing acenes; perianth-bristles usually present.

Divisions of plant body fine and many; plant body usualy floating below the surface.

Riccia

Divisions of plant body fine and many; plant body usualy floating below the surface.

Divisions of plant body coarse, two lobed; floating on surface.

Ricciocarpus

Divisions of plant body coarse, two lobed; floating on surface.

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.

Also known as Ulmus thomasii. The branch of a Rock Elm tree, native to the midwestern United States.

Branch of Rock Elm

Also known as Ulmus thomasii. The branch of a Rock Elm tree, native to the midwestern United States.

Flowers yellow.

Rorippa

Flowers yellow.

Leaves with central mid-vein and smaller veins branching from this.

Rorippa

Leaves with central mid-vein and smaller veins branching from this.

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.

Flowers with small appendages between the sepals.

Rotala

Flowers with small appendages between the sepals.

Plant with broad leaves, many basal; flowers stalked and drooping.

Rumex

Plant with broad leaves, many basal; flowers stalked and drooping.

Leaf-base apparently inflated.

Ruppia

Leaf-base apparently inflated.

"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 floral capital S with an ornate leaf.

Capital Letter S

A floral capital S with an ornate leaf.

A capital letter S with a leafy background.

Leafy Capital S

A capital letter S with a leafy background.

Flowers white, or, if pink, with a yellow or green eye in the center.

Sabatia

Flowers white, or, if pink, with a yellow or green eye in the center.

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…

Spikelets inflated or gibbous at base.

Sacciolepis

Spikelets inflated or gibbous at base.

Leaves from base of scape bearing evident white flowers in racemes; roots without crss-constrictions.

Sagittaria

Leaves from base of scape bearing evident white flowers in racemes; roots without crss-constrictions.

lowest flowers with only carpels, or with only stamens.

Sagittaria

lowest flowers with only carpels, or with only stamens.

Like an arrowhead, with the lobes turned downward.

Sagittate

Like an arrowhead, with the lobes turned downward.

Leaves over four times as long as broad.

Salix

Leaves over four times as long as broad.

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.

Leaves not over twice as long as broad.

Samalus

Leaves not over twice as long as broad.

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.

"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…

"Leaves of Sarracenta purpurea. A, attractive surface of lid; B, conducting, C, glandular, and D, detentive surface; magnified." &mdash; The Encyclopedia Britannica, 1893

Sarracenta

"Leaves of Sarracenta purpurea. A, attractive surface of lid; B, conducting, C, glandular, and D, detentive…

Also known as Amelanchier alnifolia. The branch of a Saskatoon shrub, native to North America, primarily from Alaska to Western Canada.

Branch of Saskatoon

Also known as Amelanchier alnifolia. The branch of a Saskatoon shrub, native to North America, primarily…

A branch of a Sassafras plant, native to eastern North America.

Branch of Sassafras

A branch of a Sassafras plant, native to eastern North America.

Leaves - simple; alternate; edge entire or lobed. Outline - when the edge is entire usually oval or egg-shape; when lobed usually broader and reverse egg-shape. Apex - of the leaf or of the lobes rounded or slightly blunt-pointed. Base - pointed or wedge-shape. Leaf - variable in size, dark, thin, smooth; rather shining above; the lobes, when resent, two or three in number and usually more or less bulging, with the hollows always rounded. Bark - obliquely and curiously furrowed and broken, gray without, reddish within; young twigs yellowish. Flowers - greenish-yellow, in clusters. May, June. Fruit - oval, one-seeded, blue, with a reddish, club shaped stem; pungent. Found - from Southwestern Vermont, southward and westward. General Information - a tree fifteen to fifty feet high with light and soft wood. All parts of the tree have a pleasant, spicy taste and fragrance. From the bark of the roots a powerful aromatic stimulant is obtained.

Genus Sassafras, Nees. (Sassafras)

Leaves - simple; alternate; edge entire or lobed. Outline - when the edge is entire usually oval or…

Stems with no sheaths; flowers white, fragrant.

Saururus

Stems with no sheaths; flowers white, fragrant.

"Strawberry False-worm (Emphytus maculatus). 1, 2 pupa, ventral and lateral views (line shows natural size); 3, fly, enlarged (wings on one side detached); 4, larva; 5, fly with wings closed; 6, larva curled up; 7, coccoon; 8, antenna; 9, egg. (4, 5, 6, and 7 natural size; 8 and 9 enlarged.)" -Whitney, 1911

Strawberry Sawfly

"Strawberry False-worm (Emphytus maculatus). 1, 2 pupa, ventral and lateral views (line shows natural…

A wide-creeping fern with long reddish-brown fronds, which grow to be approximately 1 foot in length. They are usually found in New Zealand.

Pteris Scaberula

A wide-creeping fern with long reddish-brown fronds, which grow to be approximately 1 foot in length.…

Also known as Quercus coccinea. The branch of a red oak tree native to the eastern United States.

Branch of Scarlet Oak

Also known as Quercus coccinea. The branch of a red oak tree native to the eastern United States.

Leaves - simple; alternate; edge deeply lobed (edges of lobes mostly entire, but notched and toothed towards the ends). Outline - broadly oval or broadly reverse egg-shape. Base - very short wedge-shape or squared. Ends of the lobes and of the teeth pointed and bristle-tipped. Leaf - four to eight inches long, bright green above, slightly lighter below; both surfaces smooth and shining. Lobes - five to nine, usually seven with the hollows rounded and very broad, and reaching about two thirds of the way to the middle rib. Most of the lobes widen and are deeply notched toward their end. Bark - of trunk, thick and rough, usually not quite as dark or as straight-furrowed as that of the Black Oak. The inner bark reddish. Acorns - variable. Cup - very thick, top-shaped, with large somewhat triangular egg-shaped, scales. Nut - one half to three fourths of an inch long; rounded or rounded egg-shape, about one third covered by the cup; kernel bitter and whitish. October. Found - from Southern Maine southward and westward; most common in the Middle and Southern States. General Information - A tree fifth to ninety feet high, with wood of less value than some of the other oaks. In the fall the leaves turn to a bright scarlet, or orange0scarlet, or crimson and red. They often cling throughout the winter. Quercus, possible from a Celtic word meaning to inquire, because it was among the oaks that the Druids oftenest practised their rites.

Genus Quercus, L. (Oak)

Leaves - simple; alternate; edge deeply lobed (edges of lobes mostly entire, but notched and toothed…

Flwers or fruits hidden by overlapping scales.

Scirpus

Flwers or fruits hidden by overlapping scales.

Style not swollen as base.

Scirpus

Style not swollen as base.

Achene exposed.

Scleria

Achene exposed.

Also known as Pandanus utilis. It is a tropical tree with an edible fruit. It is native to Madagascar and Mauritius.

Screwpine

Also known as Pandanus utilis. It is a tropical tree with an edible fruit. It is native to Madagascar…

calyx of flower bearing a crest above.

Scutellaria

calyx of flower bearing a crest above.

Leaves - simple; alternate; edge very finely sharp-toothed. Outline - long and narrow, often "scythe-shaped." Apex - long, taper-pointed. Base - gradually narrowing and pointed or slightly rounded. Leaf/Stem - short. Stipules - (two small, leaf-like appendages at the base of the leaf-stem), not falling off when young, as in most of the willows; moon-shaped, finely toothed, wider than long. Leaf - four to eight inches long; green and smooth above and below (silky-downy when young). Found - on low ground from New England to the Middle States and westward. General Information - A small tree (or sometimes a shrub). The persistent stipules and the length of the leaf furnish ready signs for distinguishing it from S. nigra. Salix from two Celtic words meaning "near" and "water."

Genus Salix, L. (Willow)

Leaves - simple; alternate; edge very finely sharp-toothed. Outline - long and narrow, often "scythe-shaped."…

Also known as Alnus maritima. The branch of a Seaside Alder, native to the United States.

Branch of Seaside Alder

Also known as Alnus maritima. The branch of a Seaside Alder, native to the United States.

Selerolepis

Selerolepis

Selerolepis

"Self-heal. (Prunella vulgaris). The upper part of the stem with flowers. a, the calyx; b, the corolla; c, a leaf; d, a bract from the inflorescence." -Whitney, 1911

Self-Heal

"Self-heal. (Prunella vulgaris). The upper part of the stem with flowers. a, the calyx; b, the corolla;…

A bright brown fern with fronds reaching between 1 foot and 1.5 feet. They are commonly found in the East Indies.

Pteris Semipinnata

A bright brown fern with fronds reaching between 1 foot and 1.5 feet. They are commonly found in the…

"Flowering branch of Senna (Cassia obovata). a, a pod." -Whitney, 1911

Senna

"Flowering branch of Senna (Cassia obovata). a, a pod." -Whitney, 1911

A member of the outermost circle of flower parts.

Sepal

A member of the outermost circle of flower parts.

Also known as Ulmus serotina. A branch of a September Elm tree, native to a select few states in North America.

Branch of September Elm

Also known as Ulmus serotina. A branch of a September Elm tree, native to a select few states in North…

Toothed like a saw.

Serrate

Toothed like a saw.

Spikelets spineless (awnless) but subtended by several bristles; panicle often nodding.

Setaria

Spikelets spineless (awnless) but subtended by several bristles; panicle often nodding.

Leaves - simple; alternate; edge very sharply and finely toothed. Outline - long oval, long egg-shape, or reverse egg-shape. Apex - sometimes bristle-pointed. Base - slightly heart-shaped or rounded. Leaf - usually two to three inches long, somewhat downy when young, afterward very smooth above and below. Bark - of branches and twigs usually purplish-brown and very smooth. Flowers - large, white, in long and loose clusters at the ends of the branchlets; appearing before the leaves. April, May. Fruit - berry-like, round, purplish, sweet, and edible. June. Found - in woods and along streams; common at the North; rare in the South. General Information - A small tree, ten to thirty feet high, or in some of its numerous forms reduced to a low shrub; noticeable and showy in early spring because of its flowers. The variety A. C. oblongifolia, T. and G., differs somewhat from the above in the dimensions of the flowers and flower clusters, etc. The name "shad-bush" is given because the trees blossom about the time that the shad "run".

Genus Amelanchier, Medik (June-berry)

Leaves - simple; alternate; edge very sharply and finely toothed. Outline - long oval, long egg-shape,…