ClipArt ETC
Loose spiral duct passing into annular.

Spiral Ducts

Loose spiral duct passing into annular.

Scalariform ducts of a Fern; part of a bundle, prismatic by pressure.

Spiral Ducts

Scalariform ducts of a Fern; part of a bundle, prismatic by pressure.

A spore.

Spore

A spore.

An illustration of a germinating spore of the common polypody: sp, exospore; k, first root-hair.

Germinating Spore of the Common Polypody

An illustration of a germinating spore of the common polypody: sp, exospore; k, first root-hair.

An illustration of a germinating spore of the common polypody: sp, exospore; k, first root-hair.

Germinating Spore of the Common Polypody

An illustration of a germinating spore of the common polypody: sp, exospore; k, first root-hair.

Magnified section of a spore-case with some spores.

Spore-Case

Magnified section of a spore-case with some spores.

Part of the head or spike of spore-cases, with some of the latter taken off.

Spore-Cases

Part of the head or spike of spore-cases, with some of the latter taken off.

"One sporophyll with empty sporangia."—Finley, 1917

Sporophyll

"One sporophyll with empty sporangia."—Finley, 1917

"The maple spot gall, so common on the leaves of the red maple, is made by the fungus-gnat of the order Diptera." — Davison, 1906

Maple spot gall

"The maple spot gall, so common on the leaves of the red maple, is made by the fungus-gnat of the order…

"Longitudinal section through fertilized ovule of a spruce. p, pollen grains; t, pollen tubes; n neck of the archegonium; a, body of archegonium with nucleus; e, embryo sac filled with endosperm." -Bergen, 1896

Spruce Ovule

"Longitudinal section through fertilized ovule of a spruce. p, pollen grains; t, pollen tubes; n neck…

Euphorbia caputmedusae or the Medusa's Head is a spurge from the diverse genus, Euphorbia.

Medusa's Head Spurge

Euphorbia caputmedusae or the Medusa's Head is a spurge from the diverse genus, Euphorbia.

Staminate flower of a Squash, with the corolla and upper part of the calyx cut away.

Squash

Staminate flower of a Squash, with the corolla and upper part of the calyx cut away.

Staminate flower of a Squash, with the anthers cut across.

Squash

Staminate flower of a Squash, with the anthers cut across.

Embryo of squash.

Squash

Embryo of squash.

Embryo of squash, seen edgewise.

Squash

Embryo of squash, seen edgewise.

"Canadian St.-John's-wort (Hypericum Canadense). a, leaf; b, seed-capsule." -Whitney, 1911

Canadian St. John's Wort

"Canadian St.-John's-wort (Hypericum Canadense). a, leaf; b, seed-capsule." -Whitney, 1911

"Marsh St.-John's-wort (Triadenum Virginicum). a, flower; b, seed-capsule." -Whitney, 1911

Marsh St. John's Wort

"Marsh St.-John's-wort (Triadenum Virginicum). a, flower; b, seed-capsule." -Whitney, 1911

A single flower of stachys sylvatica.

Flower of stachys sylvatica

A single flower of stachys sylvatica.

"1. Stackhousia; 2. its corolla; 3. calyx, &c." -Lindley, 1853

Stackhousia

"1. Stackhousia; 2. its corolla; 3. calyx, &c." -Lindley, 1853

Extrorse or outward facing stamens of the flower of Hippocratea, a genus of staff vine.

Extrorse Stamens of Flower of Staff Vine

Extrorse or outward facing stamens of the flower of Hippocratea, a genus of staff vine.

The stamen of the Papaw, (Gray, 1858).

Stamen

The stamen of the Papaw, (Gray, 1858).

Stamens and pistil of Mustard, (Gray, 1858).

Stamen

Stamens and pistil of Mustard, (Gray, 1858).

Stamens of Mallow united in a tube.

Stamen

Stamens of Mallow united in a tube.

A tuft of stamens with the petal-like scale of the American Linden.

Stamen

A tuft of stamens with the petal-like scale of the American Linden.

The stamens and pistil of the wild Geranium.

Stamen

The stamens and pistil of the wild Geranium.

<em>a</em>, filament: <em>b</em>, anther, discharging pollen.

Stamen

a, filament: b, anther, discharging pollen.

Cells of anther each opening by an uplifted valve.

Stamen of Barberry

Cells of anther each opening by an uplifted valve.

Very short filament bearing a single anther-cell; it is open from top to bottom, showing the pollen within.

Stamen of Globe Amaranth

Very short filament bearing a single anther-cell; it is open from top to bottom, showing the pollen…

Stamen of Mallow; the anther supposed to answer to that of Pentstemon pubescens, but the cells completely confluent into one.

Stamen of Mallow

Stamen of Mallow; the anther supposed to answer to that of Pentstemon pubescens, but the cells completely…

Stamen of Moonseed, with anther cut across; this 4-celled, or rather 4-locellate.

Stamen of Moonseed

Stamen of Moonseed, with anther cut across; this 4-celled, or rather 4-locellate.

Stamen of Pentstemon pubescens; the two-anther-cells diverging, and almost confluent.

Stamen of Pentstemon

Stamen of Pentstemon pubescens; the two-anther-cells diverging, and almost confluent.

A stamen, with the anther opening, of the Barberry, (Gray, 1858).

Barberry Stamen

A stamen, with the anther opening, of the Barberry, (Gray, 1858).

Stamen of Laurel, magnified, (Gray, 1858).

Laurel Stamen

Stamen of Laurel, magnified, (Gray, 1858).

Stamens of the flower of the Morning Glory.

Morning Glory Stamen

Stamens of the flower of the Morning Glory.

Stamen of the flower of the Morning Glory.

Morning Glory Stamen

Stamen of the flower of the Morning Glory.

Stamens of the mint family. Of a Monarda: the two anther-cells with bases divergent so that they are transverse to the filament, and their contiguous tips confluent, so as to form one cell opening by a continuous line. Fig 301; Of a Calamintha: the broad connective separating the two cells. Fig 302; Of a Sage (Salvia Texana; with long and slender connective resembling forks of the filament, one bearing a good anther-cell wholly wanting. Fig 304; Of a White Sage, Audibertia grandiflora; the lower fork of connective a mere vestige. Fig. 305; Of another White Sage (A. stachyoides), the lower fork of connective suppressed.

Stamens

Stamens of the mint family. Of a Monarda: the two anther-cells with bases divergent so that they are…

Cells opening by a terminal hole.

Stamens of Pyrola

Cells opening by a terminal hole.

Staminate flower of Moonseed.

Staminate Moonseed

Staminate flower of Moonseed.

Flower of Standing Cypress (Gilia coronopifolia); gamopetalous: the tube answering to the long claws of the Soapwort, except that they are coalescent: the limb or border (the spreading part above) is <em>five-parted</em>, that is, the petals not there united except at very base.

Standing Cypress

Flower of Standing Cypress (Gilia coronopifolia); gamopetalous: the tube answering to the long claws…

Stapelia is a genus of large flowering plants of the Apocynaceae family.

Stapelia

Stapelia is a genus of large flowering plants of the Apocynaceae family.

"Star of Bethlehem, or Ornithogalum, a genus of bulbous plants belonging to the order Liliacae."&mdash;Finley, 1917

Star of Bethlehem

"Star of Bethlehem, or Ornithogalum, a genus of bulbous plants belonging to the order Liliacae."—Finley,…

Stamen of a Star of Bethlehem.

Stamen of Star of Bethlehem

Stamen of a Star of Bethlehem.

Some magnified starch-grains, in two cells of a potato.

Starch-Grains

Some magnified starch-grains, in two cells of a potato.

The starflower or Calytrix and a section of its flower.

Starflower

The starflower or Calytrix and a section of its flower.

Short piece of stem of Flax, magnified, showing the bark, wood, and pith in a cross section.

Stem of Flax

Short piece of stem of Flax, magnified, showing the bark, wood, and pith in a cross section.

Cross section of stem of Myriophyllum, with air canals.

Cross-section Stem

Cross section of stem of Myriophyllum, with air canals.

Cross-section of stem of Ricinus communis, showing ring of secondary xylem.

Cross-section Stem

Cross-section of stem of Ricinus communis, showing ring of secondary xylem.

The central part of the stem is the pith, then is the cellular tissue and finally the bark.

Woody Stem

The central part of the stem is the pith, then is the cellular tissue and finally the bark.

The central part of the stem is the pith, then is the cellular tissue and finally the bark.

Woody Stem

The central part of the stem is the pith, then is the cellular tissue and finally the bark.

"Stilbe Pinastra. 1. a flower; 2. the same cut open; 3. a perpendicular section of an ovary." -Lindley, 1853

Stilbe

"Stilbe Pinastra. 1. a flower; 2. the same cut open; 3. a perpendicular section of an ovary." -Lindley,…

Stellaria holostea is an ornamental plant also known as Addersmeat or the Greater Stitchwort.

Greater Stitchwort

Stellaria holostea is an ornamental plant also known as Addersmeat or the Greater Stitchwort.

Flower of Sedum ternatum.

Stonecrop

Flower of Sedum ternatum.

The Sedum acre or Goldmoss Stonecrop is a creeping plant native to Europe.

Goldmoss Stonecrop

The Sedum acre or Goldmoss Stonecrop is a creeping plant native to Europe.

"1. Chara vulgaris; 2. a portion of a branch with a nucule and globule; 3. the globule more magnified; 4. the spiral tubes of the latter; 5. a nucule cut open; 6. a nucule in germination." -Lindley, 1853

Common Stonewort

"1. Chara vulgaris; 2. a portion of a branch with a nucule and globule; 3. the globule more magnified;…

This is a young, forming strawberry, divided lengthwise,(Gray, 1858).

Strawberry

This is a young, forming strawberry, divided lengthwise,(Gray, 1858).

This is a classification of a type of fruit.

Strawberry

This is a classification of a type of fruit.

"In botany, a runner; a weak, creeping shoot sent out from the bottom of the stem, and rooting and forming new plants at the nodes, as in the strawberry." -Whitney, 1911

Strawberry Flagellum

"In botany, a runner; a weak, creeping shoot sent out from the bottom of the stem, and rooting and forming…

"3. perpendicular section of a flower of Fragaria indica (Duchesnea indica); 4. the same section of its half ripe fruit, showing the torus covered with carpels; 5. a single carpel of it; 6. one of its achaenia cut open to show the seed inside." -Lindley, 1853

Mock Strawberry

"3. perpendicular section of a flower of Fragaria indica (Duchesnea indica); 4. the same section of…

"2. flower of Fragaria vesca; 3. a section of it." -Lindley, 1853

Woodland Strawberry

"2. flower of Fragaria vesca; 3. a section of it." -Lindley, 1853

The Woodland Strawberry (Fragaria vesca) is a flowering plant in Rosaceae, the rose family.

Woodland Strawberry

The Woodland Strawberry (Fragaria vesca) is a flowering plant in Rosaceae, the rose family.