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These are the staminate flowers of Shellbark Hickory, Hicoria ovata, (Keeler, 1915).

Shellbark Hickory Flower

These are the staminate flowers of Shellbark Hickory, Hicoria ovata, (Keeler, 1915).

Silicle of Shepherd's Purse.

Shepherd's Purse

Silicle of Shepherd's Purse.

Silicle of Shepherd's Purse, with one valve removed.

Shepherd's Purse Section

Silicle of Shepherd's Purse, with one valve removed.

"Silicles. 1. Of Shepherd's-purse (Bursa Bursa-pastoris). 2. Same, opened, to show the placentae, the seeds, and the two valves. 3. Of Vernal Whitlow-grass, Draba verna. 4. Same, opened, to show the valves, the dissepiment, and the seeds." -Whitney, 1911

Silicles

"Silicles. 1. Of Shepherd's-purse (Bursa Bursa-pastoris). 2. Same, opened, to show the placentae, the…

"The Silicua is a variety of the capsule, composed of two carpels opening from the base upward, and having a framework called the replum, which forms a spurious dissepiment."—Darby, 1855

Silicula

"The Silicua is a variety of the capsule, composed of two carpels opening from the base upward, and…

"Siliques. 1. Of Cardamine bulbosa. 2. Of Raphanus Raphanistrum. 3. Of Heliophila crithmifolia." -Whitney, 1911

Siliques

"Siliques. 1. Of Cardamine bulbosa. 2. Of Raphanus Raphanistrum. 3. Of Heliophila crithmifolia." -Whitney,…

A Silver Maple embryo, taken out of the husk; upper part of growing stem cut off.

Silver Maple Embryo

A Silver Maple embryo, taken out of the husk; upper part of growing stem cut off.

The seeds of the Silver Maple, Acer saccharinum, (Keeler, 1915).

Silver Maple Seed

The seeds of the Silver Maple, Acer saccharinum, (Keeler, 1915).

These are the flowers of the Silverbell-tree, Mohrodendron carolinum, (Keeler, 1915).

Silverbell-Tree Flowers

These are the flowers of the Silverbell-tree, Mohrodendron carolinum, (Keeler, 1915).

Seed of Sisymbrium, cut across to show the incumbent cotyledons.

Sisymbrium

Seed of Sisymbrium, cut across to show the incumbent cotyledons.

Embryo of the Sisymbrium, detached whole.

Sisymbrium Embryo

Embryo of the Sisymbrium, detached whole.

These are the fruit, or samara, of Slippery Elm, Ulmus pubescens, (Keeler, 1915).

Slippery Elm Fruit

These are the fruit, or samara, of Slippery Elm, Ulmus pubescens, (Keeler, 1915).

Of Sneezeweed (Helenium), with its pappus of five scales.

Sneezeweed

Of Sneezeweed (Helenium), with its pappus of five scales.

This is the fruit of the Snowdrop-tree, Mohrodendron dipterum, (Keeler, 1915).

Snowdrop-tree Fruit

This is the fruit of the Snowdrop-tree, Mohrodendron dipterum, (Keeler, 1915).

"Sapindus senegalensis. 1. an expanded flower; 2. a petal; 3. the ovaries before fertilisation; 4. a vertical section of a ripe drupe, showing the embryo." -Lindley, 1853

Soapberry

"Sapindus senegalensis. 1. an expanded flower; 2. a petal; 3. the ovaries before fertilisation; 4. a…

Of Sow-thistle, with its pappus of delicate downy hairs.

Sow-thistle

Of Sow-thistle, with its pappus of delicate downy hairs.

A man walking over a field and sowing seeds.

Sower

A man walking over a field and sowing seeds.

A man spreading seeds.

Sower

A man spreading seeds.

This shows two leaves of Spanish Oak, Quercus digitata, (Keeler, 1915).

Spanish Oak Leaves

This shows two leaves of Spanish Oak, Quercus digitata, (Keeler, 1915).

"Aneilema crispatum; 1. a flower; 2. the calyx and pistil; 3. the capsule; 4, 5, seeds; 6. a section of ditto showing the embryo; 7. the papilla; 8. the embryo." -Lindley, 1853

Spiderwort

"Aneilema crispatum; 1. a flower; 2. the calyx and pistil; 3. the capsule; 4, 5, seeds; 6. a section…

Seed of a St. John's-wort, divided lengthwise; here the whole kernel is embryo.

St. John's-wort

Seed of a St. John's-wort, divided lengthwise; here the whole kernel is embryo.

Stamen with the usual dehiscence of anther down the side of each cell.

Stamen

Stamen with the usual dehiscence of anther down the side of each cell.

Piece of thallus of a Sticta, with section, showing the immersed apothecia; the small openings of these dot the surface.

Sticta

Piece of thallus of a Sticta, with section, showing the immersed apothecia; the small openings of these…

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

Strawberry

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

Longitudinal section of a young strawberry.

Strawberry

Longitudinal section of a young strawberry.

Section of a part of a strawberry

Strawberry

Section of a part of a strawberry

The seeds of the Striped Maple, Acer pennsylvanicum, (Keeler, 1915).

Striped Maple seed

The seeds of the Striped Maple, Acer pennsylvanicum, (Keeler, 1915).

That of Succory (its pappus a shallow cup).

Succory

That of Succory (its pappus a shallow cup).

Pair of samaras of Sugar Maple.

Sugar Maple

Pair of samaras of Sugar Maple.

The seeds of the Sugar Maple, Acer saccharum, (Keeler, 1915).

Sugar Maple seed

The seeds of the Sugar Maple, Acer saccharum, (Keeler, 1915).

Of Sunflower (pappus of two deciduous scales).

Sunflower

Of Sunflower (pappus of two deciduous scales).

This shows part of the fruiting ament of the Swamp Cottonwood, Populus heterophylla, (Keeler, 1915).

Swamp Cottonwood Fruit

This shows part of the fruiting ament of the Swamp Cottonwood, Populus heterophylla, (Keeler, 1915).

This shows the leaf of the Swamp Cottonwood, Populus heterophylla, (Keeler, 1915).

Swamp Cottonwood Leaf

This shows the leaf of the Swamp Cottonwood, Populus heterophylla, (Keeler, 1915).

This shows the erect strobile, or fruit, of the Sweet Birch, Betula lenta (Keeler, 1915).

Sweet Birch Fruit

This shows the erect strobile, or fruit, of the Sweet Birch, Betula lenta (Keeler, 1915).

Sweet-Potato plant forming thickened roots. Some in the middle are just beginning to thicken; one at the left has grown more; one at the right is still larger.

Sweet-Potato

Sweet-Potato plant forming thickened roots. Some in the middle are just beginning to thicken; one at…

These are the fruit of Sycamore, Platanus occidentalis, (Keeler, 1915).

Sycamore Fruit

These are the fruit of Sycamore, Platanus occidentalis, (Keeler, 1915).

A form of a taproot.

Taproot

A form of a taproot.

A form of a taproot.

Taproot

A form of a taproot.

A form of a taproot.

Taproot

A form of a taproot.

Three-ranked arrangement, shown in a piece of the stalk of a Sedge, with the leaves cut off above their bases; the leaves are numbered in order, from 1 to 6.

Three-ranked

Three-ranked arrangement, shown in a piece of the stalk of a Sedge, with the leaves cut off above their…

Three-ranked arrangement, shown in a piece of the stalk of a Sedge. Diagram or cross-section, in one plane; showing two cycles of three.

Three-ranked

Three-ranked arrangement, shown in a piece of the stalk of a Sedge. Diagram or cross-section, in one…

Loment or jointed legume of a Tick-Trefoil (Desmodium).

Tick-Trefoil

Loment or jointed legume of a Tick-Trefoil (Desmodium).

Bulbets in the axils of leaves of a Tiger Lily

Tiger Lily

Bulbets in the axils of leaves of a Tiger Lily

Diagram of flower of Trillium. In this, as in all such diagrams of cross-section of blossoms, the parts of the outer circle represent the calyx; the next, corolla; within, stames (here in two circles of three each, and the cross-section is through the anthers); in the centre, section of three ovaries joined into a compound one of three cells.

Trillium

Diagram of flower of Trillium. In this, as in all such diagrams of cross-section of blossoms, the parts…

A winged seed of the Trumpet-Creeper.

Trumpet-Creeper

A winged seed of the Trumpet-Creeper.

Bulbet-like tubers, such as are occasionally formed on the stem of a Potato-plant above ground.

Tubers

Bulbet-like tubers, such as are occasionally formed on the stem of a Potato-plant above ground.

"Turnera genistoides. 1. a flower cut open; 2. a section of the ovary; 3. a seed; 4. a section of it." -Lindley, 1853

Turnera

"Turnera genistoides. 1. a flower cut open; 2. a section of the ovary; 3. a seed; 4. a section of it."…

"1. flower of Linnaea borealis; 2. the same cut open and showing the interior of the ovary; 3. a cross section of the ovary." -Lindley, 1853

Twinflower

"1. flower of Linnaea borealis; 2. the same cut open and showing the interior of the ovary; 3. a cross…

An umbel

Umbel

An umbel

A Vaucheria; single cell grown on into a much-branched thread; the end of some branches enlarging, and the green contents in one (a) there condensed into a spore.

Vaucheria

A Vaucheria; single cell grown on into a much-branched thread; the end of some branches enlarging, and…

A Vaucheria; spore and the mature spore escaping.

Vaucheria

A Vaucheria; spore and the mature spore escaping.

Valvate-involute aestivation of same in Vine-bower, Clematis Vitialla.

Vine-bower

Valvate-involute aestivation of same in Vine-bower, Clematis Vitialla.

Flower of a Violet

Violet

Flower of a Violet

Its calyx and corolla displayed: the five smaller parts are the sepals; the five intervening larger ones are the petals.

Violet

Its calyx and corolla displayed: the five smaller parts are the sepals; the five intervening larger…

Anatropous ovule of a Violet

Violet

Anatropous ovule of a Violet

"Corynostylis Hybanthus. 1. a set of stamens, each having the connective lengthened beyond the anther, in the form of a scale; 2. a spurred petal; 3. a transverse section of an ovary, showing the three parietal placentae; 4. a ripe fruit; 5. an embryo." -Lindley, 1853

Violet

"Corynostylis Hybanthus. 1. a set of stamens, each having the connective lengthened beyond the anther,…

Seed of a Violet (anatropous): <em>a</em>, hilum; <em>b</em>, rhaphe; <em>c</em>, chalaza.

Violet

Seed of a Violet (anatropous): a, hilum; b, rhaphe; c, chalaza.

Section of seed of Violet; anatropous with straight axile embryo in the albumen.

Seed of Violet

Section of seed of Violet; anatropous with straight axile embryo in the albumen.

Valvate-induplicate aestivation of calyx of common Virgin's-bower.

Virgin's-bower

Valvate-induplicate aestivation of calyx of common Virgin's-bower.

Akene of Virgin's-bower, retaining the feathered style, which aids in dissemination.

Akene of Virgin's-bower

Akene of Virgin's-bower, retaining the feathered style, which aids in dissemination.