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

Striped Maple seed

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

The strobilus (spike) of a hop plant.

Hop strobilus

The strobilus (spike) of a hop plant.

Flower anatomy. A, sectional view of a flower showing the vertical disposition of whorls. a, sepal of calyx; b, petal of corolla; c, filament of stamen; d, anther of stamen; e, ovary of pistil; f, style of pistil; g, stigma of pistil. B, Plan of the typical flower of an exogenous plant showing the horizontal disposition of its parts. a, sepal; b, petal; c, c, stamens in two different whorls; d, carpel or ovary, inclosing an ovule, attached by its funiculs. C, Various parts of a clove. a, flower of the clove or pink; b, vertical and middle sections of flowers; c, flower showing its male and female portions - six stamen, four large, two small; d, one of the petals; e horizontal section of the ovary showing the insertion of the ovules; f, fruit at the moment of expansion; g, seed, with its funiculus; h, vertical section of seed and its embryonic contents; i, the embryo; k, horizontal section of the embryo and its contents.

Structure of a Flower

Flower anatomy. A, sectional view of a flower showing the vertical disposition of whorls. a, sepal of…

"Details of the fructification of Struthanthus. 1. flower magnified; 2. section of calyx, ovary, and style; 3. fruit invested by the adnate calyx; 4. section of ditto after the calyx is removed; 5. an embryo with 4 cotyledons." -Lindley, 1853

Struthanthus

"Details of the fructification of Struthanthus. 1. flower magnified; 2. section of calyx, ovary, and…

"2. flower of Stylapterus sp.; 3 a. anther in front; 3 b. ditto behind; 4. anther between two lobes of calyx." -Lindley, 1853

Stylapterus

"2. flower of Stylapterus sp.; 3 a. anther in front; 3 b. ditto behind; 4. anther between two lobes…

"Styrax suberifolium. 1. a flower; 2. corolla and stamens; 3. pistil." -Lindley, 1853

Styrax

"Styrax suberifolium. 1. a flower; 2. corolla and stamens; 3. pistil." -Lindley, 1853

"Styrax leiophylla. 1. a flower natural size; 2. ditto cut open; 3. stamen seen in front; 4. ovary, with half the calyx removed; 5. longitudinal section of ovary; 6. transverse ditto; 7. ripe fruit; 8. longitudinal section of seed." -Lindley, 1853

Styrax

"Styrax leiophylla. 1. a flower natural size; 2. ditto cut open; 3. stamen seen in front; 4. ovary,…

That of Succory (its pappus a shallow cup).

Succory

That of Succory (its pappus a shallow cup).

Embryo of Sugar Maple, cut through lengthwise and taken out of the seed.

Sugar Maple

Embryo of Sugar Maple, cut through lengthwise and taken out of the seed.

Pair of samaras of Sugar Maple.

Sugar Maple

Pair of samaras of Sugar Maple.

Embryo of Sugar Maple,(Gray, 1858).

Sugar Maple Embryo

Embryo of Sugar Maple,(Gray, 1858).

Whole embryo of Sugar Maple just beginning to grow.

Sugar Maple Embryo

Whole embryo of Sugar Maple just beginning to grow.

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

Sugar Maple seed

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

Leaf of sundew with half of the tentacles inflexed from stimulation.

Sundew

Leaf of sundew with half of the tentacles inflexed from stimulation.

The Sundews (Drosera rotundifolia) comprise one of the largest genera of carnivorous plants, with over 170 species. These members of the family Droseraceae lure, capture, and digest insects using stalked mucilaginous glands covering their leaf surface.

Sundew

The Sundews (Drosera rotundifolia) comprise one of the largest genera of carnivorous plants, with over…

"Drosera rotundifolia. 1. a flower; 2. a perpendicular section of the ovary; 3. a perpendicular section of a seed." -Lindley, 1853

Common Sundew

"Drosera rotundifolia. 1. a flower; 2. a perpendicular section of the ovary; 3. a perpendicular section…

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).

A type of flower.

Sweet Pea

A type of flower.

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).

"Symplocos laxiflora. 1. expanded flower; 2. corolla cut open; 3. a stamen; 4. longitudinal section of ovary; 5. transverse ditto; 6. ripe fruit; 7. longitudinal section of ditto." -Lindley, 1853

Symplocos

"Symplocos laxiflora. 1. expanded flower; 2. corolla cut open; 3. a stamen; 4. longitudinal section…

"Synaphea dilatata. 1. a flower; 2. one of its lobes; 3. the ovary and style and stigma." -Lindley, 1853

Synaphea

"Synaphea dilatata. 1. a flower; 2. one of its lobes; 3. the ovary and style and stigma." -Lindley,…

A state of flower or fruit in which the carpels are united.

Syncarpous

A state of flower or fruit in which the carpels are united.

"Paronychia capitata. 1. a section of a flower; 2. of the ovary; 3. ripe seed; 4. a section of it." -Lindley, 1853

Algerian Tea

"Paronychia capitata. 1. a section of a flower; 2. of the ovary; 3. ripe seed; 4. a section of it."…

Portion of stem and leaves of Telegraph-plant (Desmodium gyrans), almost of natural size.

Telegraph-plant

Portion of stem and leaves of Telegraph-plant (Desmodium gyrans), almost of natural size.

Tendrils, such as these of the Virginia Creeper, are very slender, leafless branches, used to enable certain plants to climb.

Tendrils

Tendrils, such as these of the Virginia Creeper, are very slender, leafless branches, used to enable…

"Tetratheca hirsuta. 1. the stamens; 2. the pistil, with one of the cells laid open." -Lindley, 1853

Tetratheca

"Tetratheca hirsuta. 1. the stamens; 2. the pistil, with one of the cells laid open." -Lindley, 1853

"Thesium pratense. 1. a flower; 2. the same laid open; 3. half an unripe fruit; 4. placenta and pair of ovules; 5. half the ripe fruit and seed." -Lindley, 1853

Thesium

"Thesium pratense. 1. a flower; 2. the same laid open; 3. half an unripe fruit; 4. placenta and pair…

The Southern Globe Thistle (Echinops ruthenicus) is a species of thistles in the Asteraceae or daisy family.

Southern Globe Thistle

The Southern Globe Thistle (Echinops ruthenicus) is a species of thistles in the Asteraceae or daisy…

"Armeria vulgaris. 1. calyx and stamens; 2. section of corolla; 3. pistil; 4. ovule; 5. embryo." -Lindley, 1853

Sea Thrift

"Armeria vulgaris. 1. calyx and stamens; 2. section of corolla; 3. pistil; 4. ovule; 5. embryo." -Lindley,…

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

Tick-Trefoil

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

A type of flower.

Toad Flax

A type of flower.

Corolla of Toad-Flax, with similar corolla spurred at the base.

Toad-Flax

Corolla of Toad-Flax, with similar corolla spurred at the base.

"Toddalia floribunda. 1. a flower; 2. a pair of carpels, one of which shows its ovule; 3. fruits; 4. a perpendicular section of one of them." -Lindley, 1853

Toddalia

"Toddalia floribunda. 1. a flower; 2. a pair of carpels, one of which shows its ovule; 3. fruits; 4.…

"Tonina fluviatilis. 1. male flower; 2. centre of do.; 3. female and male flowers; 4. section of ripe fruit; 5. seed; 6. section of do." -Lindley, 1853

Tonina fluviatilis

"Tonina fluviatilis. 1. male flower; 2. centre of do.; 3. female and male flowers; 4. section of ripe…

Dipteryx odorata or the tonka bean is the seed from a legume tree of the Fabaceae family.

Tonka Bean

Dipteryx odorata or the tonka bean is the seed from a legume tree of the Fabaceae family.

"Salvadora persica. 1. flower; 2. a section of its fruit." -Lindley, 1853

Toothbrush Tree

"Salvadora persica. 1. flower; 2. a section of its fruit." -Lindley, 1853

Gymnogramme hispida is a species of tree ferns in the Cyatheaceae family.

Tree Fern

Gymnogramme hispida is a species of tree ferns in the Cyatheaceae family.

The fruit of the Tree-of-Heaven, Ailanthus (Keeler, 1915).

Tree of Heaven Seed

The fruit of the Tree-of-Heaven, Ailanthus (Keeler, 1915).

A Tree-Fern, Dicksonia arborescens, with a young one near its base. In front a common herbaceous Fern (Polypodium vulgare) with its creeping stem or rootstock.

Tree-Fern

A Tree-Fern, Dicksonia arborescens, with a young one near its base. In front a common herbaceous Fern…

A section of the trunk of a Tree-Fern.

Tree-Fern Trunk

A section of the trunk of a Tree-Fern.

"Stylidium calcaratum. 1. anthers and stigma, forming the point of the column; 2. capsule split open; 3. seed." -Lindley, 1853

Book Triggerplant

"Stylidium calcaratum. 1. anthers and stigma, forming the point of the column; 2. capsule split open;…

The very short rootstock and strong terminal bud of a Trillium or Birthroot.

Trillium

The very short rootstock and strong terminal bud of a Trillium or Birthroot.

Trillium is a genus of about 40-50 species of perennial herbaceous flowering plants, native to temperate regions of North America and Asia.

Trillium

Trillium is a genus of about 40-50 species of perennial herbaceous flowering plants, native to temperate…

"Showing how to trim a block for cutting longitudinal sections." -Stevens, 1916

Trimming

"Showing how to trim a block for cutting longitudinal sections." -Stevens, 1916

"Collomia gracilis. 1. calyx and corolla; 2. pistil; 3. cross section of a ripe seed-vessel." -Lindley, 1853

Trumpet

"Collomia gracilis. 1. calyx and corolla; 2. pistil; 3. cross section of a ripe seed-vessel." -Lindley,…

A winged seed of the Trumpet-Creeper.

Trumpet-Creeper

A winged seed of the Trumpet-Creeper.

"Tulip bulb; longitudinal section. F, solid stem; B, flower bud; S, leaf-bases serving as bud-scales, and also for the storage of plant food." -Gager, 1916

Tulip Bulb

"Tulip bulb; longitudinal section. F, solid stem; B, flower bud; S, leaf-bases serving as bud-scales,…

The female reproductive organ, pistil, of a Tulip.

Tulip Pistil

The female reproductive organ, pistil, of a Tulip.

Of Tulip-tree, with adnate (and extrorse) anther.

Tulip-tree

Of Tulip-tree, with adnate (and extrorse) anther.

The flower of the Tulip-tree, Liriodendron tulipifera (Keeler, 1915).

Tulip-Tree Flower

The flower of the Tulip-tree, Liriodendron tulipifera (Keeler, 1915).

The fruit of the Tulip-tree, Liriodendron tulipifera (Keeler, 1915).

Tulip-tree Fruit

The fruit of the Tulip-tree, Liriodendron tulipifera (Keeler, 1915).

"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."…

Corm of Indian Turnip.

Turnip

Corm of Indian Turnip.

"Batis maritima. 1. a male cone; 2. a male flower; 3. the same forced open to show the petals; 4. on of the bracteal scales; 5. a female cone; 6. a perpendicular section of the same; 7. a ripe cone; 8. a section of it; 9. a seed; 10. an embryo." -Lindley, 1853

Turtleweed

"Batis maritima. 1. a male cone; 2. a male flower; 3. the same forced open to show the petals; 4. on…

"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 arrangement of flowers.

Umbel

An umbel arrangement of flowers.