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This is the fruit, or samara, of Blue Ash, Fraxinus quadrangulata, (Keeler, 1915).

Blue Ash Fruit

This is the fruit, or samara, of Blue Ash, Fraxinus quadrangulata, (Keeler, 1915).

"Vaccinium amoenum. 1. a flower; 2. a perpendicular section of it without the corolla; 3. a cross section of an ovary; 4. an anther; 5. half a seed." -Lindley, 1853

Large-Cluster Blueberry

"Vaccinium amoenum. 1. a flower; 2. a perpendicular section of it without the corolla; 3. a cross section…

Stage of a species of Botrydium, a globose cell.

Botrydium

Stage of a species of Botrydium, a globose cell.

Full-grown plant, extended and ramified below in a root-like way.

Botrydium

Full-grown plant, extended and ramified below in a root-like way.

A species of Botrytis.

Botrytis

A species of Botrytis.

These are the seeds of the Box Elder, Acer negundo, (Keeler, 1915).

Box Elder Seeds

These are the seeds of the Box Elder, Acer negundo, (Keeler, 1915).

"Bragantia Blumei. 1. a section of its wood; 2. one of its flowers; 3. a seed; 4. the same divided perpendicularly; 5. anthers and stigma of Asarum." -Lindley, 1853

Bragantia

"Bragantia Blumei. 1. a section of its wood; 2. one of its flowers; 3. a seed; 4. the same divided perpendicularly;…

This shows the unfolding leaves of the Beech branch, (Keeler, 1915).

Beech Branch

This shows the unfolding leaves of the Beech branch, (Keeler, 1915).

This shows the winter branch of Cottonwood, Populus deltoides, (Keeler, 1915).

Cottonwood Branch

This shows the winter branch of Cottonwood, Populus deltoides, (Keeler, 1915).

This shows the branch of Hop Hornbeam, Ostrya virginiana, showing the staminate aments as they appear in winter,(Keeler, 1915).

Hop Hornbeam Branch

This shows the branch of Hop Hornbeam, Ostrya virginiana, showing the staminate aments as they appear…

This is the branch of Red Birch, Betula nigra, showing the staminate aments as they appear in winter, (Keeler, 1915).

Red Birch

This is the branch of Red Birch, Betula nigra, showing the staminate aments as they appear in winter,…

This shows the four staminate and one pistillate ament of Sweet Birch, Betula lenta, (Keeler, 1915).

Sweet Birch Branch

This shows the four staminate and one pistillate ament of Sweet Birch, Betula lenta, (Keeler, 1915).

Bryopsis plumosa; apex of a stem with its branchlets; all the extension of one cell.

Bryopsis Plumosa

Bryopsis plumosa; apex of a stem with its branchlets; all the extension of one cell.

Orthotropous ovule of Buckwheat: <em>c</em>, hilum and chalaza; <em>f</em>, orifice.

Buckwheat

Orthotropous ovule of Buckwheat: c, hilum and chalaza; f, orifice.

Akene of a Buttercup.

Buttercup

Akene of a Buttercup.

Akene of a Buttercup, divided lengthwise, to show the contained seed.

Akene of a Buttercup

Akene of a Buttercup, divided lengthwise, to show the contained seed.

"Pinguicula vulgaris. 1. calyx, &c. 2. stamen; 3. pistil; 4. longitudinal section of it; 5. half a fruit; 6. seeds, natural size; 7. embryo very much magnified." -Lindley, 1853

Common Butterwort

"Pinguicula vulgaris. 1. calyx, &c. 2. stamen; 3. pistil; 4. longitudinal section of it; 5. half a fruit;…

Some wood-cells from Buttonwood, Platanus, a whole cell and lower end of another on the left; a cell cut half away lengthwise, and half of another on the right; some pores or pits (a) seen on the left; while <em>b b</em> mark sections through these on the cut surface. When lving and young the protoplasm extends into these and by minuter perforations connects across them. In age the pits become open passages, facilitating the passage of sap and air.

Buttonwood

Some wood-cells from Buttonwood, Platanus, a whole cell and lower end of another on the left; a cell…

"Byrsanthus Brownii. 1. diagram of the flower; 2. section of a flower; 3. section across the ovary; 4. section of a seed." -Lindley, 1853

Byrsanthus

"Byrsanthus Brownii. 1. diagram of the flower; 2. section of a flower; 3. section across the ovary;…

A leaf of the Calla Lily.

Calla Lily

A leaf of the Calla Lily.

Embryo of Calycanthus; upper part cut away, to show the convolute cotyledons.

Embryo of Calycanthus

Embryo of Calycanthus; upper part cut away, to show the convolute cotyledons.

"Cardamom. a, cross section of fruit; b, fruit; c, flower; d, seeds." -Foster, 1921

Cardamom

"Cardamom. a, cross section of fruit; b, fruit; c, flower; d, seeds." -Foster, 1921

Of the Parsley family (Umbelliferae), the wild carrot (Daucus Carota).

Wild Carrot

Of the Parsley family (Umbelliferae), the wild carrot (Daucus Carota).

One of Catalpa, the kernel cut to show the embryo.

Catalpa

One of Catalpa, the kernel cut to show the embryo.

Branch of a Chara

Chara

Branch of a Chara

Outlines of a portion of the stem in section, showing the central cell and the outer or cortical cells.

Chara

Outlines of a portion of the stem in section, showing the central cell and the outer or cortical cells.

An inrolled small leaf, such as in double-flowered Cherry blossoms is often seen to occupy the place of a pistil.

Cherry Blossom

An inrolled small leaf, such as in double-flowered Cherry blossoms is often seen to occupy the place…

Campylotropous ovule of a Chickweed: <em>c</em>, hilum and chalaza: <em>f</em>, orifice.

Chickweed

Campylotropous ovule of a Chickweed: c, hilum and chalaza: f, orifice.

Seed of a Chickweed, campylotropous.

Seed of a Chickweed

Seed of a Chickweed, campylotropous.

Cladonia coccinea; the fructification is in the scarlet knobs, which surround the cups.

Cladonia

Cladonia coccinea; the fructification is in the scarlet knobs, which surround the cups.

Leaf of Red Clover: <em>at</em>, stipules, adhering to the base of <em>p</em>, the petiole; <em>b</em>, blade of three leaflets.

Red Clover

Leaf of Red Clover: at, stipules, adhering to the base of p, the petiole; b,…

"Erythroxylon. 1. a flower; 2. one of the petals; 3. the pistil with 3 capitate stigmas; 4. a drupe; 5. the embryo." -Lindley, 1853

Coca

"Erythroxylon. 1. a flower; 2. one of the petals; 3. the pistil with 3 capitate stigmas; 4. a drupe;…

These are the pistillate and staminate flowers of Kentucky coffee-tree, (Keeler, 1915).

Coffee-Tree Fowers

These are the pistillate and staminate flowers of Kentucky coffee-tree, (Keeler, 1915).

Each scale of the pine cone is a whole pistillate flower. (Gray, 1858).

Cone

Each scale of the pine cone is a whole pistillate flower. (Gray, 1858).

Seeds falling from a cone

Cone Seeds

Seeds falling from a cone

A slice of the head of flowers of a Coreopsis, with one tubular perfect flower (a) left standing on the receptacle, with its bractlet or chaff (b), one ligulate and meutral ray-flower (cc), and part of another; (dd), section or bracts or leaves of the involucre.

Coreopsis

A slice of the head of flowers of a Coreopsis, with one tubular perfect flower (a) left standing on…

Five syngenesious stamens of a Coreopsis, with the tube laid open and displayed.

Coreopsis

Five syngenesious stamens of a Coreopsis, with the tube laid open and displayed.

"1. Coriaria napalensis; 2. flower of Coriaria myrtifolia without its calyx; 3. its pistil; 4. a perpendicular section of it." -Lindley, 1853

Coriaria

"1. Coriaria napalensis; 2. flower of Coriaria myrtifolia without its calyx; 3. its pistil; 4. a perpendicular…

These are the fruit, or samara, of Cork Elm, Ulmus racemosa, (Keeler, 1915).

Cork Elm Fruit

These are the fruit, or samara, of Cork Elm, Ulmus racemosa, (Keeler, 1915).

Front view of a papilionaceous corolla.

Corolla

Front view of a papilionaceous corolla.

View of a papilionaceous corolla, displaying <em>s</em>, Standard or Vexilluml <em>w</em>, wings, or Alae; <em>k</em>, Keel, or Carina.

Corolla

View of a papilionaceous corolla, displaying s, Standard or Vexilluml w, wings, or…

A corymb

Corymb

A corymb

This shows the staminate aments of the cottonwood, Populus deltoides (Keeler, 1915).

Cottonwood Flowers

This shows the staminate aments of the cottonwood, Populus deltoides (Keeler, 1915).

This shows the pistillate aments of the cottonwood, Populus deltoides (Keeler, 1915).

Cottonwood Flowers

This shows the pistillate aments of the cottonwood, Populus deltoides (Keeler, 1915).

Leafy shoot and berry (cut across) of the larger Cranberry, Vaccinium macrocarpon.

Cranberry

Leafy shoot and berry (cut across) of the larger Cranberry, Vaccinium macrocarpon.

Flower of a Crassula, diagram or ground-plan of same.

Crassula

Flower of a Crassula, diagram or ground-plan of same.

Corm of a Crocus, the investing sheaths or dead leaf-bases stripped off. The faint cross-lines represent the scars, where the leaves were attached, i. e. the nodes: the spaces between are the internodes. The exhausted corm of the previous year is underneath; forming ones for next year on the summit and sides.

Crocus

Corm of a Crocus, the investing sheaths or dead leaf-bases stripped off. The faint cross-lines represent…

"Erucastrum Canariense. 1. a flower. 2. the stamens; 3. the siliqua, with the valve separating from the replum; 4. a transverse section of a seed; 5. a perfect seed." -Lindley, 1853

Crucifer

"Erucastrum Canariense. 1. a flower. 2. the stamens; 3. the siliqua, with the valve separating from…

The Squirting or Exploding Cucumber (Ecballium elaterium) is a cucumber plant named for squirting a stream of liquid containing its seeds.

Squirting Cucumber

The Squirting or Exploding Cucumber (Ecballium elaterium) is a cucumber plant named for squirting a…

Fascicled fusiform roots of a Dahlia.

Dahlia

Fascicled fusiform roots of a Dahlia.

Milk Vessels of Dandelion, with cells of the common cellular tissue.

Dandelion

Milk Vessels of Dandelion, with cells of the common cellular tissue.

Milk Vessels of Dandelion, with cells of the common cellular tissue.

Dandelion

Milk Vessels of Dandelion, with cells of the common cellular tissue.

Of the Dandelion, its pappus raised on a long beak.

Dandelion

Of the Dandelion, its pappus raised on a long beak.

Flower of Datura Stramonium; gamosepalous and gamopetalous.

Datura Stramonium

Flower of Datura Stramonium; gamosepalous and gamopetalous.

Upper part of corolla of Datura Stramonium in the bud; and below a section showing the convolution of the plaits.

Datura Stramonium

Upper part of corolla of Datura Stramonium in the bud; and below a section showing the convolution of…

A piece of the rose-red Delesseria Lepreiurei

Delesseria Lepreiurei

A piece of the rose-red Delesseria Lepreiurei

A piece of the rose-red Delesseria Lepreiurei, showing that it is composed of a layer of cells.

Delesseria Lepreiurei

A piece of the rose-red Delesseria Lepreiurei, showing that it is composed of a layer of cells.

A piece of the rose-red Delesseria Lepreiurei, showing the cells are gelatinous and thick-walled.

Delesseria Lepreiurei

A piece of the rose-red Delesseria Lepreiurei, showing the cells are gelatinous and thick-walled.

Closterium acutum, a common Desmid. It is a single firm-walled cell, filled with green protoplasmic matter.

Desmid

Closterium acutum, a common Desmid. It is a single firm-walled cell, filled with green protoplasmic…

View of three stages of the conjugation

Desmid

View of three stages of the conjugation