A type of flower.

Anemone

A type of flower.

The flower of the apple tree.

Apple (flower)

The flower of the apple tree.

A type of flower.

Buttercup

A type of flower.

A type of flower.

Campanula

A type of flower.

Modes of cell reproduction. A, B, and C, stages in the reproduction of the Infusorian, Colpoda, by the breaking up of the protoplasm to form numerous cells. A, encysted stage; B, protoplasm escaping, spores partly formed; C, spores completely separated; D, budding in Chlamydomyxa, a lowly Rhizopod. b, bud; cw., cell wall; m, mother cell; n, nuclear matter; s, spores.

Cell Reproduction

Modes of cell reproduction. A, B, and C, stages in the reproduction of the Infusorian, Colpoda, by the…

A type of flower.

Chenopodium

A type of flower.

An illustration of a chiton's excretory and reproductive organs. O, Ovary; P, Pericardium; N, Nephridium; r, rectum; and Br, Ctenidia.

Chiton Excretory and Reproductive Organs

An illustration of a chiton's excretory and reproductive organs. O, Ovary; P, Pericardium; N, Nephridium;…

An illustration of a chiton's excretory and reproductive organs. O, Ovary; P, Pericardium; N, Nephridium; r, rectum; Cl, Cloacal or pallial chamber of Neomaniae and Chaetoerma; and Br, Ctenidia.

Chiton Excretory and Reproductive Organs

An illustration of a chiton's excretory and reproductive organs. O, Ovary; P, Pericardium; N, Nephridium;…

An illustration of a chiton's excretory and reproductive organs. O, Ovary; P, Pericardium; N, Nephridium; r, rectum; and Cl, Cloacal or pallial chamber of Neomaniae and Chaetoerma.

Chiton Excretory and Reproductive Organs

An illustration of a chiton's excretory and reproductive organs. O, Ovary; P, Pericardium; N, Nephridium;…

An illustration of a chiton's excretory and reproductive organs. O, Ovary; P, Pericardium; N, Nephridium; r, rectum; and Cl, Cloacal or pallial chamber of Neomaniae and Chaetoerma; Br, Ctenidia; g, External aperture of the gential duct of Chiton; and u, External aperture of nephridium.

Chiton Excretory and Reproductive Organs

An illustration of a chiton's excretory and reproductive organs. O, Ovary; P, Pericardium; N, Nephridium;…

A type of flower.

Convolvulus

A type of flower.

This illustration shows a cross-section of an ovary of a flower.

Cross-Section of Flower Ovary

This illustration shows a cross-section of an ovary of a flower.

A type of flower.

Deadnettle

A type of flower.

Stamens of a flower situated above a receptacle holding the ovary.

Epigynous Stamens

Stamens of a flower situated above a receptacle holding the ovary.

An illustration of the reproduction of an individual Euplotes Harpa by simple division.

Reproduction of an Individual Euplotes Harpa

An illustration of the reproduction of an individual Euplotes Harpa by simple division.

An illustration of the reproduction of an individual Euplotes Harpa by simple division.

Reproduction of an Individual Euplotes Harpa

An illustration of the reproduction of an individual Euplotes Harpa by simple division.

This illustration shows the fertilization of a flower, by means of a pollen tube entering a micropyle, a small hole in the surface of the ovule.

Fertilization (Flower)

This illustration shows the fertilization of a flower, by means of a pollen tube entering a micropyle,…

This illustration shows fertilization of a flower, by means of pollen falling from stamens (male organ) onto a pistil (female organ).

Fertilization (Flower)

This illustration shows fertilization of a flower, by means of pollen falling from stamens (male organ)…

A European plant which grows in stagnant or nearly stagnant water. It has long, sword-shaped leaves, and bears an umbel of large reddish flowers at the end of its long stalk. This illustration shows 1) a cross-section of a flower, and 2) the fruit of the flowering rush.

Flowering Rush

A European plant which grows in stagnant or nearly stagnant water. It has long, sword-shaped leaves,…

A form of a type of flower.

Form of Calyx in Compositae

A form of a type of flower.

A form of a type of flower.

Form of Calyx in Compositae

A form of a type of flower.

A form of a type of flower.

Form of Calyx in Compositae

A form of a type of flower.

This illustration shows a form of a stamen, the part of a flower that holds pollen for reproduction.

Form of Stamen

This illustration shows a form of a stamen, the part of a flower that holds pollen for reproduction.

This illustration shows a form of a stamen, the part of a flower that holds pollen for reproduction.

Form of Stamen

This illustration shows a form of a stamen, the part of a flower that holds pollen for reproduction.

This illustration shows a form of a stamen, the part of a flower that holds pollen for reproduction.

Form of Stamen

This illustration shows a form of a stamen, the part of a flower that holds pollen for reproduction.

A type of flower.

Frog Bit

A type of flower.

"When the ovary is composed of several carpels, the carpels are arranged with the midrib placed outwardly, and the margins turned inward toward the center, as seen in the transverse section of the Hibiscus, which is composed of five carpels, with their margins meeting in the center, forming a central placenta, to which the seeds are attached."

Section of Hibiscus

"When the ovary is composed of several carpels, the carpels are arranged with the midrib placed outwardly,…

A type of stamen that is positioned underneath the pistil in a flower.

Hypogynous Stamens

A type of stamen that is positioned underneath the pistil in a flower.

A type of flower.

Laburnum

A type of flower.

A type of flower.

Larkspur

A type of flower.

A type of flower.

Lily of the Valley

A type of flower.

The female reproductive organ of a Lily.

Lily Pistil

The female reproductive organ of a Lily.

A type of flower.

Madonna Lily

A type of flower.

A type of marigold flower.

Marsh Marigold

A type of marigold flower.

Ovary of a prunella plant.

Prunella ovary

Ovary of a prunella plant.

The female reproductive organ, or pistil, of a pea plant.

Pea Pistil

The female reproductive organ, or pistil, of a pea plant.

Stamens of a flower that surround the rim of a cup or tube that surrounds the ovary, but is not attached to it.

Perigynous Stamens

Stamens of a flower that surround the rim of a cup or tube that surrounds the ovary, but is not attached…

This is a Buttercup petal, with glands.

Petal of Buttercup, With Glands

This is a Buttercup petal, with glands.

A type of flower.

Pimpernel

A type of flower.

Pistil and stamens of a shepherd's purse.

Pistil and stamens of shepherd's purse

Pistil and stamens of a shepherd's purse.

This illustration shows a poppy flower with its petals removed.

Poppy, Petals Removed

This illustration shows a poppy flower with its petals removed.

A type of flower.

Primrose

A type of flower.

A type of flower.

Snapdragon

A type of flower.

A spore.

Spore

A spore.

"Two secondary spores joined"—Finley, 1917

Joined spores

"Two secondary spores joined"—Finley, 1917

Pistil of a Star of Bethlehem.

Star of Bethlehem, pistil of

Pistil of a Star of Bethlehem.

Stamen of a Star of Bethlehem.

Stamen of Star of Bethlehem

Stamen of a Star of Bethlehem.

A type of flower.

Sweet Pea

A type of flower.

A type of flower.

Toad Flax

A type of flower.

The female reproductive organ, pistil, of a Tulip.

Tulip Pistil

The female reproductive organ, pistil, of a Tulip.

A type of flower.

Wallflower

A type of flower.