ClipArt ETC
A type of flower.

Primrose

A type of flower.

A section of the fruit of the primrose succisa, <em>scabious succisa</em>.

Section of primrose succisa fruit

A section of the fruit of the primrose succisa, scabious succisa.

Of Evening Primrose, with versatile anther.

Evening Primrose

Of Evening Primrose, with versatile anther.

Evening Primrose, the three lobes as large as the central body.

Evening Primrose

Evening Primrose, the three lobes as large as the central body.

"Ludwigia Jussiaeoides. 1. a flower with two sepals and all the petals cut off; 2. a calyx and inferior ovary; 3. a transverse section of the ovary; 4. a seed with the distinct raphe; 5. an embryo extracted." -Lindley. 1853

Wingleaf Primrosewillow

"Ludwigia Jussiaeoides. 1. a flower with two sepals and all the petals cut off; 2. a calyx and inferior…

Primula involucrata is a low-growing herb of the Primulaceae family.

Primula

Primula involucrata is a low-growing herb of the Primulaceae family.

Prismatic crystals from the bark of Hickory.

Prismatic crystals

Prismatic crystals from the bark of Hickory.

An illustration of a young prothallus: sp, spore; pr, prothallus. A prothallium, or prothallus is usually a pteridophyte, i.e. spore-bearing plant, (almost exclusively ferns) in gametophyte stage in the alternation of generations cycle.

Young Prothallus of Fern

An illustration of a young prothallus: sp, spore; pr, prothallus. A prothallium, or prothallus is usually…

An illustration of a microscopic view under the surface of a young prothallus: pr, prothallus; w, root-hairs; an, antheridia; ar, archegonia. A prothallium, or prothallus is usually a pteridophyte, i.e. spore-bearing plant, (almost exclusively ferns) in gametophyte stage in the alternation of generations cycle.

Young Prothallus of Fern

An illustration of a microscopic view under the surface of a young prothallus: pr, prothallus; w, root-hairs;…

Opened corolla of a prunella.

Prunella flower

Opened corolla of a prunella.

Young pumpkin seedling.

Pumpkin Seedling

Young pumpkin seedling.

Embryo of Pumpkin-seed, partly open.

Pumpkin-Seed

Embryo of Pumpkin-seed, partly open.

Pyxis of Purslane, the lid detaching.

Purslane

Pyxis of Purslane, the lid detaching.

Purslane-flower in section; calyx, petals, stamens adnate to lower half of ovary,-perigynous.

Purslane-flower

Purslane-flower in section; calyx, petals, stamens adnate to lower half of ovary,-perigynous.

This is a classification of a type of fruit.

Pyxidium

This is a classification of a type of fruit.

A pyxis is a pod which opens crosswise, the top separating as a lid, (Gray, 1858).

Pyxis

A pyxis is a pod which opens crosswise, the top separating as a lid, (Gray, 1858).

Leaf of the Quince: <em>b</em>, blade; <em>p</em>, petiole; <em>st</em>, stipules.

Quince

Leaf of the Quince: b, blade; p, petiole; st, stipules.

A raceme arrangement of flowers.

Raceme

A raceme arrangement of flowers.

From left to right: Various forms of radiatte-veined leaves.

Radiate-Veined

From left to right: Various forms of radiatte-veined leaves.

"Pangium edule. 1. a male flower; 2. an ovary with its sterile stamens; 3. a cross section of an ovary; 4. a perpendicular section of a seed." -Lindley, 1853

Raual

"Pangium edule. 1. a male flower; 2. an ovary with its sterile stamens; 3. a cross section of an ovary;…

"Grinnellia Americana. a, structure of the leaf; b, vertical section of a conceptacle, showing the chains of spores." -Whitney, 1911

Marine Red Algae

"Grinnellia Americana. a, structure of the leaf; b, vertical section of a conceptacle, showing the chains…

This is the staminate flower of Red Ash, Fraxinus pennsylvanica, (Keeler, 1915).

Red Ash Flower

This is the staminate flower of Red Ash, Fraxinus pennsylvanica, (Keeler, 1915).

This is the pistillate flower of Red Ash, Fraxinus pennsylvanica, (Keeler, 1915).

Red Ash Flower

This is the pistillate flower of Red Ash, Fraxinus pennsylvanica, (Keeler, 1915).

This is the fruit, or samara, of Red Ash, Fraxinus pennsylvanica, (Keeler, 1915).

Red Ash Fruit

This is the fruit, or samara, of Red Ash, Fraxinus pennsylvanica, (Keeler, 1915).

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

Red Birch Fruit

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

One of the pair of keys or winged fruits of Red Maple; the seed-bearing portion cut open to show the seed.

Red Maple

One of the pair of keys or winged fruits of Red Maple; the seed-bearing portion cut open to show the…

Opposite leaves, in Red Maple.

Red Maple

Opposite leaves, in Red Maple.

This shows the axillary buds on a twig of Red Maple, they are opposite like the leaves.

Red Maple Buds

This shows the axillary buds on a twig of Red Maple, they are opposite like the leaves.

Embryo taken out and partly opened.

Red Maple Embryo

Embryo taken out and partly opened.

Seed enlarged, and divided to show the crumpled embryo which fills it.

Red Maple Seed

Seed enlarged, and divided to show the crumpled embryo which fills it.

The seeds of the Red Maple, Acer rubrum, (Keeler, 1915).

Red Maple Seed

The seeds of the Red Maple, Acer rubrum, (Keeler, 1915).

A newly germinated seed of the Red Maple, seed leaves, and the roots.

Red Maple Seedling

A newly germinated seed of the Red Maple, seed leaves, and the roots.

A more advanced seedling of the Red Maple,.

Red Maple Seedling

A more advanced seedling of the Red Maple,.

Seedling with stem joints and pair of leaves.

Red Maple Seedling

Seedling with stem joints and pair of leaves.

These are the fruit of Red Mulberry, Morus rubra, (Keeler, 1915).

Red Mulberry Fruit

These are the fruit of Red Mulberry, Morus rubra, (Keeler, 1915).

This shows the cluster of two leaves of the Red Pine, Pinus resinosa, (Keeler, 1915).

Red Pine Needles

This shows the cluster of two leaves of the Red Pine, Pinus resinosa, (Keeler, 1915).

Red-Maple branch, with accessory buds placed side by side. The annular lines toward the base are scars of the bud-scales, and indicate the place of the winter-bud of the preceding year.

Red-Maple branch

Red-Maple branch, with accessory buds placed side by side. The annular lines toward the base are scars…

"Ribes rubrum. 1. perpendicular section of a flower; 2. cross section of the ovary; 3. seed; 4. a perpendicular section of it." -Lindley, 1853

Redcurrant

"Ribes rubrum. 1. perpendicular section of a flower; 2. cross section of the ovary; 3. seed; 4. a perpendicular…

"1. Locusta of Agrostis alba; 2. paleae and stamens, &c. of the same." -Lindley, 1853

Redtop Locusta

"1. Locusta of Agrostis alba; 2. paleae and stamens, &c. of the same." -Lindley, 1853

&quot;Bamboo-reed (Arundo donax). a, panicle; b, flowering scale, clothed with silky hairs; c, spikelet.&quot; -Whitney, 1911

Giant Reed

"Bamboo-reed (Arundo donax). a, panicle; b, flowering scale, clothed with silky hairs; c, spikelet."…

The fertile plant of the Resurrection Plant (Selaginella lepidophylla), a spikemoss which lives in deserts.

Resurrection Plant

The fertile plant of the Resurrection Plant (Selaginella lepidophylla), a spikemoss which lives in deserts.

This shows an revolute leaf.

Revolute Leaf Shape

This shows an revolute leaf.

"Rhabdia lycioides. 1. its flower; 2. the corolla opened; 3. a cross section of the ovary; 4. a perpendicular section of a seed." -Lindley, 1853

Rhabdia

"Rhabdia lycioides. 1. its flower; 2. the corolla opened; 3. a cross section of the ovary; 4. a perpendicular…

Rhaphides in a cell, from Arisaema, with small cells surrounding.

Rhaphides

Rhaphides in a cell, from Arisaema, with small cells surrounding.

"Rhododendron pumilum; 1. a calyx and pistil, with all stamens removed; 2. an anther; 3. a ripe capsule burst; 4. a vertical section of a seed." -Lindley, 1853

Rhododendron

"Rhododendron pumilum; 1. a calyx and pistil, with all stamens removed; 2. an anther; 3. a ripe capsule…

The Chilean Rhubarb (Gunnera tinctoria) is a large-leaved plant in the Gunneraceae family. It was also known as the synonym Gunnera scabra.

Chilean Rhubarb

The Chilean Rhubarb (Gunnera tinctoria) is a large-leaved plant in the Gunneraceae family. It was also…

Some cells from stalk of Rhubarb-plant, three containing chlorophyll; two (one torn across) with rhaphides.

Rhubarb-plant

Some cells from stalk of Rhubarb-plant, three containing chlorophyll; two (one torn across) with rhaphides.

Section of a grain of Rice, lengthwise, showing embryo outside the albumen, which forms the principal bulk.

Seed of Grain of Rice

Section of a grain of Rice, lengthwise, showing embryo outside the albumen, which forms the principal…

Seed of Ricinus or Castor-oil plant, with caruncle.

Ricinus

Seed of Ricinus or Castor-oil plant, with caruncle.

Ripe-fruit of a shepherd's purse.

Ripe-fruit of shepherd's purse

Ripe-fruit of a shepherd's purse.

"The female of Hydrostachys verruculosa. 1. the calyx; 2. the same opened to show the ovary; 3. a seed; 4. a vertical section of it." -Lindley, 1853

Riverweed

"The female of Hydrostachys verruculosa. 1. the calyx; 2. the same opened to show the ovary; 3. a seed;…

Section of seed of Rock Rose, Helianthemum Canadense; orthotropus, with curved embryo in the albumen.

Seed of Rock Rose

Section of seed of Rock Rose, Helianthemum Canadense; orthotropus, with curved embryo in the albumen.

Upper end of a Rockweed, Fucus vesiculosus.

Rockweed

Upper end of a Rockweed, Fucus vesiculosus.

Known as rockweed or bladder wrack, this species of seaweed is in the Fucaceae family of brown algae. "Fructifying Tip of a Frond of Rockweed (Fucus vesiculosus). a, a, air-bladders; b, b, conceptacles." -Whitney, 1911

Fructifying Tip of a Frond of Rockweed

Known as rockweed or bladder wrack, this species of seaweed is in the Fucaceae family of brown algae.…

Roots aid in support and nutrition for the plant.

Root

Roots aid in support and nutrition for the plant.

Roots aid in support and nutrition for the plant.

Root

Roots aid in support and nutrition for the plant.

Roots aid in support and nutrition for the plant. This is a beet root.

Root

Roots aid in support and nutrition for the plant. This is a beet root.

Roots aid in support and nutrition for the plant. This is a turnip root.

Root

Roots aid in support and nutrition for the plant. This is a turnip root.

Roots aid in support and nutrition for the plant. This is a runner root which sends down roots into the ground. The strawberry spreads this way.

Root

Roots aid in support and nutrition for the plant. This is a runner root which sends down roots into…

Roots aid in support and nutrition for the plant. This is a bulbous root from an onion.

Root

Roots aid in support and nutrition for the plant. This is a bulbous root from an onion.