Side view of a pea blossom.

Pea blossom

Side view of a pea blossom.

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

Pea Pistil

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

An illustration of a pea sprout including the roots.

Pea Sprout

An illustration of a pea sprout including the roots.

Diadelphous stamens of a pea-blossom.

Pea-blossom

Diadelphous stamens of a pea-blossom.

"Fruit of Peach (Prunus persica). En, endocarp; Ep, epicarp; Mes, mesocarp." -Whitney, 1911

Peach

"Fruit of Peach (Prunus persica). En, endocarp; Ep, epicarp; Mes, mesocarp." -Whitney, 1911

Also known as Salix amygdaloides. The branch of a Peachleaf Willow tree, native to southern Canada and northern United States.

Branch of Peachleaf Willow

Also known as Salix amygdaloides. The branch of a Peachleaf Willow tree, native to southern Canada and…

"1. branch of Pyrus communis; 2. its flower divided vertically; 3. a cross section of its fruit." -Lindley, 1853

European Pear

"1. branch of Pyrus communis; 2. its flower divided vertically; 3. a cross section of its fruit." -Lindley,…

A large pea plant.

Alaska peas

A large pea plant.

Also known as Hicoria pecan. The branch of a standard pecan tree.

Branch of Pecan Tree

Also known as Hicoria pecan. The branch of a standard pecan tree.

A stalk of a single flower.

Pedicel

A stalk of a single flower.

Of the Figwort family (Scrophulariaceae), Pedicularis lanceolata.

Pedicularis lanceolata

Of the Figwort family (Scrophulariaceae), Pedicularis lanceolata.

Leaves usually with sharp lobes; flowers individually inconspicuous, on a fleshy axis snclosed in a leaf-like sheath.

Peltandra

Leaves usually with sharp lobes; flowers individually inconspicuous, on a fleshy axis snclosed in a…

Petiole attached notat margin of leaf but in the middle of the lower surface.

Peltate

Petiole attached notat margin of leaf but in the middle of the lower surface.

"11. seed of Penaea mucronata; 12. same with half the testa removed." -Lindley, 1853

Penaea Seeds

"11. seed of Penaea mucronata; 12. same with half the testa removed." -Lindley, 1853

"Celastrus paniculatus. 1. a flower; 2. a perpendicular section of the ovary; 3. a cross section of the ovary; 4. a vertical section of a seed; 5. a cross section of it." -Lindley, 1853

Peng

"Celastrus paniculatus. 1. a flower; 2. a perpendicular section of the ovary; 3. a cross section of…

Flowers greenish, 5-petaled.

Penthorum

Flowers greenish, 5-petaled.

Corolla, laid open, and stamens of Pentstemon grandiflorus, with a sterile filament in the place of the fifth stamen, and representing it.

Pentstemon Grandiflorus

Corolla, laid open, and stamens of Pentstemon grandiflorus, with a sterile filament in the place of…

"The ovary of Paeonia Moutan, surrounded by its broken disk." -Lindley, 1853

Peony

"The ovary of Paeonia Moutan, surrounded by its broken disk." -Lindley, 1853

"Serronia Jaborandi. 1. a cluster of flowers magnified; 2. a ripe fruit; 3. a vertical section of the same, showing the seed and position of the embyo." -Lindley, 1853

Pepper

"Serronia Jaborandi. 1. a cluster of flowers magnified; 2. a ripe fruit; 3. a vertical section of the…

A variety of pepper.

Cardinal Pepper

A variety of pepper.

A variety of pepper with a mild fruit and pleasant taste.

Ruby King Pepper

A variety of pepper with a mild fruit and pleasant taste.

"The mint family of plants, of which the most important species are peppermint, spearmint and penny-royal, all contain an aromatic essential oil, possessing medicinal qualities." -Lupton

Peppermint

"The mint family of plants, of which the most important species are peppermint, spearmint and penny-royal,…

"The upper part of Peppermint (Mentha piperita), with flowers. a, flower; b, calyx." -Century, 1889

Peppermint

"The upper part of Peppermint (Mentha piperita), with flowers. a, flower; b, calyx." -Century, 1889

The calyx and corolla taken together.

Perianth

The calyx and corolla taken together.

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…

"Vinca minor. 1. corolla opened; 2. style and stigma; 3. perpendicular section of the double ovary; 4. section of a seed." -Lindley, 1853

lesser Periwinkle

"Vinca minor. 1. corolla opened; 2. style and stigma; 3. perpendicular section of the double ovary;…

Leaves, at least the younger onces, densely hairy or wooly beneath.

Persea

Leaves, at least the younger onces, densely hairy or wooly beneath.

The branch of a Persea borbonia tree.

Branch of Persea Borbonia

The branch of a Persea borbonia tree.

A member of the inner circle of flower parts; often colored and showy.

Petal

A member of the inner circle of flower parts; often colored and showy.

This is a Buttercup petal, with glands.

Petal of Buttercup, With Glands

This is a Buttercup petal, with glands.

The stalk of a leaf.

Petiole

The stalk of a leaf.

Petunia violacea or the violetflower petunia is a trumpet shaped flowering plant of the Solanaceae family.

Violetflower Petunia

Petunia violacea or the violetflower petunia is a trumpet shaped flowering plant of the Solanaceae family.

"Philesia buxifolia; 2. stigma of Lapageria rosea (Copihue); 3. its ovary cut across; 4. its ovule." -Lindley, 1853

Philesia and Copihue

"Philesia buxifolia; 2. stigma of Lapageria rosea (Copihue); 3. its ovary cut across; 4. its ovule."…

Corolla of a Phlox, with salver-shaped corolla.

Phlox

Corolla of a Phlox, with salver-shaped corolla.

"Flowers of Phlox drummondii showing salver-shaped corolla." -Whitney, 1911

Annual Phlox

"Flowers of Phlox drummondii showing salver-shaped corolla." -Whitney, 1911

A stout fern with brown scales. Fronds range between 1 foot and 3 feet in length, and 1 inch in width.

Polypodium Phyllitidis

A stout fern with brown scales. Fronds range between 1 foot and 3 feet in length, and 1 inch in width.

"Pysostemon lanceolatum. 1. a flower of the natural size; 2. the calyx, stamens, and ovary; 3. the ripe fruit, with one valve separating; 4, a seed; 5. the same cut vertically, to show the incurved embryo." -Lindley, 1853

Physostemon lanceolatum

"Pysostemon lanceolatum. 1. a flower of the natural size; 2. the calyx, stamens, and ovary; 3. the ripe…

Also known as Pontederia cordata. A blue plant with numerous spikes of blue flowers. It generally is found growing in shallow waters.

Pickerelweed

Also known as Pontederia cordata. A blue plant with numerous spikes of blue flowers. It generally is…

Also known as Hicoria glabra. The branch of a Pignut Hickory tree, native to the eastern United States.

Branch of Pignut Hickory

Also known as Hicoria glabra. The branch of a Pignut Hickory tree, native to the eastern United States.

A wide-creeping fern with squarrose scales. Fertile fronds are narrow and long, whereas the barren ones are oblong, between 1 inch and 3 inches long.

Polypodium Piloselloides

A wide-creeping fern with squarrose scales. Fertile fronds are narrow and long, whereas the barren ones…

A type of flower.

Pimpernel

A type of flower.

"Axillary and solitary flowers of pimpernel." -Bergen, 1896

Pimpernel Flowers

"Axillary and solitary flowers of pimpernel." -Bergen, 1896

"Brunonia sericea. 1. a complete flower; 2. the pistil; 3. a ripe fruit; 4. embryo." -Lindley, 1853

Blue Pincushion

"Brunonia sericea. 1. a complete flower; 2. the pistil; 3. a ripe fruit; 4. embryo." -Lindley, 1853

As it were of three grains or cells united; the lateral empty and light.

Pine Pollen

As it were of three grains or cells united; the lateral empty and light.

"Cone of Pinus muricata, showing the difference between the outer and inner sides of the same strobilius when the inner side is pressed against a branch. 1. A pair of leaves; 2. the end of the leaf magnified; 3, a seed, natural size." -Lindley, 1853

Bishop Pine

"Cone of Pinus muricata, showing the difference between the outer and inner sides of the same strobilius…

Also known as Pinus strobus. A pine cone of the Eastern White Pine.

Eastern White Pine

Also known as Pinus strobus. A pine cone of the Eastern White Pine.

Pinus sylvestris: the needles and cone of the Scots Pine tree.

Scots Pine

Pinus sylvestris: the needles and cone of the Scots Pine tree.

"Pineapple is a plant of the natural order Bromeliacæ. The flowers rise from the center of the plant, and are in a large conical spike, surmounted by spiny leaves called the crown. The conical spike of flowers ultimately becomes enlarged and juicy, constituting the pineapple, considered one of the finest of fruits. More than 50 varieties have been produced. The plant grows in the S. portion of the United States and in Hawaii. In the islands they sometimes reach the weight of 17 pounds, though the average weight is six. Since 1883 there have been large exports of this fruit from the various islands."—(Charles Leonard-Stuart, 1911)

Pineapple

"Pineapple is a plant of the natural order Bromeliacæ. The flowers rise from the center of the…

The fimbriate petals of the flower of the Clove Pink (Dianthus caryophyllus), from the Caryophyllaceae family of pinks or carnations.

Clove Pink

The fimbriate petals of the flower of the Clove Pink (Dianthus caryophyllus), from the Caryophyllaceae…

The pine cone of a Pinus divaricata.

Pine Cone of Pinus Divaricata

The pine cone of a Pinus divaricata.

Eriocaulon setaceum is a plant species in the Eriocaulaceae family of pipeworts.

Pipewort

Eriocaulon setaceum is a plant species in the Eriocaulaceae family of pipeworts.

The branch of a Pisonia longifolia tree.

Branch of Pisonia Longifolia

The branch of a Pisonia longifolia tree.

Leaves wide to the base, without petioles.

Pistia

Leaves wide to the base, without petioles.

The seed-bearing part of a flower.

Pistil

The seed-bearing part of a flower.

Compound 3-carpellary pistil of common St. John's-wort, cut across: the three styles separate.

Pistil of common St. John's-wort

Compound 3-carpellary pistil of common St. John's-wort, cut across: the three styles separate.

Pistil of a Sandwort, with vertical and transverse section of the ovary: free central placenta.

Pistil of Sandwort

Pistil of a Sandwort, with vertical and transverse section of the ovary: free central placenta.

Two simple carpals or pistil-leaves, united at the base only, cut across both above and below.

Pistil of Saxifrage

Two simple carpals or pistil-leaves, united at the base only, cut across both above and below.

The same of shrubby St. John's-wort; the three styles as well as ovaries here united into one.

Pistil of shrubby St. John's-wort

The same of shrubby St. John's-wort; the three styles as well as ovaries here united into one.

Compound 3-carpellary pistil of Tradescantia or Spiderwort; the three stigmas as well as styles and ovary completely coalescent into one.

Pistil of Spiderwort

Compound 3-carpellary pistil of Tradescantia or Spiderwort; the three stigmas as well as styles and…

Pistillate flower of Moonseed.

Pistillate Moonseed

Pistillate flower of Moonseed.