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"Ochranthe arguta. 1. grain of pollen; 2. perpendicular section of its pistil." -Lindley, 1853

Ochranthe

"Ochranthe arguta. 1. grain of pollen; 2. perpendicular section of its pistil." -Lindley, 1853

A branch of an Ocotea catesbyana tree. They are commonly found throughout tropical climates, including Central and South America, and Madagascar.

Branch of Ocotea Catesbyana

A branch of an Ocotea catesbyana tree. They are commonly found throughout tropical climates, including…

A tubular sheath present on the stem just above the base of the leaves of docks and smartweeds. It is formed of the fused stipules.

Ocrea

A tubular sheath present on the stem just above the base of the leaves of docks and smartweeds. It is…

A pink flower that typically blooms in the Spring. The plant has been used for centuries as a medicinal herb, and the leaves are commonly eaten by caterpillars. They reach up to 1 foot in height.

Pulmonaris Officinalis

A pink flower that typically blooms in the Spring. The plant has been used for centuries as a medicinal…

"The castor oil plant belongs to an order whose affinities have not yet been accurately limited by botanists; but it is supposed to comprise at least one thousand five hundred species." -Lupton

The Castor Oil Plant

"The castor oil plant belongs to an order whose affinities have not yet been accurately limited by botanists;…

A flowering plant with edible green seed pods.

Okra

A flowering plant with edible green seed pods.

"Flowering Branch of Oleaster (Elaeagnus angustifolia). a, fruit; b, section of same." -Whitney, 1911

Oleaster

"Flowering Branch of Oleaster (Elaeagnus angustifolia). a, fruit; b, section of same." -Whitney, 1911

Also known as Juniperus monosperma. A species of Juniper native to western North America.

Branch of One-Seed Juniper

Also known as Juniperus monosperma. A species of Juniper native to western North America.

A dry onion that has a pure white skin and a sweet, mild white flesh.

White Onion

A dry onion that has a pure white skin and a sweet, mild white flesh.

Also known as Populus balsamifera. The branch of an Ontario Balsam Poplar tree, native to northern United States.

Branch of Ontario Balsam Poplar

Also known as Populus balsamifera. The branch of an Ontario Balsam Poplar tree, native to northern United…

Coming off opposite each other at the same level on the axis.

Opposite

Coming off opposite each other at the same level on the axis.

Hypogenous disk in Orange.

Orange

Hypogenous disk in Orange.

The Florida state flower, the orange blossom.

Orange Blossom

The Florida state flower, the orange blossom.

Circular or round.

Orbicular

Circular or round.

"Section of capsule of Ophrys apifera" (Bee Orchid). -Lindley, 1853

Bee Orchid Capsule

"Section of capsule of Ophrys apifera" (Bee Orchid). -Lindley, 1853

"Column of Orchis mascula" (Early Purple Orchid). -Lindley, 1853

Early Purple Orchid Column

"Column of Orchis mascula" (Early Purple Orchid). -Lindley, 1853

"Apostasia odorata; 1. a flower; 2. the stamens and style; 3. a cross section of the ovary; 4. a seed." -Lindley, 1853

Apostasia Orchid

"Apostasia odorata; 1. a flower; 2. the stamens and style; 3. a cross section of the ovary; 4. a seed."…

The flower of Coryanthes speciosa, a species of Bucket Orchids.

Bucket Orchid

The flower of Coryanthes speciosa, a species of Bucket Orchids.

"Megaclinium Bufo; 1. a portion of a spike magnified; 2. flowers in various positions, more magnified." -Lindley, 1853

Bulbophyllum bufo

"Megaclinium Bufo; 1. a portion of a spike magnified; 2. flowers in various positions, more magnified."…

The flower of a species of Caladenia orchids.

Caladenia Orchid

The flower of a species of Caladenia orchids.

The flower of the Angraecum eburneum species of Comet Orchids.

Comet Orchid

The flower of the Angraecum eburneum species of Comet Orchids.

The flower of a the Small Spathe Disa (Disa spathulata), a species of orchid.

Disa Orchid

The flower of a the Small Spathe Disa (Disa spathulata), a species of orchid.

The flower of the Diuris or Donkey Orchid.

Donkey Orchid

The flower of the Diuris or Donkey Orchid.

The flower of the orchid, Drymoda picta.

Drymoda picta

The flower of the orchid, Drymoda picta.

"Hetaeria pygmaea; 2. a flower; 3. the fertile stamen and two lateral sterile ones; 4. a cross section of the ovary." -Lindley, 1853

Hetaeria Orchid

"Hetaeria pygmaea; 2. a flower; 3. the fertile stamen and two lateral sterile ones; 4. a cross section…

Herminium monorchis or the Musk Orchid is a flowering plant of the Orchid family.

Musk Orchid

Herminium monorchis or the Musk Orchid is a flowering plant of the Orchid family.

The flower of the orchid, Oberonia griffithiana

Oberonia Griffithiana

The flower of the orchid, Oberonia griffithiana

"2. Cycnoches ventricosum; 4 and 5. C. Egertonianum (Swan Orchid); the others intermediate forms." -Lindley, 1853

Swan Orchid

"2. Cycnoches ventricosum; 4 and 5. C. Egertonianum (Swan Orchid); the others intermediate forms." -Lindley,…

"Lip of Warrea bidentata" (Warrea lindeniana). -Lindley, 1853

Warrea Orchid

"Lip of Warrea bidentata" (Warrea lindeniana). -Lindley, 1853

Pollinium of an Orchis (Habenaria), with its stalks attached to a sticky gland.

Polllinia of a Orchis

Pollinium of an Orchis (Habenaria), with its stalks attached to a sticky gland.

Plants smaller; not wite-powdery above; leaves shed water easily; flowers along fleshy spike enclosed in a leafy sheath.

Orontium

Plants smaller; not wite-powdery above; leaves shed water easily; flowers along fleshy spike enclosed…

An apparatus, used to demonstrate how root-hairs are used to take in soil-water

Osmosis Apparatus

An apparatus, used to demonstrate how root-hairs are used to take in soil-water

Spores borne on terminal modified leaves; divisions of the leaf larger, more than 2 cm long.

Osmunda

Spores borne on terminal modified leaves; divisions of the leaf larger, more than 2 cm long.

The branch of an Ostrya knowltoni.

Branch of Ostrya Knowltoni

The branch of an Ostrya knowltoni.

The basal portion of the pistil in which the seeds or ovules are bourne.

Ovary

The basal portion of the pistil in which the seeds or ovules are bourne.

Ovary of a prunella plant.

Prunella ovary

Ovary of a prunella plant.

Having an outline like that of an egg, with the broadest part downward.

Ovate

Having an outline like that of an egg, with the broadest part downward.

Also known as Quercus lyrata. The branch of an Overcup Oak tree, native to the wetlands of the United States.

Branch of Overcup Oak

Also known as Quercus lyrata. The branch of an Overcup Oak tree, native to the wetlands of the United…

A section of an ovule. An ovule is a structure found in seed plants that develops into a seed after fertilization.

Ovule

A section of an ovule. An ovule is a structure found in seed plants that develops into a seed after…

A fern with short, ovate fronds.

Polypodium Lycopodioides Owariense

A fern with short, ovate fronds.

Fruit flattened dorsally; fruit prominently winged.

Oxypolis

Fruit flattened dorsally; fruit prominently winged.

Also known as Abies amabilis. A species of fir native to the Pacific Northwest of North America.

Pine Cone of Pacific Silver Fir

Also known as Abies amabilis. A species of fir native to the Pacific Northwest of North America.

Also known as Taxus brevifolia. A conifer native to the Pacific Northwest of North America.

Branch of Pacific Yew

Also known as Taxus brevifolia. A conifer native to the Pacific Northwest of North America.

"Sagus Rumphii. 1. a flower; 2. the same opened; 3. a section of an ovary; 4. a section of a seed of Sagus filaris; 5. fruit and remains of spadix." -Lindley, 1853

Palm

"Sagus Rumphii. 1. a flower; 2. the same opened; 3. a section of an ovary; 4. a section of a seed of…

"Inflorescence of Chamaerops humilis, in its spathe; 2. a portion of the same, with the fruit ripening; 3. a male flower; 4. a female flower; 5. a ripe fruit; 6. a section of another variety, showing the seed; 7. a seed with a portion of the surface cut away, to display the embryo." -Lindley, 1853

Fan Palm

"Inflorescence of Chamaerops humilis, in its spathe; 2. a portion of the same, with the fruit ripening;…

The Sago Palm (Metroxylon sagu) is a tree in the Arecaceae family of palms.

Sago Palm

The Sago Palm (Metroxylon sagu) is a tree in the Arecaceae family of palms.

"Palm Trees. 1. Corypha Gebanga; 2. Nipa fruiticans." -Lindley, 1853

Gebang and Nipa Palm Trees

"Palm Trees. 1. Corypha Gebanga; 2. Nipa fruiticans." -Lindley, 1853

"Dorystigma. 1. a corolla laid open; 2. calyx and pistil; 3. seed; 4. section of ditto." -Lindley, 1853

Pandanus

"Dorystigma. 1. a corolla laid open; 2. calyx and pistil; 3. seed; 4. section of ditto." -Lindley, 1853

An irregularly compund flower cluster with stalked flowers.

Panicle

An irregularly compund flower cluster with stalked flowers.

Spikelets not inflated as base.

Panicum

Spikelets not inflated as base.

The papaya or fruit from the Carica Papaya plant.

Papaya

The papaya or fruit from the Carica Papaya plant.

Diagram of papilionaceous flower, with bract below; axis of inflorescence above.

Papilionaceous Flower

Diagram of papilionaceous flower, with bract below; axis of inflorescence above.

"Paris quadrifolia. 1. A transverse section of an ovary; 2. perpendicular section of the ripe fruit; 3. longitudinal section of a seed; 4. an anther." -Lindley, 1853

Herb Paris

"Paris quadrifolia. 1. A transverse section of an ovary; 2. perpendicular section of the ripe fruit;…

A plant cultivated as a herb, spice, and a vegetable.

Fine Curled Parsley

A plant cultivated as a herb, spice, and a vegetable.

Also known as Quercus engelmannii. The branch of a Pasadena Oak tree, native to California.

Branch of Pasadena Oak

Also known as Quercus engelmannii. The branch of a Pasadena Oak tree, native to California.

The branch of a Pasania densiflora, a species of beech tree.

Branch of Pasania Densiflora

The branch of a Pasania densiflora, a species of beech tree.

Leaves not flat-floating; inflourescences large and conspicuous.

Paspalum

Leaves not flat-floating; inflourescences large and conspicuous.

"Passiflora; 1. section of a flower; 2. of its ripe fruit." -Lindley, 1853

Passion Flower

"Passiflora; 1. section of a flower; 2. of its ripe fruit." -Lindley, 1853

A small Passion-flower, with crown of slender threads.

Passion-flower

A small Passion-flower, with crown of slender threads.

Cross section of the anatomy of a pea blossom.

Pea blossom

Cross section of the anatomy of a pea blossom.