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Optunia tuna is a variety of prickly pear. The flowers are reddish orange and bloom in July. There are bundles of yellow, unequal, spreading spines.

Optunia Tuna

Optunia tuna is a variety of prickly pear. The flowers are reddish orange and bloom in July. There are…

Opuntia basilaris is a variety of prickly pear with large, rose purple flowers. The flowers bloom in summer. The plant is covered with short, brown bristles.

Opuntia Basilaris

Opuntia basilaris is a variety of prickly pear with large, rose purple flowers. The flowers bloom in…

Opuntia boliviana is a variety of prickly pear. The joints of the plant are about two inches long and are pale green. The prickles are three to four inches long.

Opuntia Boliviana

Opuntia boliviana is a variety of prickly pear. The joints of the plant are about two inches long and…

Hypogenous disk in Orange.

Orange

Hypogenous disk in Orange.

"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.

Fly orchid (Ophrys insectifera) is a plant of the family Orchidaceae, a native of the British Isles and Europe favouring sites with alkaline soil. The name arises because it resembles a fly, being totally dependent on flies and bees for pollination. However this is fairly unsuccessful as they seldom visit the flower and it forms seed only infrequently. The plants use scent to attract male flies, which pollinate the flowers as they attempt to mate with the flower. The scent released by the flowers mimic female fly sexual pheromones.

Fly Orchid

Fly orchid (Ophrys insectifera) is a plant of the family Orchidaceae, a native of the British Isles…

Species: Habenaria spp. View of a single flower showing its strange, fringed lip.

Fringed Orchid

Species: Habenaria spp. View of a single flower showing its strange, fringed lip.

Species: Habenaria spp. View of a single flower showing its strange, fringed lip.

Fringed Orchid

Species: Habenaria spp. View of a single flower showing its strange, fringed lip.

Species: Habenaria spp. From a spike of the purple fringed orchis.

Fringed Orchid

Species: Habenaria spp. From a spike of the purple fringed orchis.

Species: Habenaria spp. From the ragged fringed orchis.

Fringed Orchid

Species: Habenaria spp. From the ragged fringed orchis.

"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

A diagram of the various parts of pollen of orchid. po- Pollinia; c- Caudicle; vd- Viscid Disk; vg- Viscid Glove; r- Rostellum; lr- Lip of Rostellum.

Pollen of Orchid

A diagram of the various parts of pollen of orchid. po- Pollinia; c- Caudicle; vd- Viscid Disk; vg-…

This is a common orchid having flowers that are uncommonly shaped.

Pot Orchid

This is a common orchid having flowers that are uncommonly shaped.

"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

Orchis purpurea flowers are green, purple, and spotted. The spikes are usually large and many flowered.

Orchis Purpurea

Orchis purpurea flowers are green, purple, and spotted. The spikes are usually large and many flowered.

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.

Pictured is a flowering branch and detached flower head of oreopanax andreanum. The flowers are globe shaped heads. The leaves are roundish and the trunk is simple or slightly branched.

Oreopanax Andreanum

Pictured is a flowering branch and detached flower head of oreopanax andreanum. The flowers are globe…

Pictured is a tip of a flowering branch and the leaf of oreopanax epremesnilianum. There are seven to nine leaflets.

Oreopanax Epremesnillianum

Pictured is a tip of a flowering branch and the leaf of oreopanax epremesnilianum. There are seven to…

The flowers of oreopanax peltatum are greenish white. The leaves are long stalked and five to seven nerved.

Oreopanax Peltatum

The flowers of oreopanax peltatum are greenish white. The leaves are long stalked and five to seven…

The common name of ornithogalum is Star of Bethlehem. The nutans variety has flowers that are white on the upper side and green on the back. The scape is eight to twelve inches long.

Ornithogalum Nutans

The common name of ornithogalum is Star of Bethlehem. The nutans variety has flowers that are white…

Star of Bethlehem is the common name of ornithogalum. The pyramidale variety has pure white flowers marked with a green stripe on the back. The flowers are arranged in clone shaped clusters. The flower clusters are six to eight inches long.

Habit and Detached Single Flower of Ornithogalum Pyramidale

Star of Bethlehem is the common name of ornithogalum. The pyramidale variety has pure white flowers…

Star of Bethlehem is the common name of ornithogalum. The thyrsoides variety has yellow flowers that bloom in June. There are five to six leaves.

Leaves and Inflorescence of Ornithogalum Thyrsoides

Star of Bethlehem is the common name of ornithogalum. The thyrsoides variety has yellow flowers that…

The common name of ornithogalum umbellatum is Star of Bethlehem. The flowers are satiny white on the inside and green striped with white on the outside. The flowers bloom in May.

Ornithogalum Umbellatum

The common name of ornithogalum umbellatum is Star of Bethlehem. The flowers are satiny white on the…

Osmanthus fragrans flowers are yellowish or almost white. The flowers bloom June to August. Pictured is the habit and a detached tip of the flowering branch.

Osmanthus Fragrans

Osmanthus fragrans flowers are yellowish or almost white. The flowers bloom June to August. Pictured…

Oswego Tea is the common name of monarda didyma. The flowers are bright scarlet and blue July to September. The leaflets are pale green tinged with red.

Flowering Branch of Oswego Tea

Oswego Tea is the common name of monarda didyma. The flowers are bright scarlet and blue July to September.…

Osyris alba flowers are white and bloom in July. The fruit is red and pea sized. The leaves alternate along the stem and are one inch long. The shrub grows between three and four feet tall.

Osyris Alba

Osyris alba flowers are white and bloom in July. The fruit is red and pea sized. The leaves alternate…

The common name of othonna is ragwort. The crassifolia variety has few flower heads that grow on the end of the stems. This variety is suitable for growing in a basket.

Othonna Crassifolia

The common name of othonna is ragwort. The crassifolia variety has few flower heads that grow on the…

Othonnopsis cheirifolia flowers are rich yellow and are about one and a half inches across. The leaves are thick and grayish.

Othonnopsis Cheirifolia

Othonnopsis cheirifolia flowers are rich yellow and are about one and a half inches across. The leaves…

Ourisia coccinea flowers are scarlet with cream colored anthers. The flowers are one and a half inches long and droop. The plant grows between six and twelve inches tall.

Ourisia Coccinea

Ourisia coccinea flowers are scarlet with cream colored anthers. The flowers are one and a half inches…

The ovary of Frostweed, cut across and magnified, (Gray, 1858).

Ovary

The ovary of Frostweed, cut across and magnified, (Gray, 1858).

Ovary of Sand-Spurrey, cut across (Gray, 1858).

Ovary

Ovary of Sand-Spurrey, cut across (Gray, 1858).

Oxalis is the largest genus in the wood sorrel family Oxalidaceae. Of the approximately 900 known species in the Oxalidaceae, 800 belong to Oxalis. Many of the species are known as Wood Sorrel or Woodsorrel. The genus occurs throughout most of the world, except for the polar areas; species diversity is particularly rich in tropical Brazil and Mexico and in South Africa.

Oxalis

Oxalis is the largest genus in the wood sorrel family Oxalidaceae. Of the approximately 900 known species…

Oxalis bowiei flowers are rose red and yellowish at the base inside. The flowers are large and bloom in August. The leaflets are three and obtuse.

Oxalis Bowiei

Oxalis bowiei flowers are rose red and yellowish at the base inside. The flowers are large and bloom…

Oxalis corniculata flowers are yellow and bloom spring to autumn. Pictured are the habit, detached bud, expanded flower, and capsule.

Oxalis Corniculata

Oxalis corniculata flowers are yellow and bloom spring to autumn. Pictured are the habit, detached bud,…

Oxalis crenata flowers are yellow striped with purple. The flowers bloom in September. The stem is erect and leafy.

Bulbs of Oxalis Crenata

Oxalis crenata flowers are yellow striped with purple. The flowers bloom in September. The stem is erect…

The bulbs of oxalis tetraphylla are large and scaly.

Bulbs of Oxalis Tetraphylla

The bulbs of oxalis tetraphylla are large and scaly.

Oxalis tetraphylla flowers are lurid red or purplish violet. The flowers are large and bloom in June.

Habit and Detached Flower of Oxalis Tetraphylla

Oxalis tetraphylla flowers are lurid red or purplish violet. The flowers are large and bloom in June.

Of the Composite family (Compositae), the oxeye (Heliopsis helianthoides).

Smooth Oxeye

Of the Composite family (Compositae), the oxeye (Heliopsis helianthoides).

Paeonia albiflora flowers usually have white or pink petals. The flowers are one and a half to two inches broad. The stem is two to three feet long.

Flowering Branch of Paeonia Albiflora

Paeonia albiflora flowers usually have white or pink petals. The flowers are one and a half to two inches…

Paeonia tenuifolia flore-pleno is a variety of peony. Flore-pleno is the double state. The tenuifolia variety has dark crimson flowers that bloom in June.

Flowering Branch of Paeonia Tenuifolia Flore-Pleno

Paeonia tenuifolia flore-pleno is a variety of peony. Flore-pleno is the double state. The tenuifolia…

The common name of paeonia is peony. The wittmanniana variety yellowish white flowers. The flowers bloom in April. Each stem has one flower head.

Flowering Branch of Paeonia Wittmanniana

The common name of paeonia is peony. The wittmanniana variety yellowish white flowers. The flowers bloom…

The common names of paeonia are paeony, peony, and piony. The follicles burst open.

Follicles of Paeonia

The common names of paeonia are paeony, peony, and piony. The follicles burst open.

Palafoxia hookeriana flowers are freely produced in loose clusters. The stems are very bushy and about two feet high. The flowers are rosy pink.

Palafoxia Hookeriana

Palafoxia hookeriana flowers are freely produced in loose clusters. The stems are very bushy and about…

"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…

pinnate leaved palm that produces thick clusters of red flowers and fruit that produces high quality palm oils.

Oil palm

pinnate leaved palm that produces thick clusters of red flowers and fruit that produces high quality…

Panax murrayi has many flowered umbels. The leaves are often several feet long.

Panax Murrayi

Panax murrayi has many flowered umbels. The leaves are often several feet long.

Pancratium illyricum flowers are small and fragrant. The leaves are broad and strongly veined. The plant grows one and a half feet tall.

Pancratium Illyricum

Pancratium illyricum flowers are small and fragrant. The leaves are broad and strongly veined. The plant…

Pancratium maritimum flowers are long and very fragrant. The plant grows two feet tall.

Habit and Detached Flower of Pancratium Maritiumum

Pancratium maritimum flowers are long and very fragrant. The plant grows two feet tall.

Two pansies.

Two Pansies

Two pansies.

Pansy is the common name of viola tricolor.

Pansy

Pansy is the common name of viola tricolor.