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The common name of oenthera is evening primrose. The acaulis variety has white flowers fading into red. The flowers bloom May to September. The plant grows six inches high.

Habit and Detached Leaf and Flower of Oenothera Acaulis

The common name of oenthera is evening primrose. The acaulis variety has white flowers fading into red.…

Oenothera amoena rubicunda is a variety of evening primrose with rose flowers with four crimson spots. The flowers bloom in summer.

Flowering Branch of Oenothera Amoena Rubicunda

Oenothera amoena rubicunda is a variety of evening primrose with rose flowers with four crimson spots.…

The common name of oenothera biennis is common evening primrose. The lamarckiana variety has larger and finer flowers.

Oenothera Biennis Lamarckiana

The common name of oenothera biennis is common evening primrose. The lamarckiana variety has larger…

Oenothera exima is a variety of evening primrose with white flowers that are four inches in diameter. The flowers bloom in July.

Oenothera Exima

Oenothera exima is a variety of evening primrose with white flowers that are four inches in diameter.…

Oenothera missouriensis latifolia flowers are large and yellow. The leaves are broad.

Oenothera Missouriensis Latifolia

Oenothera missouriensis latifolia flowers are large and yellow. The leaves are broad.

Oenothera speciosa is a variety of evening primrose with white flowers that become reddish as they fade. The flowers bloom March to September.

Flowering Branch of Oenothera Speciosa

Oenothera speciosa is a variety of evening primrose with white flowers that become reddish as they fade.…

Oenthera Lady Albemarle has distinct, showy crimson flowers. It is a dwarf variety.

Oenothera Lady Albemarle

Oenthera Lady Albemarle has distinct, showy crimson flowers. It is a dwarf variety.

Olearia gunnia flowers are white and bloom in September. The branches are hoary. Pictured is a flowering branch, branchlet, and flower head of olearia gunnia.

Olearia Gunniana

Olearia gunnia flowers are white and bloom in September. The branches are hoary. Pictured is a flowering…

Omphalodes verna flowers are blue with a white throat. The flowers bloom March to May. The plant grows six inches tall.

Omphalodes Verna

Omphalodes verna flowers are blue with a white throat. The flowers bloom March to May. The plant grows…

Oncidium crispum flowers are one to two inches across. The flowers are a bright, rich, copper color and the lip is blotched with golden yellow. The flowers bloom in winter.

Flowers of Oncidium Crispum

Oncidium crispum flowers are one to two inches across. The flowers are a bright, rich, copper color…

Oncidium excavatum flowers are golden yellow and they are spotted and blotched at the base with rich, bright brown. This variety is native to Peru.

Oncidium Excavatum

Oncidium excavatum flowers are golden yellow and they are spotted and blotched at the base with rich,…

Oncidium luridum flowers are usually a dull yellow or olive green color splotched with brown.

Flower of Oncidium Luridum

Oncidium luridum flowers are usually a dull yellow or olive green color splotched with brown.

Butterfly plant is the common name of oncidium papilio. The flowers are pale, golden yellow barred with chesnut brown. The flowers sometimes resemble a butterfly in shape.

Habit and Detached Flower of Oncidium Papilio

Butterfly plant is the common name of oncidium papilio. The flowers are pale, golden yellow barred with…

Oncidium serratum flowers are usually rich, bright brown with a yellow border. The margins are crisped or very serrated.

Flower of Oncidium Serratum

Oncidium serratum flowers are usually rich, bright brown with a yellow border. The margins are crisped…

The sepals and petals of oncidium varicosum flowers are pale, dull green with dull brown. The lip is large and bright yellow. The scapes are strong, about three feet long.

Flowers of Oncidium Varicosum

The sepals and petals of oncidium varicosum flowers are pale, dull green with dull brown. The lip is…

Ononis rotundiflora flowers are rose and grow on three flowered stems. The flowers bloom in summer. The leaves are roundish and toothed.

Habit and Detached Single Flower of Ononis Rotundiflora

Ononis rotundiflora flowers are rose and grow on three flowered stems. The flowers bloom in summer.…

The common name of onosma is golden drop. The stellulatum tauricum variety has yellow flowers that are about one and a half inches long. The flowers bloom in summer. The stems are branched.

Onosma Stellulatum Tauricum

The common name of onosma is golden drop. The stellulatum tauricum variety has yellow flowers that are…

Fly orchis is the common name of ophrys muscifera. The flowers have green sepals and dark red, linear petals. The flowers bloom in June.

Flower of Fly Orchis

Fly orchis is the common name of ophrys muscifera. The flowers have green sepals and dark red, linear…

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…

Optunia brachyarthra is a variety of prickly pear. The flowers are very small. The prickles grow in groups of three to five.

Optunia Brachyarthra

Optunia brachyarthra is a variety of prickly pear. The flowers are very small. The prickles grow in…

Indian fig, the common name of optunia ficus-indica, has yellow flowers that bloom in May. The fruit is bristly and red within. The fruit is edible.

Branch of Indian Fig

Indian fig, the common name of optunia ficus-indica, has yellow flowers that bloom in May. The fruit…

Optunia multiflora is a variety of prickly pear. The flowers are yellow and bloom in summer. The branches are large and flattened. The spines are numerous and clustered.

Flowering Branch of Optunia Multiflora

Optunia multiflora is a variety of prickly pear. The flowers are yellow and bloom in summer. The branches…

Optunia rafinesquii is a variety of prickly pear. The flowers often have a red center and numerous petals. The cactus grows one foot tall.

Optunia Rafinesquii

Optunia rafinesquii is a variety of prickly pear. The flowers often have a red center and numerous petals.…

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…

Orange trees flower from February to March. The fruits grow to maturity is nine to eleven months.

Fruiting Branch of Orange

Orange trees flower from February to March. The fruits grow to maturity is nine to eleven months.

Orange trees flower from February to March. The fruits grow to maturity is nine to eleven months.

Fruiting Branch of Mandarin Orange

Orange trees flower from February to March. The fruits grow to maturity is nine to eleven months.

The sepals are the three narrower parts situated behind, and overlapped by, the petals. The dark, central spot is the opening of the nectary.

Flower of Laelia Albida

The sepals are the three narrower parts situated behind, and overlapped by, the petals. The dark, central…

The Lady's Slipper is the common name of cypripedium calceolus. The flower has two fertile stamens.

Cypripedium Calceolus

The Lady's Slipper is the common name of cypripedium calceolus. The flower has two fertile stamens.

Cypripedium spectabile is an orchid. It is also a variety of the lady's slipper.

Single Flower of Cypripedium Spectabile

Cypripedium spectabile is an orchid. It is also a variety of the lady's slipper.

Cattleya bicolor is a variety of orchid.

Flower of Cattleya Bicolor

Cattleya bicolor is a variety of orchid.

Cattleya trianae is a variety of orchid. This variety is easily obtained.

Cattleya Trianae

Cattleya trianae is a variety of orchid. This variety is easily obtained.

Lizard orchis is the common name of orchis hircina. The flower is a dirty, greenish white color with a disagreeable smell. The flowers have a long, linear lip.

Flower of Lizard Orchis

Lizard orchis is the common name of orchis hircina. The flower is a dirty, greenish white color with…

Military orchis is the common name of orchis militaris. The flowers are numerous and grow in a dense, oblong spike. The flowers bloom in spring.

Flower of Military Orchis

Military orchis is the common name of orchis militaris. The flowers are numerous and grow in a dense,…

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.

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…

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…

Pictured is the pistil from the flower of a pea. A is the pistil from the side, (o) is the ovary, (s) is the style, and (st) is the stigma. B is the pistil opened lengthwise. C is the cross section to show the position of placenta.

Pistil from Flower of Pea

Pictured is the pistil from the flower of a pea. A is the pistil from the side, (o) is the ovary, (s)…

A shows the cross section of the ovary of the gooseberry flower is formed by two carpels joined near their edges. B shows the cross section of the ovary of potato formed by two carpels meeting in the middle.

Cross Section of Ovary of Flower of Gooseberry and Potato

A shows the cross section of the ovary of the gooseberry flower is formed by two carpels joined near…

The cross section of the ovary of the iris flower shows three carpels joined at center into a mass. The three parts are clearly traceable.

Cross Section of Ovary of Flower of Iris

The cross section of the ovary of the iris flower shows three carpels joined at center into a mass.…

In the cross section from the ovary of the primrose flower the carpels are completely united. The carpels form a ring in the section.

Cross Section from Ovary of Primrose Flower

In the cross section from the ovary of the primrose flower the carpels are completely united. The carpels…

Pictured are diagrams to illustrate modifications of receptacle in longitudinal sections of flowers. The receptacle produces a flat ring which may surround the ovary.

Longitudinal Sections of Flowers

Pictured are diagrams to illustrate modifications of receptacle in longitudinal sections of flowers.…

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…

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.

The bulbs of oxalis tetraphylla are large and scaly.

Bulbs of Oxalis Tetraphylla

The bulbs of oxalis tetraphylla are large and scaly.

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.

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…

Mountain peony is the common name of paeonia moutan. The flowers are large and vary in color. The plant grows three feet tall.

Flowering Branch of Mountain Peony

Mountain peony is the common name of paeonia moutan. The flowers are large and vary in color. The plant…