289 illustrations of flowers and shrubs including: narcissus, nelumbo, nettle, nightshade, oleander, olive, opium, orchid, orpine, oxalis, and oxeye

Pollinium of an Orchis with some of the packets or partial pollinia.

Orchis

Pollinium of an Orchis with some of the packets or partial pollinia.

One of the partial pollinia, torn up at top to show the grains (which are each composed of four).

Orchis

One of the partial pollinia, torn up at top to show the grains (which are each composed of four).

This is an illustration of oneidium papilio and comparettia rosea, two epiphytes of the Orchis family. It is ment to show the mode in which these air-plants grow.

Orchis Family

This is an illustration of oneidium papilio and comparettia rosea, two epiphytes of the Orchis family.…

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…

Fern belonging to the Blechnaceae family, native to warm subtropics in the Northern Hemisphere.

Woodwardia Orientalis

Fern belonging to the Blechnaceae family, native to warm subtropics in the Northern Hemisphere.

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…

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…

Of the orpine family (Crassulaceae), the ditch stonecrop or Penthorum sedoides.

Ditch Stonecrop

Of the orpine family (Crassulaceae), the ditch stonecrop or Penthorum sedoides.

Of the orpine family (Crassulaceae), the live-forever or garden orpine (Sedum purpureum).

Live-Forever or Garden Orpine

Of the orpine family (Crassulaceae), the live-forever or garden orpine (Sedum purpureum).

Of the orpine family (Crassulaceae), the wild stonecrop or Sedum ternatum.

Wild Stonecrop

Of the orpine family (Crassulaceae), the wild stonecrop or Sedum ternatum.

The two coverings of the ovule are called the inner and outer coats.

Orthotropous Ovule in Section

The two coverings of the ovule are called the inner and outer coats.

A shows the nucellus alone. B shows the inner coat. C hows both coats growing to cover nucellus.

Three Stages in Growth of Orthotropous Ovule

A shows the nucellus alone. B shows the inner coat. C hows both coats growing to cover nucellus.

Two individuals of an Oscillaria.

Oscillaria

Two individuals of an Oscillaria.

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…

Fruit (cremocarp) of Osmorrhiza; the two akene-like ripe carpals separating at maturity from a slender axis or carpophores.

Osmorrhiza

Fruit (cremocarp) of Osmorrhiza; the two akene-like ripe carpals separating at maturity from a slender…

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.

Oswego tea, bee balm, and fragrant balm are the common names of <i>monarda didyma</i>. The stems are angled. The leaves are thin, oval, and tapered.

Oswego Tea

Oswego tea, bee balm, and fragrant balm are the common names of monarda didyma. The stems are angled.…

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…

Illustrated are transverse sections of ovaries of (a) <i>synocarpous</i> and (b) <i>apocarpous</i>.

Transverse Sections of Ovaries

Illustrated are transverse sections of ovaries of (a) synocarpous and (b) apocarpous.

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).

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 the flower of the Morning Glory, cut in half.

Morning Glory Ovary

Ovary of the flower of the Morning Glory, cut in half.

Ovary of the flower of the Morning Glory, cut in cross-section.

Morning Glory Ovary

Ovary of the flower of the Morning Glory, cut in cross-section.

Ovary of a prunella plant.

Prunella ovary

Ovary of a prunella plant.

Cultivated for sheep pasturage or lawn type grass.

Festuca Ovina

Cultivated for sheep pasturage or lawn type grass.

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 cluster of ovules, pendulous on their funicles

Ovules

A cluster of ovules, pendulous on their funicles

A fern with short, ovate fronds.

Polypodium Lycopodioides Owariense

A fern with short, ovate fronds.

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…

"Development of an oxalis leaf. A, full-grown leaf; B, rudimentary leaf, the leaflets not yet evident; C, more advanced stage, the leaflets appearing; D, a still more advanced stage." -Bergen, 1896

Oxalis Leaf Development

"Development of an oxalis leaf. A, full-grown leaf; B, rudimentary leaf, the leaflets not yet evident;…

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).

Fruit flattened dorsally; fruit prominently winged.

Oxypolis

Fruit flattened dorsally; fruit prominently winged.