Nerium - WikiHQ

Nerium oleander ( ), commonly known as oleander, rose laurel, be-still tree or rosebay, is a shrub or small tree cultivated worldwide in temperate and subtropical areas as an ornamental and landscaping plant. It is the only species currently classified in the genus Nerium, belonging to subfamily Apocynoideae of the dogbane family Apocynaceae. It is so widely cultivated that no precise region of origin has been identified, though it is usually associated with the Mediterranean Basin.

Nerium grows to tall. It is most commonly grown in its natural shrub form, but can be trained into a small tree with a single trunk. It is tolerant to both drought and inundation, but not to prolonged frost. White, pink or red five-lobed flowers grow in clusters year-round, peaking during the summer. The fruit is a long narrow pair of follicles, which splits open at maturity to release numerous downy seeds.

Nerium is a poisonous plant but its bitterness renders it unpalatable to humans and most animals, so poisoning cases are rare and the general risk for human mortality is low. Ingestion of larger amounts may cause nausea, vomiting, excess salivation, abdominal pain, bloody diarrhea and irregular heart rhythm. Prolonged contact with sap may cause skin irritation, eye inflammation and dermatitis.

Description

right|Detail of the candy-striped corona and feathery style of a single peach-colored flower|thumb

Oleander grows to tall, with erect stems that splay outward as they mature; first-year stems have a glaucous bloom, while mature stems have a grayish bark. The leaves are in pairs or whorls of three, thick and leathery, dark-green, narrow lanceolate, long and broad, and with an entire margin filled with minute reticulate venation web typical of eudicots. The leaves are light green and very glossy when young, maturing to a dull dark green.

The flowers grow in clusters at the end of each branch; they are white, pink to red, diameter, with a deeply 5-lobed fringed corolla round the central corolla tube. They are often, but not always, sweet-scented. The fruit is a long narrow pair of follicles long, which splits open at maturity to release numerous downy seeds.

Taxonomy

Nerium oleander is the only species currently classified in the genus Nerium. It belongs to (and gives its name to) the small tribe Nerieae of subfamily Apocynoideae of the dogbane family Apocynaceae. The genera most closely related thus include the equally ornamental (and equally toxic) Adenium G.Don and Strophanthus DC. - both of which contain (like oleander) potent cardiac glycosides that have led to their use as arrow poisons in Africa. The three remaining genera Alafia Thouars, Farquharia Stapf and Isonema R.Br. are less well known in cultivation.

Synonymy

thumb|Tree in [[Brazil, with white flowers only]]

The plant has been described under a wide variety of names that are today considered its synonyms:

Oleander Medik.
Nerion Tourn. ex St.-Lag.
Nerion oleandrum St.-Lag.
Nerium carneum Dum.Cours.
Nerium flavescens Spin
Nerium floridum Salisb.
Nerium grandiflorum Desf.
Nerium indicum Mill.
Nerium japonicum Gentil
Nerium kotschyi Boiss.
Nerium latifolium Mill.
Nerium lauriforme Lam.
Nerium luteum Nois. ex Steud.
Nerium madonii M.Vincent
Nerium mascatense A.DC.
Nerium odoratissimum Wender.
Nerium odoratum Lam.
Nerium odorum Aiton
Nerium splendens Paxton
Nerium thyrsiflorum Paxton
Nerium verecundum Salisb.
Oleander indica (Mill.) Medik.
Oleander vulgaris Medik.

Etymology

The taxonomic name Nerium oleander was first assigned by Linnaeus in 1753. The genus name Nerium is the Latinized form of the Ancient Greek name for the plant nẽrion (νήριον), which is in turn derived from the Greek for water, nẽros (νηρός), because of the natural habitat of the oleander along rivers and streams.

The origins of the species name are disputed. The word oleander appears as far back as the first century AD, when the Greek physician Pedanius Dioscorides cited it as one of the terms used by the Romans for the plant. Merriam-Webster believes the word is a Medieval Latin corruption of Late Latin names for the plant: arodandrum or lorandrum, or more plausibly rhododendron (another Ancient Greek name for the plant), with the addition of olea because of the superficial resemblance to the olive tree (Olea europea) Another theory posited is that oleander is the Latinized form of a Greek compound noun: οllyo (ὀλλύω) 'I kill', and the Greek noun for man, aner, genitive andros (ἀνήρ, ἀνδρός). ascribed to oleander's toxicity to humans.

The etymological association of oleander with the bay laurel has continued into the modern day: in France the plant is known as "laurier rose", while the Spanish term, "Adelfa", is the descendant of the original Ancient Greek name for both the bay laurel and the oleander, daphne, which subsequently passed into Arabic usage and thence to Spain.

The ancient city of Volubilis in Morocco may have taken its name from the Berber name alili or oualilt for the flower.

Distribution and habitat

thumb|A [[wadi in Libya|alt=Oleander growing wild in a wadi, Libya]]

Nerium oleander is either native or naturalized to a broad area from northwest Africa through the Mediterranean region and warmer areas of the Black Sea region, Arabian Peninsula, southern Asia, and as far east as Yunnan in southern parts of China. It can be found in tropical, subtropical, and temperate regions. The plant typically occurs in dry locations with a lot of sun near stream beds where it can alternatively tolerate long seasons of drought and inundation from winter rains. There are estimated to be 25 million oleanders planted along highways and roadsides throughout the state of California. Moody Gardens in Galveston hosts the propagation program for the International Oleander Society, which promotes the cultivation of oleanders. New varieties are hybridized and grown on the Moody Gardens grounds, encompassing every named variety.

Beyond the traditional Mediterranean and subtropical range of oleander, the plant can also be cultivated in mild oceanic climates with the appropriate precautions. It is grown without protection in warmer areas in Switzerland, southern and western Germany and southern England and can reach great sizes in London and to a lesser extent in Paris due to the urban heat island effect. This is also the case with North American cities in the Pacific Northwest like Portland, Seattle, and Vancouver. Plants may suffer damage or die back in such marginal climates during severe winter cold but will rebound from the roots.

Ecology

Some invertebrates are known to be unaffected by oleander toxins, and feed on the plants. Caterpillars of the polka-dot wasp moth (Syntomeida epilais) feed specifically on oleanders and survive by eating only the pulp surrounding the leaf-veins, avoiding the fibers. Larvae of the common crow butterfly (Euploea core) and oleander hawk-moth (Daphnis nerii) also feed on oleanders, and they retain or modify toxins, making them unpalatable to potential predators such as birds, but not to other invertebrates such as spiders and wasps.

The flowers require insect visits to set seed, and seem to be pollinated through a deception mechanism. The showy corolla acts as a potent advertisement to attract pollinators from a distance, but the flowers are nectarless and offer no reward to their visitors. They therefore receive very few visits, as typical of many rewardless flower species. Fears of honey contamination with toxic oleander nectar are therefore unsubstantiated.

Leaf scorch

thumb|Infected with [[Xylella fastidiosa|X. fastidiosa in Phoenix]]

A bacterial disease known as (Xylella fastidiosa subspecies sandyi The disease has since devastated hundreds of thousands of shrubs mainly in Southern California, but also on a smaller scale in Arizona, Nevada and Texas. The culprit is a bacterium which is spread via insects (the glassy-winged sharpshooter primarily) which feed on the tissue of oleanders and spread the bacteria. This inhibits the circulation of water in the tissue of the plant, causing individual branches to die until the entire plant is consumed.

Symptoms of leaf scorch infection may be slow to manifest themselves, but it becomes evident when parts of otherwise healthy oleanders begin to yellow and wither, as if scorched by heat or fire. Die-back may cease during winter dormancy, but the disease flares up in summer heat while the shrub is actively growing, which allows the bacteria to spread through the xylem of the plant. As such it can be difficult to identify at first because gardeners may mistake the symptoms for those of drought stress or nutrient deficiency.

Pruning out affected parts can slow the progression of the disease but not eliminate it.

Cultivation

History

thumb|right|An Oleander, an 1882 painting by [[Lawrence Alma-Tadema. ]]

Nerium oleander has a history of cultivation going back millennia, especially amongst the great ancient civilizations of the Mediterranean Basin. Some scholars believe it to be the rhodon (rose), also called the 'Rose of Jericho', mentioned in apocryphal writings (Sirach 24:14) dating back to between 450 and 180 BC.

The ancient Greeks had several names for the plant, including rhododaphne, nerion, rhododendron and rhodon.

Both Pliny and Dioscorides stated that oleander was an effective antidote to venomous snake bites if mixed with rue and drunk. However, both rue and oleander are poisonous themselves, and consuming them after a venomous snake bite can accelerate the rate of mortality and increase fatalities.

A 2014 article in the medical journal Perspectives in Biology and Medicine posited that oleander was the substance used to induce hallucinations in the Pythia, the female priestess of Apollo, also known as the Oracle of Delphi in Ancient Greece. According to this theory, the symptoms of the Pythia's trances (enthusiasmos) correspond to either inhaling the smoke of or chewing small amounts of oleander leaves, often called by the generic term laurel in Ancient Greece, which led to confusion with the bay laurel that ancient authors cite.

In his book Enquiries into Plants of circa 300 BC, Theophrastus described (among plants that affect the mind) a shrub he called onotheras, which modern editors render oleander: "the root of onotheras [oleander] administered in wine", he alleges, has a beneficial effect on mood:

<blockquote>The root of onotheras [oleander] administered in wine makes the temper gentler and more cheerful. The plant has a leaf like that of the almond, but smaller, and the flower is red like a rose. The plant itself (which loves hilly country) forms a large bush; the root is red and large, and, if this is dried, it gives off a fragrance like wine.</blockquote>

In another mention, of "wild bay" (Daphne agria), Theophrastus appears to intend the same shrub.

Oleander was a very popular ornamental shrub in Roman peristyle gardens; it is one of the flora most frequently depicted on murals in Pompeii and elsewhere in Italy. These murals include the famous garden scene from the House of Livia at Prima Porta outside Rome, and those from the House of the Wedding of Alexander and the Marine Venus in Pompeii.

Carbonized fragments of oleander wood have been identified at the Villa Poppaea in Oplontis, likewise buried by the eruption of Mount Vesuvius in 79 AD. Hardy versions like white, red and pink oleander will tolerate occasional light frost down to ,

Colors and varieties

Oleander flowers are showy, profuse, and often fragrant, which makes them very attractive in many contexts. Over 400 cultivars have been named, with several additional flower colors not found in wild plants having been selected, including yellow, peach and salmon. Many cultivars, like 'Hawaii' or 'Turner's Carnival', are multi-colored, with brilliant striped corollas. The solid whites, reds and a variety of pinks are the most common. Double flowered cultivars like 'Mrs. Isadore Dyer' (deep pink), 'Mathilde Ferrier' (yellow) or 'Mont Blanc' (white) are enjoyed for their large, rose-like blooms and strong fragrance. There is also a variegated form, 'Variegata', featuring leaves striped in yellow and white.

Toxicity

thumb|[[Oleandrin, one of the toxins present in oleander]]

Oleander is a poisonous plant, containing the toxic steroidal aglycone cardenolide-type cardiac glycosides odorosiside, adigoside, and oleandrin, especially when consumed in large amounts. These compounds have a narrow therapeutic index and are toxic when ingested. Adverse effects after ingestion include weakness, diarrhoea, nausea, vomiting, headache, stomach pain, and death.

Toxicity studies of animals concluded that birds and rodents were observed to be relatively insensitive to the administered oleander cardiac glycosides. Other mammals, however, such as dogs and humans, are relatively sensitive to the effects of cardiac glycosides and the clinical manifestations of "glycoside intoxication".

It is also hazardous to animals such as sheep, horses, cattle, and other grazing animals, with as little as 100 g being enough to kill an adult horse. Plant clippings are especially dangerous to horses, as they are sweet. In July 2009, several horses were poisoned in this manner from the leaves of the plant. Symptoms of a poisoned horse include severe diarrhea and abnormal heartbeat. This is aptly reflected in the plant's Sanskrit name aśvamāra (अश्वमार), a compound of aśva "horse" and māra "killing".

In reviewing oleander toxicity cases seen in-hospital, Lanford and Boor concluded that, except for children who might be at greater risk, "the human mortality associated with oleander ingestion is generally very low, even in cases of moderate intentional consumption (suicide attempts)." Because oleander is extremely bitter, officials speculated that the toddlers had developed a condition caused by malnutrition, pica, which causes people to eat otherwise inedible material.

Effects of poisoning

Ingestion of this plant can affect the gastrointestinal system, the heart, and the central nervous system. The main effect of cardiotoxic glycosides is positive inotropy. Glycosides bind to the sarcolemma transmembrane ATPase of cardiac muscle cells and compete with K+ ions, inactivating the enzyme. This results in an accumulation of Na+ and Ca2+ ions into the cardiac muscle cells, leading to stronger and faster heart contractions. Moreover, the increased amount of extracellular K+ ions may lead to lethal hyperkalemia. Therefore, clinical features of oleander poisoning are similar to digoxin toxicity and include nausea, diarrhea, and vomiting due to stimulation of the area postrema of the medulla oblongata, neuropsychic disorders, and pathological motor manifestations. Oleander poisoning can also result in blurred vision, and vision disturbances, including halos appearing around objects. Oleander sap can cause skin irritations, severe eye inflammation and irritation, and allergic reactions characterized by dermatitis.

The severity of the intoxication can vary based on the quantity ingested and an individual's physiological response, as well as the time of symptom onset after oleander ingestion: they can rapidly occur after drinking teas prepared with oleander leaves or roots or develop more slowly due to the ingestion of unprepared plant parts.

Treatment

Poisoning and reactions to oleander plants are evident quickly, requiring immediate medical care in suspected or known poisonings of both humans and animals.

Drying of plant materials does not eliminate the toxins. There is a wide range of toxins and secondary compounds within oleander, and care should be taken around this plant due to its toxic nature. Different names for oleander are used around the world in different locations, so, when encountering a plant with this appearance, regardless of the name used for it, one should exercise great care and caution to avoid ingestion of any part of the plant, including its sap and dried leaves or twigs. The dried or fresh branches should not be used for spearing food, for preparing a cooking fire, or as a food skewer. Many of the oleander relatives, such as the desert rose (Adenium obesum) found in East Africa, have similar leaves and flowers and are equally toxic.

Research

Drugs derived from N. oleander have been investigated as a treatment for cancer, but have failed to demonstrate clinical utility. According to the American Cancer Society, the trials conducted so far have produced no evidence of benefit, while they did cause adverse side effects.

Culture

Oracle of Delphi

In a research study done by Haralampos V. Harissis, he claims that the laurel the Pythia is commonly depicted with is actually an oleander plant, and the poisonous plant and its subsequent hallucinations are the source of the oracle's mystical power and subsequent prophecies. Many of the symptoms that primary sources such as Plutarch and Democritus report align with results of oleander poisoning. Harissis also provides evidence claiming that the word laurel may have been used to describe an oleander leaf.

Folklore

The toxicity of the plant makes it the center of an urban legend documented on several continents and over more than a century. Often told as a true and local event, typically an entire family, or in other tellings a group of scouts, succumbs after consuming hot dogs or other food roasted over a campfire using oleander sticks. Some variants tell of this happening to Napoleon's or Alexander the Great's soldiers.

In Charleston, South Carolina, local folklore describes John and Lavinia Fisher as having poisoned the guests in their inn with oleander tea for the purpose of robbing them, though contemporaneous accounts do not corroborate the story.

There is an ancient account mentioned by Pliny the Elder in his Natural History, who described a region in Pontus in Turkey where the honey was poisoned from bees having pollinated poisonous flowers, with the honey left as a poisonous trap for an invading army. The flowers have sometimes been mis-translated as oleander,

Oleander is the official flower of the city of Hiroshima, having been the first to bloom following the atomic bombing of the city in 1945.

In painting

thumb|Oleanders by [[Vincent van Gogh]]

Oleander was part of subject matter of paintings by famous artists including:

Gustav Klimt, who painted Two Girls with an Oleander between 1890 and 1892.
Vincent van Gogh painted his famous Oleanders in Arles in 1888. Van Gogh found the flowers "joyous" and "life-affirming" because of their inexhaustible blooms and vigour.
Anglo-Dutch artist Sir Lawrence Alma-Tadema incorporated oleanders into his classically inspired paintings, including An Oleander (1882), Courtship, Under the Roof of Blue Ionian Weather and A Roman Flower Market (1868).
The Terrace at Méric (Oleanders), an 1867 Impressionist painting by Frédéric Bazille.

In literature, film and music

Janet Fitch's 1999 novel White Oleander is centered around a young Southern California girl's experiences growing up in foster care after her mother is imprisoned for poisoning an ex-boyfriend with the plant. The book was adapted into a 2002 film of the same name starring Michelle Pfeiffer and Alison Lohman.
In the 17th century AD Farsi-language book the Jahangirnama, the Mughal emperor Jahangir passes a stream overgrowing with oleanders along its banks. He orders the nobles in his train to adorn their turbans with oleander blossoms, creating a "field of flowers" on their heads.
Steely Dan's 1973 song "My Old School" contains the line "Oleanders growing outside her door, soon they're gonna be in bloom up in Annandale" in the second verse. It has been theorized that this reference is either a metaphor for a harmful relationship, or marijuana, which is the subcontext of the song.

Gallery

File:Nerium oleander peach.jpg|alt=Peach colored flowers

File:Nerium Oleander (yellow, unusual--may be Sue Hawley Oakes).jpg|alt=Unusual yellow-flowered variety. Cultivated, Galveston|Cultivated, Galveston

File:Original Oleander Planting in Galveston.jpg|First oleander planted in Galveston (1841)

File:Nerium Oleander(Red).jpg|alt=Red flower

File:Oleander Capsule Opens.jpg|Follicle spreading seeds

File:Nerium oleander pink.jpg|alt=Pink flowers and leaves

File:Nerium oleander Ouarzazate wild1.jpg|alt=Small bush

File:RoscheiderhofHerbst2018H3a.jpg|alt=Small tree

File:Flowers of Nerium oleander in West Bengal, India.jpg|alt=Flowers of N. oleander in West Bengal|N. oleander in West Bengal

File:OleaUA2013.jpg| Closed buds of an oleander shrub near Yalta, Ukraine

</gallery>

Notes

References

External links

Oleander Facts. Clemson University. Retrieved on 2018-03-26.
Information on Oleander toxicity. International Oleander Society. Retrieved on 2009-07-27.
Plants of North Africa. Jardí Botànic de Barcelona Retrieved on 2009-07-27.
Medical problems caused by plants: Plant Toxins, Cardiac Glycosides. Erwin, Van den Enden. 2004. Illustrated Lecture Notes on Tropical Medicine. Prince Leopold Institute of Tropical Medicine. Retrieved on 2009-07-27.
Cardiac glycosides. Desai, Umesh R. Virginia Commonwealth University. School of Pharmacy. Retrieved on 2009-07-27.
Legend of Oleander-poisoning at Campfire. Snopes. Retrieved on 2009-07-27.
Distribution over the world, N. oleander, University of Helsinki