Nerium
Nerium | |
---|---|
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Clade: | Asterids |
Order: | Gentianales |
Family: | Apocynaceae |
Subfamily: | Apocynoideae |
Tribe: | Nerieae |
Genus: | Nerium L. |
Species: | N. oleander
|
Binomial name | |
Nerium oleander L.
| |
Synonyms | |
Numerous, see text |
Nerium oleander (/ˈnɪəriəm ... / NEER-ee-əm),[2] commonly known as oleander or rosebay,[3] 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 2–6 metres (7–20 feet) 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 contains several toxic compounds, and it has historically been considered a
Description
Oleander grows to 2–6 metres (7–20 feet) tall, with erect stems that splay outward as they mature; first-year stems have a
The flowers grow in clusters at the end of each branch; they are white, pink to red, 5–23 cm (2–9 in) 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
Synonymy
The plant has been described under a wide variety of names that are today considered its synonyms:[5][6]
- 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.[7] 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
The etymological association of oleander with the
The ancient city of
Distribution and habitat
Nerium oleander is either native or naturalized to a broad area spanning from Northwest Africa and Iberian and Italian Peninsula eastward through the
On the East Coast of the US, it grows as far north as
Beyond the traditional Mediterranean and
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.[28]
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.[29][30] Fears of honey contamination with toxic oleander nectar are therefore unsubstantiated.
Leaf scorch
A bacterial disease known as oleander leaf scorch (
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
Pruning out affected parts can slow the progression of the disease but not eliminate it.[32] This malaise can continue for several years until the plant completely dies—there is no known cure.[20] The best method for preventing further spread of the disease is to prune infected oleanders to the ground immediately after the infection is noticed.
The responsible pathogen was identified as the subspecies sandyi by Purcell et al., 1999.[31]
Cultivation
History
Nerium oleander has a history of cultivation going back millennia, especially amongst the great ancient civilizations of the
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.[41] 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, "makes the temper gentler and more cheerful".
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.
In another mention, of "wild bay" (Daphne agria), Theophrastus appears to intend the same shrub.[42]
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.[43]
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.[11] They were found to have been planted in a decorative arrangement with citron trees (Citrus medica) alongside the villa's swimming pool.
Herbaria of oleander varieties are compiled and held at the Smithsonian Institution in Washington, D.C., and at Moody Gardens in Galveston, Texas.[22]
Ornamental gardening
Oleander is a vigorous grower in warm subtropical regions, where it is extensively used as an ornamental plant in parks, along roadsides and in private gardens. It is most commonly grown in its natural shrub form, but can be trained into a small tree with a single trunk.[44] Hardy versions like white, red and pink oleander will tolerate occasional light frost down to −10 °C (14 °F),[18] though the leaves may be damaged. The toxicity of oleander renders it deer-resistant and its large size makes for a good windbreak – as such it is frequently planted as a hedge along property lines and in agricultural settings.
The plant is tolerant of poor soils, intense heat, salt spray, and sustained drought – although it will flower and grow more vigorously with regular water. Although it does not require pruning to thrive and bloom, oleander can become unruly with age and older branches tend to become gangly, with new growth emerging from the base. For this reason gardeners are advised to prune mature shrubs in the autumn to shape and induce lush new growth and flowering for the following spring.
In Mediterranean climates oleanders can be expected to bloom from April through October, with the heaviest bloom usually occurring between May and June. Free-flowering varieties like 'Petite Salmon' or 'Mont Blanc' require no period of rest and can flower continuously throughout the year if the weather remains warm.
In cold winter climates, oleander is a popular summer potted plant readily available at most nurseries. They require frequent heavy watering and fertilizing as compared to being planted in the ground, but oleander is nonetheless an ideal flowering shrub for patios and other spaces with hot sunshine. During the winter they should be moved indoors, ideally into an unheated greenhouse or basement where they can be allowed to go dormant.
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.[46] 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.[34] Several dwarf cultivars have also been developed, offering a more compact form and size for small spaces. These include 'Little Red', 'Petite White', 'Petite Pink' and 'Petite Salmon', which grow to about 8 feet (2.4 m) at maturity.[47]
Toxicity
Oleander has historically been considered a
Toxicity studies of animals concluded that birds and rodents were observed to be relatively insensitive to the administered oleander cardiac glycosides.[48] Other mammals, however, such as dogs and humans, are relatively sensitive to the effects of cardiac glycosides and the clinical manifestations of "glycoside intoxication".[48][49][50]
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.[51] 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.[52] 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[53] 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)."[53] In 2000, a rare instance of death from oleander poisoning occurred when two toddlers adopted from an orphanage ate the leaves from a neighbor's shrub in El Segundo, California.[54] 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.[55]
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.[17] Cardiotoxic glycosides are also responsible for stimulating the vagus nerve (leading to sinus bradycardia) and the phrenic nerve (leading to hyperventilation), and lethal brady- and tachyarrhythmias, including asystole and ventricular fibrillation.[56] Oleander poisoning can also result in blurred vision, and vision disturbances, including halos appearing around objects.[57] Oleander sap can cause skin irritations, severe eye inflammation and irritation, and allergic reactions characterized by dermatitis.[58]
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.[59]
Treatment
Poisoning and reactions to oleander plants are evident quickly, requiring immediate medical care in suspected or known poisonings of both humans and animals.[58] Induced vomiting and gastric lavage are protective measures to reduce absorption of the toxic compounds. Activated carbon may also be administered to help absorb any remaining toxins.[17] Further medical attention may be required depending on the severity of the poisoning and symptoms. Temporary cardiac pacing will be required in many cases (usually for a few days) until the toxin is excreted.[citation needed]
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.[citation needed]
Research
Drugs derived from N. oleander have been investigated as a treatment for cancer, but have failed to demonstrate clinical utility.[61][62] According to the American Cancer Society, the trials conducted so far have produced no evidence of benefit, while they did cause adverse side effects.[63]
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.[64]
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.[65] Some variants tell of this happening to Napoleon's or Alexander the Great's soldiers.[66]
There is an ancient account mentioned by Pliny the Elder in his Natural History,[39] 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.[67][68][69] The flowers have sometimes been mis-translated as oleander,[11] but oleander flowers are nectarless and therefore cannot transmit any toxins via nectar.[29] The actual flower referenced by Pliny was either Azalea or Rhododendron, which is still used in Turkey to produce a hallucinogenic honey.[70]
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.[71]
In painting
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.[72]
- 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.[73]
- 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"[74]and "A Roman Flower Market" (1868).
- "The Terrace at Méric (Oleanders)", an 1867 Impressionist painting by Frédéric Bazille.[75]
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.[76] 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.[77]
- 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.[78]
- The Yeasayer song "I Am Chemistry" contains the refrain "My momma told me not to fool with oleander, and never handle the deadly quaker buttons again".
- Indie rock band Mother Mother has a song called "Oleander" on their 2011 album Eureka.
In video games
- Red Dead Redemption 2 features a deadly plant, oleander sage, which may be used to craft poisonous weapons, and is based on nerium oleander.
Gallery
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Cultivated, Galveston
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First oleander planted in Galveston (1841)
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Follicle spreading seeds
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N. oleander in West Bengal
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Closed buds of an oleander shrub near Yalta, Ukraine
See also
- Cascabela thevetia (yellow oleander)
- List of ineffective cancer treatments
- List of plants poisonous to equines
- List of poisonous plants
- Tibesti-Jebel Uweinat montane xeric woodlands
Notes
- ^ The "Yellow Oleander" is Cascabela thevetia
- ^ In the past, scented plants were sometimes treated as the distinct species N. odorum, but the character is not constant and it is no longer regarded as a separate taxon.
- ^ Cf. oleaster
References
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- ISBN 978-0-376-03850-0.
- doi:10.1093/OED/4058348783. (Subscription or participating institution membershiprequired.)
- ISBN 978-90-5782-204-9.
- ^ "World Checklist of Selected Plant Families, entry for Nerium oleander". Retrieved May 18, 2014.
- ^ "World Checklist of Selected Plant Families, entry for Nerium". Retrieved May 18, 2014.
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- ^ a b "Oleander Leaf Scorch". University of California Agriculture & Natural Resources. April 2008. Retrieved 2017-05-14.
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- ^ a b c d Kathleen Norris Brenzel (2007). Sunset Western Garden Book. p. 495.
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- ^ Ecclesiasticus XXXIV, 13.
- ^ a b John McClintock (1880). Cyclopaedia of Biblical, Theological, and Ecclesiastical Literature. p. 129–130.
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- ^ a b Pliny. Natural History. p. 24.90.
- ^ Pedanius Dioscorides. De Materia Medica. p. V.42.
- ^ Harissis, Haralampos. "A Bittersweet Story: The True Nature of the Laurel of the Oracle of Delphi". Perspectives in Biology and Medicine. pp. 351–60.
- ^ Theophrastus. Inquiry into Plants. Translated by A. F. Hort. Loeb Classical Library. pp. I.9.3, IX.19.1.
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- ^ Linda French (1989-07-01). "Gardening : Nerium oleander : Petite oleanders: Evergreen drought-tolerant dwarf shrubs with showy flowers". Los Angeles Times. Retrieved 2017-05-14.
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- ^ Trevino, Monica (2009). "Dozens of horses poisoned at California farm". CNN. Retrieved 2009-08-03.
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- ^ Associated Press (2000-07-25). "Oleander Poisoning Kills 2 Kids". apnews.com. Retrieved 2018-07-01.
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- ^ a b Goetz, Rebecca. J. (1998). "Oleander". Indiana Plants Poisonous to Livestock and Pets. Cooperative Extension Service, Purdue University. Archived from the original on 2010-02-23. Retrieved 2009-07-27.
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- ^ Pliny. Natural History. p. 21.77.
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- ^ William John Hamilton (1842). Researches in Asia Minor, Pontus, and Armenia: With Some Account of Their Antiquities and Geology [in 1836]. John Murray. p. 384.
- ^ Bryce, Emma (2014-09-04). "The Strange History of 'Mad Honey'". Modern Farmer. Retrieved 2019-08-09.
- ^ Tredici, PD; Tsuchida, H (1993). "Hibaku trees of Hiroshima" (PDF). Arnoldia: 27.
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- ^ Russell Ash (1992). Sir Lawrence Alma-Tadema. Harry Abrams.
- ^ "The Terrace at Méric (Oleanders)". wikiart.org. Retrieved 2018-06-08.
- ^ "White Oleander". Oprah.com. 1999-05-06. Retrieved 2017-06-08.
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External links
- Data related to Nerium at Wikispecies
- Media related to Nerium oleander at Wikimedia Commons
- 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
- Nerium oleander - informative article about Nerium oleander