Nerium odorum
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''Nerium oleander'' ( ), most commonly known as oleander or nerium, 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 Apocynoideae is a subfamily of the flowering plant family Apocynaceae (order Gentianales). It contains about 78 genera with roughly 860 species. Several genera are of pharmacological interest - notably those - such as Strophanthus - which have f ...
of the
dogbane Dogbane, dog-bane, dog's bane, and other variations, some of them regional and some transient, are names for certain plants that are reputed to kill or repel dogs; "bane" originally meant "slayer", and was later applied to plants to indicate tha ...
family
Apocynaceae Apocynaceae (from ''Apocynum'', Greek for "dog-away") is a family of flowering plants that includes trees, shrubs, herbs, stem succulents, and vines, commonly known as the dogbane family, because some taxa were used as dog poison Members of ...
. 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 contains several toxic compounds, and it has historically been considered a
poisonous plant Plants that produce toxins are referred to as poisonous plants. Plants that cause irritation on contact are also described as "poisonous". The toxins in poisonous plants affect herbivores, and deter them from consuming the plants. Plants cannot ...
. However, 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 Dermatitis is inflammation of the skin, typically characterized by itchiness, redness and a rash. In cases of short duration, there may be small blisters, while in long-term cases the skin may become thickened. The area of skin involved can ...
.


Description

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 A whorl ( or ) is an individual circle, oval, volution or equivalent in a whorled pattern, which consists of a spiral or multiple concentric objects (including circles, ovals and arcs). Whorls in nature File:Photograph and axial plane floral ...
of three, thick and leathery, dark-green, narrow
lanceolate The following is a list of terms which are used to describe leaf morphology in the description and taxonomy of plants. Leaves may be simple (a single leaf blade or lamina) or compound (with several leaflets). The edge of the leaf may be regular ...
, long and broad, and with an entire margin filled with minute reticulate venation web typical of
eudicots The eudicots, Eudicotidae, or eudicotyledons are a clade of flowering plants mainly characterized by having two seed leaves upon germination. The term derives from Dicotyledons. Traditionally they were called tricolpates or non-magnoliid dicots ...
. 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,The "Yellow Oleander" is ''
Thevetia peruviana ''Cascabela thevetia'' (syn: ''Thevetia peruviana'') is a poisonous plant native throughout Mexico and in Central America, and cultivated widely as an ornamental. It is a relative of '' Nerium oleander'', giving it a common name yellow oleander, ...
''
diameter, with a deeply 5-lobed fringed corolla round the central
corolla tube Petals are modified leaves that surround the reproductive parts of flowers. They are often brightly colored or unusually shaped to attract pollinators. All of the petals of a flower are collectively known as the ''corolla''. Petals are usuall ...
. They are often, but not always, sweet-scented.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. 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 Apocynoideae is a subfamily of the flowering plant family Apocynaceae (order Gentianales). It contains about 78 genera with roughly 860 species. Several genera are of pharmacological interest - notably those - such as Strophanthus - which have f ...
of the dogbane family
Apocynaceae Apocynaceae (from ''Apocynum'', Greek for "dog-away") is a family of flowering plants that includes trees, shrubs, herbs, stem succulents, and vines, commonly known as the dogbane family, because some taxa were used as dog poison Members of ...
. The genera most closely-related thus include the equally ornamental (and equally toxic) '' Adenium'' G.Don and ''
Strophanthus ''Strophanthus'' is a genus of flowering plants in the family Apocynaceae, first described as a genus in 1802. It is native primarily to tropical Africa, extending to South Africa, with a few species in Asia from southern India to New Guinea and ...
'' DC. - both of which contain (like oleander) potent
cardiac glycosides Cardiac glycosides are a class of organic compounds that increase the output force of the heart and decrease its rate of contractions by inhibiting the cellular sodium-potassium ATPase pump. Their beneficial medical uses are as treatments for co ...
that have led to their use as
arrow poisons Arrow poisons are used to poison arrow heads or darts for the purposes of hunting and warfare. They have been used by indigenous peoples worldwide and are still in use in areas of South America, Africa and Asia. Notable examples are the poisons se ...
in Africa. The three remaining genera ''
Alafia Alafia is a rural commune of the Cercle of Timbuktu in the Tombouctou Region of Mali Mali (; ), officially the Republic of Mali,, , ff, 𞤈𞤫𞤲𞥆𞤣𞤢𞥄𞤲𞤣𞤭 𞤃𞤢𞥄𞤤𞤭, Renndaandi Maali, italics=no, ar, ...
''
Thouars Thouars () is a commune in the Deux-Sèvres department in western France. On 1 January 2019, the former communes Mauzé-Thouarsais, Missé and Sainte-Radegonde were merged into Thouars. It is on the River Thouet. Its inhabitants are known ...
, '' Farquharia'' Stapf and '' Isonema'' R.Br. are less well-known in cultivation.


Synonymy

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 origins of the taxonomic name ''Nerium oleander'', first assigned by
Linnaeus Carl Linnaeus (; 23 May 1707 – 10 January 1778), also known after his ennoblement in 1761 as Carl von Linné Blunt (2004), p. 171. (), was a Swedish botanist, zoologist, taxonomist, and physician who formalised binomial nomenclature, the ...
in 1753, are disputed. The genus name ''Nerium'' is the Latinized form of the
Ancient Greek Ancient Greek includes the forms of the Greek language used in ancient Greece and the ancient world from around 1500 BC to 300 BC. It is often roughly divided into the following periods: Mycenaean Greek (), Dark Ages (), the Archaic p ...
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 word ''oleander'' appears as far back as the first century AD, when the Greek physician
Pedanius Dioscorides Pedanius Dioscorides ( grc-gre, Πεδάνιος Διοσκουρίδης, ; 40–90 AD), “the father of pharmacognosy”, was a Greek physician, pharmacologist, botanist, and author of '' De materia medica'' (, On Medical Material) —a 5-vo ...
cited it as one of the terms used by the Romans for the plant. Merriam-Webster believes the word is a
Medieval Latin Medieval Latin was the form of Literary Latin used in Roman Catholic Western Europe during the Middle Ages. In this region it served as the primary written language, though local languages were also written to varying degrees. Latin functione ...
corruption of
Late Latin Late Latin ( la, Latinitas serior) is the scholarly name for the form of Literary Latin of late antiquity.Roberts (1996), p. 537. English dictionary definitions of Late Latin date this period from the , and continuing into the 7th century in t ...
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'')Cf.
oleaster , signifying a plant like an olive, but less valuable (cf. poetaster), may be applied to: *Feral olive trees that have been allowed to run wild *'' Olea oleaster'', the wild olive *Various species of ''Elaeagnus'', notably ''Elaeagnus angustifolia'' ...
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 ''Laurus nobilis'' is an aromatic evergreen tree or large shrub with green, glabrous (smooth) leaves. It is in the flowering plant family Lauraceae. It is native to the Mediterranean region and is used as bay leaf for seasoning in cookin ...
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 Arabic (, ' ; , ' or ) is a Semitic language spoken primarily across the Arab world.Semitic languages: an international handbook / edited by Stefan Weninger; in collaboration with Geoffrey Khan, Michael P. Streck, Janet C. E.Watson; Walter ...
usage and thence to Spain. The ancient city of
Volubilis Volubilis (; ar, وليلي, walīlī; ber, ⵡⵍⵉⵍⵉ, wlili) is a partly excavated Berber-Roman city in Morocco situated near the city of Meknes, and may have been the capital of the kingdom of Mauretania, at least from the time of Kin ...
in Morocco may have taken its name from the Berber name ''alili'' or ''oualilt'' for the flower.


Distribution and habitat

''Nerium oleander'' is either native or naturalized to a broad area spanning from Northwest Africa and Iberian Peninsula eastward through the
Mediterranean region In biogeography, the Mediterranean Basin (; also known as the Mediterranean Region or sometimes Mediterranea) is the region of lands around the Mediterranean Sea that have mostly a Mediterranean climate, with mild to cool, rainy winters and wa ...
, to the Arabian Peninsula, southern Asia, and as far east as
Yunnan Yunnan , () is a landlocked province in the southwest of the People's Republic of China. The province spans approximately and has a population of 48.3 million (as of 2018). The capital of the province is Kunming. The province borders the C ...
in southern parts of China.Pankhurst, R. (editor). ''Nerium oleander'' L. ''Flora Europaea''.
Royal Botanic Garden Edinburgh The Royal Botanic Garden Edinburgh (RBGE) is a scientific centre for the study of plants, their diversity and conservation, as well as a popular tourist attraction. Founded in 1670 as a physic garden to grow medicinal plants, today it occupies ...
. Retrieved on 2009-07-27.
Bingtao Li, Antony J. M. Leeuwenberg, and D. J. Middleton. "''Nerium oleander'' L.", ''Flora of China''.
Harvard University Harvard University is a private Ivy League research university in Cambridge, Massachusetts. Founded in 1636 as Harvard College and named for its first benefactor, the Puritan clergyman John Harvard, it is the oldest institution of high ...
. Retrieved on 2009-07-27.
INCHEM (2005). ''Nerium oleander'' L. (PIM 366). International Programme on Chemical Safety: INCHEM. Retrieved on 2009-07-27
/ref>Huxley, A.; Griffiths, M.; Levy, M. (eds.) (1992). ''The New RHS Dictionary of Gardening''. Macmillan. . It typically occurs around stream beds in river valleys, where it can alternatively tolerate long seasons of drought and inundation from winter rains. ''N. oleander'' is planted in many subtropical and tropical areas of the world. On the East Coast of the US, it grows as far north as
Virginia Beach Virginia Beach is an independent city located on the southeastern coast of the Commonwealth of Virginia in the United States. The population was 459,470 at the 2020 census. Although mostly suburban in character, it is the most populous city ...
, while in California and Texas miles of oleander shrubs are planted on
median strip The median strip, central reservation, roadway median, or traffic median is the reserved area that separates opposing lanes of traffic on divided roadways such as divided highways, dual carriageways, freeways, and motorways. The term also a ...
s. There are estimated to be 25 million oleanders planted along highways and roadsides throughout the state of California. Because of its durability, oleander was planted prolifically on
Galveston Island Galveston Island ( ) is a barrier island on the Texas Gulf Coast in the United States, about southeast of Houston. The entire island, with the exception of Jamaica Beach, is within the city limits of the City of Galveston in Galveston County. T ...
in Texas after the disastrous Hurricane of 1900. They are so prolific that Galveston is known as the 'Oleander City'; an annual oleander festival is hosted every spring.
Moody Gardens Moody Gardens is an educational tourist destination, with a golf course and hotel in Galveston, Texas which opened in 1986. The non-profit destination uses nature to educate and excite visitors about conservation and wildlife. Moody Gardens featu ...
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 An urban heat island (UHI) is an urban or metropolitan area that is significantly warmer than its surrounding rural areas due to human activities. The temperature difference is usually larger at night than during the day, and is most apparen ...
effect. This is also the case with North American cities in the
Pacific Northwest The Pacific Northwest (sometimes Cascadia, or simply abbreviated as PNW) is a geographic region in western North America bounded by its coastal waters of the Pacific Ocean to the west and, loosely, by the Rocky Mountains to the east. Tho ...
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 ''Daphnis nerii'', the oleander hawk-moth or army green moth, is a moth of the family Sphingidae. It was described by Carl Linnaeus in his 1758 10th edition of ''Systema Naturae''. Distribution ''Daphnis nerii'' is a large hawk-moth found in wi ...
'') 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 Pollination is the transfer of pollen from an anther of a plant to the stigma of a plant, later enabling fertilisation and the production of seeds, most often by an animal or by wind. Pollinating agents can be animals such as insects, birds, a ...
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

A bacterial disease known as ( ''Xylella fastidiosa'' subspecies ''sandyi'') has become an extremely serious threat to the shrub since it was first noticed in
Palm Springs Palm Springs (Cahuilla: ''Séc-he'') is a desert resort city in Riverside County, California, United States, within the Colorado Desert's Coachella Valley. The city covers approximately , making it the largest city in Riverside County by land ...
, California, in 1992. The disease has since decimated hundreds of thousands of shrubs mainly in
Southern California Southern California (commonly shortened to SoCal) is a geographic and cultural region that generally comprises the southern portion of the U.S. state of California. It includes the Los Angeles metropolitan area, the second most populous urban a ...
, but also on a smaller scale in
Arizona Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a state in the Southwestern United States. It is the 6th largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is part of the Fou ...
,
Nevada Nevada ( ; ) is a state in the Western region of the United States. It is bordered by Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. Nevada is the 7th-most extensive, ...
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 Xylem is one of the two types of transport tissue in vascular plants, the other being phloem. The basic function of xylem is to transport water from roots to stems and leaves, but it also transports nutrients. The word ''xylem'' is derived from ...
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. This malaise can continue for several years until the plant completely dies—there is no known cure. 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 In biology, a pathogen ( el, πάθος, "suffering", "passion" and , "producer of") in the oldest and broadest sense, is any organism or agent that can produce disease. A pathogen may also be referred to as an infectious agent, or simply a germ ...
was identified as the subspecies ''sandyi'' by Purcell ''et al.'', 1999.


Cultivation


History

''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 (
Ecclesiasticus The Book of Sirach () or Ecclesiasticus (; abbreviated Ecclus.) is a Jewish work, originally in Hebrew, of ethical teachings, from approximately 200 to 175 BC, written by the Judahite scribe Ben Sira of Jerusalem, on the inspiration of his fa ...
XXIV, 13) dating back to between 450 and 180 BC. The ancient Greeks had several names for the plant, including ''rhododaphne'', ''nerion'', ''rhododendron'' and ''rhodon''. Pliny confirmed that the Romans had no
Latin Latin (, or , ) is a classical language belonging to the Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through the power of the ...
word for the plant, but used the Greek terms instead.
Pedanius Dioscorides Pedanius Dioscorides ( grc-gre, Πεδάνιος Διοσκουρίδης, ; 40–90 AD), “the father of pharmacognosy”, was a Greek physician, pharmacologist, botanist, and author of '' De materia medica'' (, On Medical Material) —a 5-vo ...
states in his 1st century AD pharmacopeia ''
De Materia Medica (Latin name for the Greek work , , both meaning "On Medical Material") is a pharmacopoeia of medicinal plants and the medicines that can be obtained from them. The five-volume work was written between 50 and 70 CE by Pedanius Dioscorides, ...
'' that the Romans used the Greek ''rhododendron'' but also the Latin ''Oleander'' and ''Laurorosa''. The Egyptians apparently called it ''scinphe'', the North Africans ''rhodedaphane'', and the
Lucania Lucania was a historical region of Southern Italy. It was the land of the Lucani, an Oscan people. It extended from the Tyrrhenian Sea to the Gulf of Taranto. It bordered with Samnium and Campania in the north, Apulia in the east, and Bruttiu ...
ns (a southern Italic people) ''icmane''. Both Pliny and Dioscorides stated that oleander was an effective antidote to venomous snake bites if mixed with
rue ''Ruta graveolens'', commonly known as rue, common rue or herb-of-grace, is a species of ''Ruta'' grown as an ornamental plant and herb. It is native to the Balkan Peninsula. It is grown throughout the world in gardens, especially for its bluis ...
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 ''Perspectives in Biology and Medicine'' is a peer-reviewed academic journal established in 1957. It publishes essays that explore biology and medicine in relation to their place in society. Authors write informally, presenting their "perspectives" ...
'' posited that oleander was the substance used to induce hallucinations in the
Pythia Pythia (; grc, Πυθία ) was the name of the high priestess of the Temple of Apollo at Delphi. She specifically served as its oracle and was known as the Oracle of Delphi. Her title was also historically glossed in English as the Pythoness ...
, the female priestess of
Apollo Apollo, grc, Ἀπόλλωνος, Apóllōnos, label=genitive , ; , grc-dor, Ἀπέλλων, Apéllōn, ; grc, Ἀπείλων, Apeílōn, label= Arcadocypriot Greek, ; grc-aeo, Ἄπλουν, Áploun, la, Apollō, la, Apollinis, label ...
, 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 ''Laurus nobilis'' is an aromatic evergreen tree or large shrub with green, glabrous (smooth) leaves. It is in the flowering plant family Lauraceae. It is native to the Mediterranean region and is used as bay leaf for seasoning in cookin ...
that ancient authors cite. In his book ''Enquiries into Plants'' of circa 300 BC,
Theophrastus Theophrastus (; grc-gre, Θεόφραστος ; c. 371c. 287 BC), a Greek philosopher and the successor to Aristotle in the Peripatetic school. He was a native of Eresos in Lesbos.Gavin Hardy and Laurence Totelin, ''Ancient Botany'', Routle ...
described (among plants that affect the mind) a shrub he called ''onotheras'', which modern editors render oleander: "the root of ''onotheras'' leanderadministered in wine", he alleges, "makes the temper gentler and more cheerful".
The root of ''onotheras'' leanderadministered 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. 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 Prima Porta is the 58th ''Zones of Rome, zona'' of Rome, identified by the initials Z. LVIII. The name Prima Porta (First Door) came from an arch of the aqueduct that brought water to the Villa of Livia, which formed over Via Flaminia a sort of ga ...
outside Rome, and those from the House of the Wedding of Alexander and the Marine Venus in Pompeii.
Carbonized Carbonized were a Sweden, Swedish avant-garde metal band formed 1988 in Saltsjöbaden. The band was formed by Lars Rosenberg in 1988, with Dismember (band), Dismember vocalist Matti Kärki. Joined by drummer Piotr Wawrzeniuk, the trio was compl ...
fragments of oleander wood have been identified at the
Villa Poppaea The Villa Poppaea is an ancient luxurious Roman seaside villa (''villa maritima'') located in Torre Annunziata between Naples and Sorrento, in Southern Italy. It is also called the Villa Oplontis or Oplontis Villa A. as it was situated in the ...
in
Oplontis Oplontis is an ancient Roman archaeological site located in the town of Torre Annunziata, south of Naples in the Campania region of southern Italy. The excavated site comprises two Roman villas, the best-known of which is Villa A, the so-called ...
, likewise buried by the
eruption of Mount Vesuvius in 79 AD Of the many eruptions of Mount Vesuvius, a major stratovolcano in southern Italy, the best-known is its eruption in 79 AD, which was one of the deadliest in European history. The eruption of Mount Vesuvius in 79 AD is one of the best-known in ...
. They were found to have been planted in a decorative arrangement with
citron The citron (''Citrus medica''), historically cedrate, is a large fragrant citrus fruit with a thick rind. It is said to resemble a 'huge, rough lemon'. It is one of the original citrus fruits from which all other citrus types developed throu ...
trees (''Citrus medica'') alongside the villa's swimming pool.
Herbaria A herbarium (plural: herbaria) is a collection of preserved plant specimens and associated data used for scientific study. The specimens may be whole plants or plant parts; these will usually be in dried form mounted on a sheet of paper (called ...
of oleander varieties are compiled and held at the
Smithsonian Institution The Smithsonian Institution ( ), or simply the Smithsonian, is a group of museums and education and research centers, the largest such complex in the world, created by the U.S. government "for the increase and diffusion of knowledge". Founded ...
in Washington, D.C. and at
Moody Gardens Moody Gardens is an educational tourist destination, with a golf course and hotel in Galveston, Texas which opened in 1986. The non-profit destination uses nature to educate and excite visitors about conservation and wildlife. Moody Gardens featu ...
in Galveston, Texas.


Ornamental gardening

Oleander is a vigorous grower in warm subtropical regions, where it is extensively used as an
ornamental plant Ornamental plants or garden plants are plants that are primarily grown for their beauty but also for qualities such as scent or how they shape physical space. Many flowering plants and garden varieties tend to be specially bred cultivars that ...
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. Hardy versions like white, red and pink oleander will tolerate occasional light frost down to , 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. Unless they wish to harvest the seeds, many gardeners choose to prune away the seedpods that form on spent flower clusters, which are a drain on energy. Propagation can be made from cuttings, where they can readily root after being placed in water or in rich organic potting material, like compost. 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. Once they are dormant they require little light and only occasional watering. Placing them in a space with
central heating A central heating system provides warmth to a number of spaces within a building from one main source of heat. It is a component of heating, ventilation, and air conditioning (short: HVAC) systems, which can both cool and warm interior spaces. ...
and poor air flow can make them susceptible to a variety of pests –
aphids Aphids are small sap-sucking insects and members of the superfamily Aphidoidea. Common names include greenfly and blackfly, although individuals within a species can vary widely in color. The group includes the fluffy white woolly aphids. A t ...
,
mealybugs Mealybugs are insects in the family Pseudococcidae, unarmored scale insects found in moist, warm habitats. Many species are considered pests as they feed on plant juices of greenhouse plants, house plants and subtropical trees and also act as a ...
, oleander scale,
whitefly Whiteflies are Hemipterans that typically feed on the undersides of plant leaves. They comprise the family Aleyrodidae, the only family in the superfamily Aleyrodoidea. More than 1550 species have been described. Description and taxonomy The ...
and spider mites.


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 Salmon () is the common name for several commercially important species of euryhaline ray-finned fish from the family Salmonidae, which are native to tributaries of the North Atlantic (genus ''Salmo'') and North Pacific (genus '' Oncorhy ...
. 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 Variegation is the appearance of differently coloured zones in the leaves and sometimes the stems and fruit of plants. Species with variegated individuals are sometimes found in the understory of tropical rainforests, and this habitat is the s ...
form, 'Variegata', featuring leaves striped in yellow and white. 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 at maturity.


Toxicity

Oleander has historically been considered a
poisonous plant Plants that produce toxins are referred to as poisonous plants. Plants that cause irritation on contact are also described as "poisonous". The toxins in poisonous plants affect herbivores, and deter them from consuming the plants. Plants cannot ...
because some of its compounds may exhibit toxicity, especially to animals, when consumed in large amounts. Among these compounds are
oleandrin Oleandrin is a cardiac glycoside found in the poisonous plant oleander (''Nerium oleander'' L.). As a main phytochemical of oleander, oleandrin is associated with the toxicity of oleander sap, and has similar properties to digoxin. Oleander has ...
and oleandrigenin, known as
cardiac glycoside Cardiac glycosides are a class of organic compounds that increase the output force of the heart and decrease its rate of contractions by inhibiting the cellular sodium-potassium ATPase pump. Their beneficial medical uses are as treatments for c ...
s, which are known to have a narrow
therapeutic index The therapeutic index (TI; also referred to as therapeutic ratio) is a quantitative measurement of the relative safety of a drug. It is a comparison of the amount of a therapeutic agent that causes the therapeutic effect to the amount that causes ...
and can be toxic when ingested. Toxicity studies of animals administered oleander extract concluded that birds and rodents were observed to be relatively insensitive to 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". 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)." 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. A spokesman for the Los Angeles County Coroner's office stated that it was the first instance of death connected to oleander in the county, and a toxicologist from the California Poison Control Center said it was the first instance of death he had seen recorded. 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 gastrointestinal effects can consist of nausea and vomiting, excess salivation, abdominal pain,
diarrhea Diarrhea, also spelled diarrhoea, is the condition of having at least three loose, liquid, or watery bowel movements each day. It often lasts for a few days and can result in dehydration due to fluid loss. Signs of dehydration often begin w ...
that may contain blood, and especially in
horse The horse (''Equus ferus caballus'') is a domesticated, one-toed, hoofed mammal. It belongs to the taxonomic family Equidae and is one of two extant subspecies of ''Equus ferus''. The horse has evolved over the past 45 to 55 million yea ...
s,
colic Colic or cholic () is a form of pain that starts and stops abruptly. It occurs due to muscular contractions of a hollow tube (small and large intestine, gall bladder, ureter, etc.) in an attempt to relieve an obstruction by forcing content out. ...
. Cardiac reactions consist of irregular heart rate, sometimes characterized by a racing heart at first that then slows to below normal further along in the reaction. Extremities may become pale and cold due to poor or irregular circulation. The effect on the central nervous system may show itself in symptoms such as drowsiness, tremors or shaking of the muscles,
seizures An epileptic seizure, informally known as a seizure, is a period of symptoms due to abnormally excessive or synchronous neuronal activity in the brain. Outward effects vary from uncontrolled shaking movements involving much of the body with l ...
, collapse, and even coma that can lead to death. 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.


Treatment

Poisoning and reactions to oleander plants are evident quickly, requiring immediate medical care in suspected or known poisonings of both humans and animals. Induced vomiting and
gastric lavage Gastric lavage, also commonly called stomach pumping or gastric irrigation, is the process of cleaning out the contents of the stomach. Since its first recorded use in early 19th century, it has become one of the most routine means of eliminating ...
are protective measures to reduce absorption of the toxic compounds. Activated carbon may also be administered to help absorb any remaining toxins. 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. Digoxin immune fab is the best way to cure an oleander poisoning if inducing vomiting has no or minimal success, although it is usually used only for life-threatening conditions due to side effects. Drying of plant materials does not eliminate the toxins. It is also hazardous for animals such as
sheep Sheep or domestic sheep (''Ovis aries'') are domesticated, ruminant mammals typically kept as livestock. Although the term ''sheep'' can apply to other species in the genus '' Ovis'', in everyday usage it almost always refers to domesticated ...
,
horse The horse (''Equus ferus caballus'') is a domesticated, one-toed, hoofed mammal. It belongs to the taxonomic family Equidae and is one of two extant subspecies of ''Equus ferus''. The horse has evolved over the past 45 to 55 million yea ...
s,
cattle Cattle (''Bos taurus'') are large, domesticated, cloven-hooved, herbivores. They are a prominent modern member of the subfamily Bovinae and the most widespread species of the genus ''Bos''. Adult females are referred to as cows and adult ma ...
, 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. 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 ''Adenium obesum'' is a poisonous species of flowering plant belonging to the tribe Nerieae of the subfamily Apocynoideae of the dogbane family, Apocynaceae. It is native to the Sahel regions south of the Sahara (from Mauritania and Senegal to ...
'') 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 Pythia (; grc, Πυθία ) was the name of the high priestess of the Temple of Apollo at Delphi. She specifically served as its oracle and was known as the Oracle of Delphi. Her title was also historically glossed in English as the Pythoness ...
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 Plutarch (; grc-gre, Πλούταρχος, ''Ploútarchos''; ; – after AD 119) was a Greek Middle Platonist philosopher, historian, biographer, essayist, and priest at the Temple of Apollo in Delphi. He is known primarily for hi ...
and
Democritus Democritus (; el, Δημόκριτος, ''Dēmókritos'', meaning "chosen of the people"; – ) was an Ancient Greek pre-Socratic philosopher from Abdera, primarily remembered today for his formulation of an atomic theory of the universe. No ...
report align with results of oleander poisoning. Harissis also provides evidence claiming that the word laurel may of been used to describe an oleander leaf.


Folklore

The toxicity of the plant makes it the center of an
urban legend An urban legend (sometimes contemporary legend, modern legend, urban myth, or urban tale) is a genre of folklore comprising stories or fallacious claims circulated as true, especially as having happened to a "friend of a friend" or a family m ...
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 dog A hot dog (uncommonly spelled hotdog) is a food consisting of a grilled or steamed sausage served in the slit of a partially sliced bun. The term hot dog can refer to the sausage itself. The sausage used is a wiener ( Vienna sausage) or a f ...
s or other food roasted over a campfire using oleander sticks. Some variants tell of this happening to
Napoleon Napoleon Bonaparte ; it, Napoleone Bonaparte, ; co, Napulione Buonaparte. (born Napoleone Buonaparte; 15 August 1769 – 5 May 1821), later known by his regnal name Napoleon I, was a French military commander and political leader who ...
's or
Alexander the Great Alexander III of Macedon ( grc, Ἀλέξανδρος, Alexandros; 20/21 July 356 BC – 10/11 June 323 BC), commonly known as Alexander the Great, was a king of the ancient Greek kingdom of Macedon. He succeeded his father Philip II to ...
's soldiers. There is an ancient account mentioned by
Pliny the Elder Gaius Plinius Secundus (AD 23/2479), called Pliny the Elder (), was a Roman author, naturalist and natural philosopher, and naval and army commander of the early Roman Empire, and a friend of the emperor Vespasian. He wrote the encyclopedic ' ...
in his '' Natural History'', who described a region in
Pontus Pontus or Pontos may refer to: * Short Latin name for the Pontus Euxinus, the Greek name for the Black Sea (aka the Euxine sea) * Pontus (mythology), a sea god in Greek mythology * Pontus (region), on the southern coast of the Black Sea, in modern ...
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, but oleander flowers are nectarless and therefore cannot transmit any toxins via nectar. The actual flower referenced by Pliny was either Azalea or '' Rhododendron'', which is still used in Turkey to produce a hallucinogenic honey. 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

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 Vincent Willem van Gogh (; 30 March 185329 July 1890) was a Dutch Post-Impressionist painter who posthumously became one of the most famous and influential figures in Western art history. In a decade, he created about 2,100 artworks, inc ...
painted his famous "Oleanders" in
Arles Arles (, , ; oc, label= Provençal, Arle ; Classical la, Arelate) is a coastal city and commune in the South of France, a subprefecture in the Bouches-du-Rhône department of the Provence-Alpes-Côte d'Azur region, in the former province of ...
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 Sir Lawrence Alma-Tadema, (; born Lourens Alma Tadema ; 8 January 1836 – 25 June 1912) was a Dutch painter who later settled in the United Kingdom becoming the last officially recognised denizen in 1873. Born in Dronryp, the Netherlands, ...
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 Janet Fitch (born November 9, 1955) is an American author. She wrote the novel '' White Oleander'', which became a film in 2002. She is a graduate of Reed College. Fitch was born in Los Angeles, a third-generation native, and grew up in a fa ...
's 1999 novel ''
White Oleander ''White Oleander'' is a 1999 novel by American author Janet Fitch. It is a coming-of-age story about a child (Astrid) who is separated from her mother (Ingrid) and placed in a series of foster homes. It deals with themes of motherhood. The book ...
'' 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 Alison Marion Lohman (born September 18, 1979) is an American former actress. Born in Palm Springs, California, she began her career with small roles in short and independent films. Lohman headlined the drama film '' White Oleander'' (2002), wh ...
. * In the 17th century AD
Farsi Persian (), also known by its endonym Farsi (, ', ), is a Western Iranian language belonging to the Iranian branch of the Indo-Iranian subdivision of the Indo-European languages. Persian is a pluricentric language predominantly spoken an ...
-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 toxic 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, Cultivated,
Galveston Galveston ( ) is a coastal resort city and port off the Southeast Texas coast on Galveston Island and Pelican Island in the U.S. state of Texas. The community of , with a population of 47,743 in 2010, is the county seat of surrounding Ga ...
, alt=Unusual yellow-flowered variety. Cultivated,
Galveston Galveston ( ) is a coastal resort city and port off the Southeast Texas coast on Galveston Island and Pelican Island in the U.S. state of Texas. The community of , with a population of 47,743 in 2010, is the county seat of surrounding Ga ...
File:Original Oleander Planting in Galveston.jpg, First oleander planted in
Galveston Galveston ( ) is a coastal resort city and port off the Southeast Texas coast on Galveston Island and Pelican Island in the U.S. state of Texas. The community of , with a population of 47,743 in 2010, is the county seat of surrounding Ga ...
(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, ''N. oleander'' in
West Bengal West Bengal (, Bengali: ''Poshchim Bongo'', , abbr. WB) is a state in the eastern portion of India. It is situated along the Bay of Bengal, along with a population of over 91 million inhabitants within an area of . West Bengal is the fou ...
, alt=Flowers of ''N. oleander'' in
West Bengal West Bengal (, Bengali: ''Poshchim Bongo'', , abbr. WB) is a state in the eastern portion of India. It is situated along the Bay of Bengal, along with a population of over 91 million inhabitants within an area of . West Bengal is the fou ...


See also

* '' Cascabela thevetia'' (yellow oleander) *
List of ineffective cancer treatments This is a non-exhaustive list of alternative treatments that have been promoted to treat or prevent cancer in humans but which lack scientific and medical evidence of effectiveness. In many cases, there is scientific evidence that the alleged tr ...
*
List of plants poisonous to equines Many plants are poisonous to equines; the species vary depending on location, climate, and grazing conditions. In many cases, entire genera are poisonous to equines and include many species spread over several continents. Plants can cause reactio ...
*
List of poisonous plants Plants that produce toxins are referred to as poisonous plants. Plants that cause irritation on contact are also described as "poisonous". The toxins in poisonous plants affect herbivores, and deter them from consuming the plants. Plants cannot ...
* Tibesti-Jebel Uweinat montane xeric woodlands


Notes


References


External links


Oleander Facts
Clemson University Clemson University () is a public land-grant research university in Clemson, South Carolina. Founded in 1889, Clemson is the second-largest university in the student population in South Carolina. For the fall 2019 semester, the university enr ...
. Retrieved on 2018-03-26.
Information on Oleander toxicity
International Oleander Society. Retrieved on 2009-07-27.
Plants of North Africa
Barcelona Botanic Gardens 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 The Institute of Tropical Medicine ( nl, Instituut voor Tropische Geneeskunde, ITG; french: Institut de médecine tropicale, or IMT), officially known as Prince Leopold Institute of Tropical Medicine, is one of the world's leading institutes for ...
. Retrieved on 2009-07-27.
Cardiac glycosides
Desai, Umesh R.
Virginia Commonwealth University Virginia Commonwealth University (VCU) is a public research university in Richmond, Virginia. VCU was founded in 1838 as the medical department of Hampden–Sydney College, becoming the Medical College of Virginia in 1854. In 1968, the Virginia ...
. School of Pharmacy. Retrieved on 2009-07-27.
Legend of Oleander-poisoning at Campfire
Snopes ''Snopes'' , formerly known as the ''Urban Legends Reference Pages'', is a fact-checking website. It has been described as a "well-regarded reference for sorting out myths and rumors" on the Internet. The site has also been seen as a source f ...
. Retrieved on 2009-07-27.
Distribution over the world
''N. oleander'',
University of Helsinki The University of Helsinki ( fi, Helsingin yliopisto, sv, Helsingfors universitet, abbreviated UH) is a public research university located in Helsinki, Finland since 1829, but founded in the city of Turku (in Swedish ''Åbo'') in 1640 as the ...
{{Taxonbar, from1=Q3874774, from2=Q155833 Monotypic Apocynaceae genera Drought-tolerant trees Flora of North Africa Flora of Western Asia Garden plants of Africa Garden plants of Asia Medicinal plants Ornamental trees Shrubs Nerieae Flora of Lebanon Poisonous plants Flora of the Mediterranean Basin