Conium maculatum

Last updated

Conium maculatum
Conium.jpg
Status TNC G5.svg
Secure  (NatureServe)
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Apiales
Family: Apiaceae
Genus: Conium
Species:
C. maculatum
Binomial name
Conium maculatum
L.
Synonyms [1]
List
    • Cicuta major
    • Cicuta officinalis
    • Conium ceretanum
    • Conium cicuta
    • Conium croaticum
    • Conium leiocarpum
    • Conium maculosum
    • Conium nodosum
    • Conium pyrenaicum
    • Conium sibiricum
    • Conium strictum
    • Conium tenuifolium
    • Coriandrum cicuta
    • Coriandrum maculatum
    • Selinum conium
    • Sium conium

Conium maculatum, commonly known as hemlock (British English) or poison hemlock (in North America), is a highly poisonous flowering plant in the carrot family Apiaceae.

Contents

The plant is herbaceous, with no woody parts, and has a biennial lifecycle. Under the right conditions, the plant grows quite rapidly during the growing season, and can reach heights of 2.4 metres (8 feet), with a long penetrating root. The plant has a distinctive odour that is usually considered unpleasant and carries with the wind. The hollow stems are usually spotted dark maroon and turn dry and brown after the plant completes its biennial lifecycle.

Native to Europe and North Africa, hemlock is a hardy plant capable of living in a variety of environments and is now widely naturalised in locations outside its native range, including parts of Australia, West Asia, and North and South America, to which it has been introduced. It is capable of spreading and thereby becoming an invasive weed.

All parts of the plant are toxic, particularly the seeds and roots, and especially when ingested. Hemlock is well-known as the poison that killed the philosopher Socrates after his trial in Ancient Greece.

Description

Conium maculatum is a herbaceous flowering plant that typically grows as a biennial, but can grow as a perennial on occasion. [2] The second year stems topped with flowers grow to between 0.5 and 3 m (1.6 and 9.8 ft) in height; [3] they are coarse and branch frequently. [4] Stems are hollow except at the joints where the leaves are attached, and are generally spotted or streaked with purple. [2] [5] In the first year of growth, the plant has no stems and produces a large rosette of leaves. [2] All parts of the plant are glabrous, lacking hairs, but sometimes they will have a small amount of blue-grey natural waxes on lower parts of the plant. [6]

The leaves are one- to three-pinnate,finely divided and lacy, with leaves lower down on the plant two or more pinnate while the upper leaves are just single pinnate and often only partly divided. The lower leaves are larger than those higher up. [3] They are broad with an overall triangular shape, some 30 to 60 cm (12 to 24 in) in length. [6] The leaflets are attached in pairs on opposite sides of the central veins. [4]

The poison hemlock's flowers are small and white; each flower has five petals. [7] The flowers are in umbrella shaped clusers called umbels. [3]

Similar species

The wild carrot, Daucus carota, is often confused with poison hemlock. Daucus carota Marchew zwyczajna 2023-07-23 Soltysowice 02.jpg
The wild carrot, Daucus carota , is often confused with poison hemlock.

Hemlock can be confused with the wild carrot plant ( Daucus carota ). Wild carrot has a hairy stem without purple markings, and grows less than 1 m (3+12 ft) tall. [8] One can distinguish the two from each other by hemlock's smooth texture, vivid mid-green colour, purple spotting of stems and petioles, and flowering stems reaching a typical height being at least 1.5 m (5 ft)—twice the maximum for wild carrot. Wild carrots have hairy stems that lack the purple blotches. [9] [10] The species can also be confused with harmless cow parsley ( Anthriscus sylvestris ), [2] [11] and water hemlock ( Cicuta ). [11]

Taxonomy

The generic name Conium comes from the Ancient Greek κώνειον kṓneion: "hemlock". This may be related to konas (meaning to whirl), in reference to vertigo, one of the symptoms of ingesting the plant. [12]

C. maculatum was the first species within the genus Conium to be described. It was identified by Carl Linnaeus in his 1753 publication, Species Plantarum . Maculatum means 'spotted', in reference to the purple blotches on the stalks of the species. [13]

Conium maculatum has 23 synonyms, 16 of them species, according to Plants of the World Online. [1]

Table of Synonyms [1]
NameYearRankNotes
Cicuta majorLam.1779species≡ hom., nom. superfl.
Cicuta officinalisCrantz1767species≡ hom.
Conium ceretanumSennen1926species= het.
Conium cicuta(Crantz) Neck.1768species≡ hom.
Conium croaticumWaldst. & Kit. ex Willd.1809species= het.
Conium leiocarpum(Boiss.) Stapf1886species= het.
Conium maculatum var. barceloiO.Bolòs & Vigo1974variety= het.
Conium maculatum subsp. croaticum(Waldst. & Kit. ex Willd.) Drude1898subspecies= het.
Conium maculatum var. immaculatumSchur1866variety= het.
Conium maculatum subsp. leiocarpum(Boiss.) Drude1898subspecies= het.
Conium maculatum var. leiocarpumBoiss.1872variety= het.
Conium maculatum subsp. viride(DC.) Espeut2002subspecies= het.
Conium maculatum var. virideDC.1830variety= het.
Conium maculosumPall.1771species= het.
Conium nodosumFisch. ex Steud.1821species= het., not validly publ.
Conium pyrenaicumSennen & Elías1928species= het.
Conium sibiricumSteud.1840species= het., not validly publ.
Conium strictumTratt.1811species= het.
Conium tenuifoliumMill.1768species= het.
Coriandrum cicutaCrantz1762species≡ hom., nom. superfl.
Coriandrum maculatum(L.) Roth1788species≡ hom.
Selinum conium(Vest) E.H.L.Krause1904species= het.
Sium coniumVest1805species= het.
Notes: ≡ homotypic synonym  ;=heterotypic synonym

Names

In British, Australian, and New Zealand English the most prominent vernacular name is hemlock. [14] [15] [7] This name is derived from the Old English words hymlice, hymlic, or hemlic likely referring to Conium. More certainly in the 1500s it referred to Conium maculatum and was used in herbalist texts. It entered Middle English as hemeluc, hemlok, hemlake, hemlocke, hemloc, or hemblock. In this period it was first spelled as hemlock by William Shakespeare in Henry V in 1623. [16] Combined with qualifying words it is used for other species, for example bastard hemlock for Anthriscus sylvestris and as eastern hemlock for Tsuga canadensis . [16] [17] For other uses see Hemlock.

In American and Canadian English, [18] [19] it is typically called poison hemlock, though this name is also used elsewhere. [15] This usage dates to 1757. [20] Less frequent names used in both America and Australia include spotted hemlock and poison parsley. [21] [15] Other local or infrequent names in the US include: bunk, California-fern, cashes, herb-bonnet, kill-cow, Nebraska-fern, poisonroot, poison-snakeweed, St. Bennet's-herb, snakeweed, stinkweed, and wode-whistle. [21] In Australia, it is occasionally called wild carrot or wild parsnip. [15] In Canada is it is also known as common poison-hemlock, deadly hemlock, fool's-parsley, spotted parsley, and spotted-hemlock. [19]

Distribution and habitat

The hemlock plant is native to Europe, Central Asia, and the Mediterranean region. [22] It occurs in many British Isles counties, [23] including in Northern Ireland. [24] It has become naturalised in Asia, North America, Australia, and New Zealand. [25] [26] [15] It is sometimes encountered around rivers in southeast Australia and Tasmania where it has been considered an invasive species. [27] Infestations and human contact with the plant are sometimes newsworthy events in the U.S. due to its toxicity. [28] [29]

Ecology

Agonopterix alstromeriana moth; its larva feeds on hemlock plants. Agonopterix alstromeriana, Aberdovey, North Wales, July 2006 (20191381660).jpg
Agonopterix alstromeriana moth; its larva feeds on hemlock plants.

The plant is often found in poorly drained soil, particularly near streams, ditches, and other watery surfaces. It grows on roadsides, at the edges of cultivated fields and in waste areas. [25] It grows in quite damp soil, [14] but also on drier rough grassland, roadsides, and disturbed ground. It is used as a food plant by the larvae of some Lepidoptera, including silver-ground carpet moths and the poison hemlock moth ( Agonopterix alstroemeriana ). The latter has been widely used as a biological control agent for the plant. [30]

Toxicity

All parts of the plant are poisonous. [18] The hollow stems remain deadly for up to three years after the plant has died. [31]

Hemlock contains coniine and some similar poisonous alkaloids, and is poisonous to all mammals (and many other organisms) that ingest it. Intoxication has been reported in cattle, pigs, sheep, goats, donkeys, rabbits, and horses. Ingesting more than 150–300 milligrams of coniine, approximately equivalent to six to eight hemlock leaves, can be fatal for adult humans. [32] Farmers need to ensure that the hay fed to their animals does not contain hemlock. Hemlock is at its most poisonous in the spring when the concentration of γ-coniceine (the precursor to other toxins) is at its peak. [33] [34]

Alkaloids

Chemical structure of one of the two enantiomers, the (S)-(+) isomer, of coniine, where natural mixtures are considered likely racemates (equal mixtures) of this and the (R)-(-) isomer. (S)-Coniine Structural Formula V.1.svg
Chemical structure of one of the two enantiomers, the (S)-(+) isomer, of coniine, where natural mixtures are considered likely racemates (equal mixtures) of this and the (R)-(–) isomer.

The major alkaloid found in flower buds is γ-coniceine. This molecule is transformed into coniine during the later stages of fruit development. [36] Seedlings have lower amounts of alkaloids overall and mainly γ-coniceine. [37] The alkaloids are volatile; as such, researchers assume that these alkaloids play an important role in attracting pollinators, such as butterflies and bees. [38]

Conium contains the piperidine alkaloids coniine, N-methylconiine, conhydrine, pseudoconhydrine, and gamma-coniceine (or g-coniceïne), which is the precursor of the other hemlock alkaloids. [25] [39] [37] [40]

Toxicology

Coniine has pharmacological properties and a chemical structure similar to nicotine. [25] [41] Coniine acts directly on the central nervous system through inhibitory action on nicotinic acetylcholine receptors. Coniine can be dangerous to humans and livestock, [37] and with its high potency, the ingestion of seemingly small doses can easily result in respiratory collapse and death. [42]

The alkaloid content in C. maculatum affects the thermoregulatory centre by a phenomenon called peripheral vasoconstriction, resulting in hypothermia in calves. [43] In addition, the alkaloid content stimulates the sympathetic ganglia and reduces the influence of the parasympathetic ganglia in rats and rabbits, causing an increased heart rate. [44]

Coniine has significant toxic effects on the kidneys. The presence of rhabdomyolysis and acute tubular necrosis has been demonstrated in patients who died from hemlock poisoning. Some of these patients had acute kidney injury. [45] Coniine is toxic for the kidneys because it leads to the constriction of the urinary bladder sphincter, eventually resulting in the accumulation of urine. [46]

Shortly after ingestion, the alkaloids induce neuromuscular dysfunction that is potentially fatal due to failure of the respiratory muscles. Acute toxicity, if not lethal, may be followed by spontaneous recovery, provided further exposure is avoided. Death can be prevented by artificial ventilation until the effects wear off after 48–72 hours. [25] For an adult, the ingestion of more than 100 mg (0.1 gram) of coniine (about six to eight fresh leaves, or a smaller dose of the seeds or root) may be fatal. Narcosis-like effects can be observed as soon as 30 minutes after ingestion of green leaves of the plant, with victims falling asleep and gradually becoming unconscious until death occurs a few hours later. [47] The onset of symptoms is similar to that caused by curare, with an ascending muscular paralysis leading to paralysis of the respiratory muscles and ultimately death by oxygen deprivation. [48]

As there is no specific antidote, prevention is the only way to deal with agricultural production losses caused by the plant. The use of herbicides and grazing with less-susceptible animals (such as sheep) have been suggested as control methods. Contrary to popular belief, scientific studies have disproven the claim that the plant's alkaloids can enter the human food chain via milk and fowl. [49]

In culture

Ancient Greece

The Death of Socrates, by Jacques-Louis David (1787) David - The Death of Socrates.jpg
The Death of Socrates , by Jacques-Louis David (1787)

In ancient Greece, hemlock was used to poison condemned prisoners. Conium maculatum is the plant that killed Theramenes, Socrates, Polemarchus, and Phocion. [50] Socrates, the most famous victim of hemlock poisoning, was sentenced to death at his trial; he took an infusion of hemlock. [51]

Uses

In high mountain areas of Georgia, hemlock leaves were used as a spring food after long winters. It required careful cooking, often in several changes of water. Other poisonous leaves used in this fashion included cow parsnips (Heracleum species), potatoes, and lilies. Locals speaking to ethnobotanical researchers were well aware of the poisonous nature of the plants and reported the practice to have largely died out with greater availability of cultivated foods in markets and roads allowing easier access to them during all seasons. [52]

It was also used as a medicine in ancient times, though great care was required due to its toxic properties. In Europe during the Medieval Period it was only administered as a remedy for "the bite of mad dogge" in wine together with betony and fennel seed. Later uses included as final, desperate attempt to cure virulent poisons such as strychnine. In the 1400s and 1500s European monks roasted the root and applied it externally to the feet, hands, and wrists for pain from gout. [53] From 1864 to 1898 hemlock was officially listed as a medicine in the London and Edinburgh pharmacopoeias. The last listing of it was removed from British Pharmaceutical Code in 1934. A wide range of potency for identical preparations is likely to have contributed to the discontinuation of its use as a medicine. [54]

See also

References

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