Conium
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{{Taxobox
| name = ''Conium''
| image = Conium.jpg
| image_width = 240px
| image_caption = ''Conium maculatum''
| regnum = [[Plantae]]
| divisio = [[Flowering plant|Magnoliophyta]]
| classis = [[Magnoliopsida]]
| ordo = [[Apiales]]
| familia = [[Apiaceae]]
| subfamilia = [[Apioideae]]
| genus = '''''Conium'''''
| genus_authority = [[Carolus Linnaeus|L.]]
| subdivision_ranks = Species
| subdivision =
''Conium chaerophylloides'' ([[Thunb.]]) [[Sond.]]<br/>
''Conium maculatum'' L.
}}
:''Poison hemlock redirects here. For other uses of "hemlock", see [[Hemlock]].''
'''''Conium''''' is a [[genus]] of two species of highly [[poisonous]] [[Perennial plant|perennial]] [[herbaceous]] [[flowering plant]]s in the family [[Apiaceae]], native to [[Europe]] and the [[Mediterranean region]] (''C. maculatum''), and to southern [[Africa]] (''C. chaerophylloides'').
By far the most familiar species is '''''Conium maculatum''''' ('''Hemlock''' or '''Poison Hemlock'''), the most common of several species of [[hemlock]] noted for their [[toxic]]ity. It is a [[herbaceous]] [[biennial plant]] which grows between 1.5–2.5 m tall, with a smooth green stem, usually spotted or streaked with red or purple on the lower half of the stem. The [[leaf|leaves]] are finely divided and lacy, overall triangular in shape, up to 50 cm long and 40 cm broad. The [[flower]]s are small, white, clustered in [[umbel]]s up to 10–15 cm across. The plant is often mistaken for [[fennel]], [[parsley]] or [[wild carrot]] although the characteristic stem hairs of the wild carrots are missing. The Conium root is fleshy, white and often unbranched and can be mistaken for [[parsnip]]. When crushed, the leaves and root emit a rank, unpleasant odour often compared to that of [[parsnip]]s.
Conium contains the [[alkaloid]]s [[coniine]], [[N-methylconiine]], [[conhydrine]], [[pseudoconhydrine]], [[g-coniceïne]] and [[atropine]].
The most important and toxic of these is coniine. Coniine is a [[neurotoxin]], which disrupts the workings of the [[peripheral nervous system]] and is toxic to [[human|people]] and all classes of [[livestock]]. Coniine causes death by blocking the [[neuromuscular junction]] in a manner similar to [[curare]]; this results in an ascending muscular paralysis with eventually paralysis of the respiratory muscles which results in death due to lack of oxygen to the heart and brain. Death can easily be prevented by artificial [[ventilation]] until the effects have worn off 48-72 hours later. Ingestion of Poison Hemlock ''' ''in any quantity'' ''' can result in respiratory collapse and death. <ref>Edible and Medicinal plants of the West, Gregory L. Tilford, ISBN 0-87842-359-1.</ref> For an adult the ingestion of more than 100mg of coniine (approximately 6 to 8 fresh leaves, or a smaller dose of the seeds or root), may result in fatality. <ref>[http://www.inchem.org/documents/pims/plant/conium.htm IPCS (International Programme on Chemical Safety)]</ref>
==Distribution and Identification==
{{Citations missing|date=July 2008}}
[[Image:Koeh-191.jpg|thumb|left|19th century illustration of ''Conium maculatum'']]
''Conium maculatum'' has been introduced and naturalised in many other areas, including much of [[Asia]], [[North America]] and [[Australia]]. Poison hemlock is often found on poorly drained soils, particularly near streams, ditches, and other surface water. Often referred to by children in south east Ireland as 'Devil's Porridge.'
In the Mountain West of North America, poison hemlock has become well established and invasive, and can be found in remote mountain areas anywhere water is present or soils are persistently moist. It is often found growing in the same habitat and side by side with [[Osha]] and ''[[Lomatium]]'' species, useful medicinal relatives in the [[Parsley]] family which Hemlock closely resembles, and can be very difficult to distinguish from ''Lomatium'' (an important historical food plant of Native Americans known as ''Biscuit Root'').
Hemlock's distinguishing characteristics are it requires a more consistent supply of water than ''Lomatium'' or Osha, and ''Lomatium'' species tend to prefer dry rocky soils devoid of organic material. ''Lomatium'' roots have a delicate rice-like odor, unlike the musty odor of Hemlock, with finely divided, hairlike leaves in most ''Lomatium'' species. ''Lomatium'' species tend to produce yellow flowers, but some species are white flowered and closely resemble Poison Hemlock. If the plant is growing on a hillside in dry, mineral soil far away from a source of water and has umbells of yellow flowers, its likely a ''Lomatium''. It the plant is growing in an area near water in consistently moist soil, is tall (0.75-2m), has purple splotches on the main stem, and is heavily branched with small umbels of white flowers, it is probably Hemlock and should be avoided.
[[Osha]] does not do well in overly moist soils since it is a species dependent on mycorrhizal fungi to survive, but there are areas where Osha and Poison Hemlock can be found only a few feet from each other. Poison Hemlock lacks the "spicy celery" odor of Osha, and is easily distinguished from it due to the absence of hairlike dead leaf material present on the root crown of Osha roots. Poison Hemlock roots in many cases have no discernible odor, and are typically heavily branched rather than carrot-like, but this is not always the case. The plants themselves smell musty or "mousy", and in most instances will have purple blotches or shading on the lower stem of the plant if the plant is fairly mature, but again, this is not always the case.
A useful trick to determine whether a plant is poison hemlock rather than [[fennel]], which it resembles, is to crush some leaves and smell the result. Fennel smells like [[anise]] or [[liquorice]], whereas the smell of poison hemlock is often described as mouse-like or musty. Considering the high toxicity of poison hemlock, if the plant cannot be identified it must be discarded. Coniine can be absorbed through the skin, and it is well advised to wash your hands immediately after handling this plant and avoid touching your eyes or mouth if you have recently handled or come into contact with Poison Hemlock, or if you have crushed the leaves of this plant in your hand to perform a "smell test".
''Conium'' is used as a food plant by the [[larva]]e of some [[Lepidoptera]] species including [[Silver-ground Carpet]].
Poison hemlock flourishes in the spring, when most other forage is gone. All plant parts are poisonous but once the plant is dried, the poison is greatly reduced, however not gone completely. Hemlock is also known as "poison parsley" or "spotted parsley".
Poison hemlock is sometimes confused with [[Cicuta|water hemlocks]] in the related genus ''[[Cicuta]]'', but are readily distinguished by the less finely divided leaves of the latter; the leaf veins of poison hemlock also run through the tips of the teeth, but those of the water hemlock run through the notches in between the teeth. The poison hemlock's root is long, white, and fleshy and is usually stringy and heavily branched, but can be carrot-like and unbranched in younger specimens of ''Conium''. Water hemlock's roots are made up of several tubers, and are typically chambered, and excude a yellow, rank, highly toxic sap that contains [[cicutoxin]].
== Socrates==
{{mainarticle|Trial of Socrates}}
In ancient Greece, hemlock was used to poison condemned prisoners. The most famous victim of hemlock poisoning is the philosopher [[Socrates]]. After being condemned to death for [[impiety]] in [[399 BC]], Socrates was given a potent [[solution]] of the hemlock plant. [[Plato]] described Socrates' death in the ''[[Phaedo]]'' <ref>[http://perseus.mpiwg-berlin.mpg.de/cgi-bin/ptext?lookup=Plat.+Phaedo+117e Plato, Euthyphro, Apology, Crito, Phaedo<!-- Bot generated title -->]</ref>:
:"The man … laid his hands on him and after a while examined his feet and legs, then pinched his foot hard and asked if he felt it. He said ‘No’; then after that, his thighs; and passing upwards in this way he showed us that he was growing cold and rigid. And then again he touched him and said that when it reached his heart, he would be gone. The chill had now reached the region about the groin, and uncovering his face, which had been covered, he said — and these were his last words — 'Crito, we owe a cock to [[Asclepius]]. Pay it and do not neglect it.' 'That,' said Crito, 'shall be done; but see if you have anything else to say.' To this question he made no reply, but after a little while he moved; the attendant uncovered him; his eyes were fixed. And Crito when he saw it, closed his mouth and eyes."<ref>Plato, Phaedo 117e–118a, trans. Loeb Classical Library, Harvard University Press, Cambridge, Mass., 1990 edition, pp. 401–3.</ref>
Although many have questioned whether this is a factual account, careful attention to Plato's words, modern and ancient medicine, and other ancient Greek sources point to the above account being consistent with ''Conium'' poisoning.<ref>{{cite journal | url=http://www.nd.edu/~plato/bloch.htm | journal=Journal of the International Plato Society | author=Bloch, Enid | title=Hemlock Poisoning and the Death of Socrates: Did Plato Tell the Truth? | issue=1 |date=March 2001}} A version of this article was also printed in {{cite book | title=The Trial and Execution of Socrates: Sources and Controversies | author=Thomas C. Brickhouse (Editor), Nicholas D. Smith (Editor) | isbn=978-0195119800 | year=2001}}</ref>
Sometimes the characteristic red spots found on the stem and branches are referred to as "the blood of Socrates" in reference to his death.{{Fact|date=March 2008}}
== Medicinal uses ==
Poison hemlock has been used as a sedative and for its antispasmodic properties. {{Fact|date=May 2008}} It was also used by [[Greeks|Greek]] and [[Persians|Persian]] physicians for a variety of problems, such as [[arthritis]]. {{Fact|date=May 2008}} However, it wasn't always effective, as the difference between a therapeutic and a [[toxic]] amount is very slight. Overdoses can produce [[paralysis]] and loss of speech being followed by depression of the [[Respiratory system|respiratory function]] and then [[death]].
==References and external links==
{{Commons|Conium maculatum}}
<references/>
*[http://www.ars-grin.gov/cgi-bin/npgs/html/splist.pl?2878 Germplasm Resources Information Network: ''Conium'']
*[http://rbg-web2.rbge.org.uk/cgi-bin/nph-readbtree.pl/feout?FAMILY_XREF=&GENUS_XREF=Conium&SPECIES_XREF=&TAXON_NAME_XREF=&RANK= Flora Europaea: ''Conium'']
* Edible and Medicinal plants of the West, Gregory L. Tilford, ISBN 0-87842-359-1
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[[Category:Apiaceae]]
[[Category:Poisonous plants]]
[[Category:Flora of California]]
[[roa-rup:Conium maculatum]]
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[[da:Skarntyde]]
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[[es:Conium maculatum]]
[[fa:شوکران]]
[[fr:Grande ciguë]]
[[gl:Cicuta]]
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[[ka:კონიო]]
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[[nrm:Conium maculatum]]
[[pl:Szczwół plamisty]]
[[pt:Cicuta]]
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[[uk:Болиголов плямистий]]