water hemlock


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Related to water hemlock: water parsnip

water hemlock:

see poison hemlockpoison hemlock,
lethally poisonous herbaceous plant (Conium maculatum) of the family Umbelliferae (parsley family). It has rank, finely divided foliage, flat-topped clusters of small white flowers, and a hollow, purple-mottled stem.
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Water Hemlock

 

(Cicuta), a genus of plants of the family Umbelliferae. Perennial water or marsh grasses with double or quadruple pinnate leaves. Small white blossoms, gathered into compound umbels. Fruit mostly rounded with mericarps slightly compressed on the sides. About ten (by other data, up to 20) species, mainly in North America.

In the USSR, the Eurasian species, C. virosa, is widespread: stalk hollow, height 50-150 cm; leaves double or triple pinnate; vertical rhizome divided into chambers by septa. The plant grows in marshes, on wet meadows, in alder thickets, and along swamped banks of rivers, lakes, and ditches. This is one of the most poisonous plants of the flora of the USSR. Especially dangerous are the rhizome and roots, which contain the poisonous substance cicutoxin. Domestic animals (chiefly cattle and sheep) are poisoned most frequently in autumn or spring. In intoxication, there is salivation, restlessness, distention of the rumen, frequent discharge of feces and urine, and convulsive contraction of the jaws. Characteristic are repeated tonic spasms (with prolonged contraction of muscles) and collapse of the animal, rapid pulse, and slow respiration. Death results from suffocation. Treatment consists of the immediate use of tannin, carbon, and laxative and cardiac (caffein) drugs; in the event of convulsions, chloral hydrate is used.

REFERENCE

Atlas lekarstvennykh rastenii SSSR. Moscow, 1962.
References in periodicals archive ?
The mechanism of muscle damage in Haff disease is not via GABA antagonism as in water hemlock or cicutoxin poisoning or sodium channel effects as in palytoxin poisoning.
Editorial Note: Based on mortality data files maintained by CDC's National Center for Health Statistics, from 1979 through 1988 (the most recent national data available) at least 58 persons in the United States died after ingesting a poisonous plant that was misidentified as an edible fruit or vegetable; inadvertent ingestion of water hemlock, as in the two cases in this report, caused at least five of these deaths.
Although cicutoxin is present in all parts of the water hemlock plant, the root contains the highest concentration.
Mild toxicity from water hemlock produces nausea, abdominal pain, and epigastric distress within 15-90 minutes.
Water hemlock causes most of the fatalities attributed to misidentification of poisonous plants because the plant is lethal in small quantities, resembles edible plants, and is found throughout North America.
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Some close relatives, called water hemlocks, can also be deadly.