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Hemlock | | Name : | Hemlock | | Botanical : | Conium maculatum | | Synonyms : | Herb Bennet. Spotted Corobane. Musquash Root. Beaver Poison. Poison Hemlock. Poison Parsley. Spotted Hemlock. Kex. Kecksies. | | Family : | Umbelliferae | | Parts Used : | Leaves, fruit, seeds. | | Habitat : | It is by no means an uncommon plant in this country, found on hedgebanks, in neglected meadows, on waste ground and by the borders of streams in most parts of England, occurring in similar places throughout Europe (except the extreme north) and also in temperate Asia and North Africa. It has been introduced into North and South America. | | Description : | Hemlock is a tall, much branched and gracefully growing plant, with elegantly-cut foliage and white flowers. Country people very generally call by the name of Hemlock many species of umbelliferous plants, but the real Hemlock may be distinguished by its slender growth, perfectly smooth stem which is marked with red, and its finely-divided leaves which are also smooth.
It is a biennial plant, usually growing from 2 to 4 feet high, but in sheltered situations sometimes attaining nearly double that height. The root is long, forked, pale yellow and 1/2 to 3/4 inch in diameter. The erect, smooth stem, stout below, much branched above and hollow, is bright green, but (as already stated) is distinctively mottled with small irregular stains or spots of a port-wine colour and also covered with a white 'bloom' which is very easily rubbed off.
The leaves are numerous, those of the first year and the lower ones very large, even reaching 2 feet in length, alternate, longstalked, tripinnate (divided along the midrib into opposite pairs of leaflets and these again divided and subdivided in similar manner). The upper leaves are much smaller, nearly stalkless, with the short footstalk dilated and stem-clasping, often opposite or three together, more oblong in outline, dipinnate or pinnate, quite smooth, uniform dull green, segments toothed, each tooth being tipped with a minute, sharp white point.
The umbels are rather small, 1 1/4 to 2 inches broad, numerous, terminal, on rather short flower stalks, with 12 to 16 rays to the umbel. At the base of the main umbel there are 4 to 8 lance-shaped, deflexed bracts; at the base of the small umbels there are three or four spreading bractlets. The flowers are small, their petals white with an inflexed point, the stamens a little longer than the petals, with white anthers.
The fruit is small, about 1/8 inch long broad, ridged, compressed laterally and smooth. Both flowers and fruit bear a resemblance to caraway, but the prominent crenate (wavy) ridges and absence of vittae (oil cells between the ridges) are important characters for distinguishing this fruit from others of the same natural order of plants.
The entire plant has a bitter taste and possesses a disagreeable mousy odour, which is especially noticeable when bruised. When dry, the odour is still disagreeable, but not so pronounced as in the fresh plant. The seeds or fruits have very marked odour or taste, but when rubbed with a solution of potassium bi-oxide, the same disagreeable mouse-like odour is produced.
The poisonous property occurs in all parts of the plant, though it is stated to be less strong in the root. Poisoning has occurred from eating the leaves for parsley, the roots for parsnips and the seeds in mistake for anise seeds. Many children, too, have suffered by using whistles made from the hollow stems of the Hemlock, which should be extirpated from meadows and pastures since many domestic animals have been killed by eating it, though goats are said to eat it with impunity. | | Constituents : | By far the most important constituent of hemlock leaves is the alkaloid Coniine, of which they may contain, when collected at the proper time, as much as 2.77 per cent the average being 1.65 per cent. When pure, Coniine is a volatile, colourless, oily liquid, strongly alkaline, with poisonous properties and having a bitter taste and a disagreeable, penetrating, mouse-like odour.
There are also present the alkaloids, Methyl-coniine, Conhydrine, Pseudoconhydrine, Ethyl piperidine, mucilage, a fixed oil and 12 per cent of ash.
Hemlock fruits have essentially the same active constituents, but yield a greater portion of Coniine than the leaves. | | Uses : | As a medicine, Conium is sedative and antispasmodic, and in sufficient doses acts as a paralyser to the centres of motion. In its action it is, therefore, directly antagonistic to that of Strychnine, and hence it has been recommended as an antidote to Strychnine poisoning, and in other poisons of the same class, and in tetanus, hydrophobia, etc. (In mediaeval days, Hemlock mixed with betony and fennel seed was considered a cure for the bite of a mad dog.)
On account of its peculiar sedative action on the motor centres, Hemlock juice (Succus conii) is prescribed as a remedy in cases of undue nervous motor excitability, such as teething in children, epilepsy from dentition. cramp, in the early stages of paralysis agitans, in spasms of the larynx and gullet, in acute mania, etc. As an inhalation it is said to relieve cough in bronchitis, whooping-cough, asthma, etc.
The drug has to be administered with care, as narcotic poisoning may result from internal use, and overdoses produce paralysis. In poisonous doses it produces complete paralysis with loss of speech, the respiratory function is at first depressed and ultimately ceases altogether and death results from asphyxia. The mind remains unaffected to the last. In the account of the death of Socrates, reference is made to loss of sensation as one of the prominent symptoms of his poisoning, but the dominant action is on the motor system. It is placed in Table II of the Poison Schedule.
Hemlock was formerly believed to exercise an alterative effect in scrofulous disorders. Both the Greek and Arabian physicians were in the practice of using it for the cure of indolent tumours, swellings and pains of the joints, as well as for affections of the skin. Among the moderns Baron Storch was the first to call the attention of medical men to its use, both externally and internally, for the cure of cancerous and other ulcers, and in the form of a poultice or ointment it has been found a very valuable application to relieve pain in these cases.
In the case of poisoning by Hemlock, the antidotes are tannic acid, stimulants and coffee, emetics of zinc, or mustard and castor oil, and, if necessary, artificial respiration. It is essential to keep up the temperature of the body.
Like many other poisonous plants, when cut and dried, Hemlock loses much of its poisonous properties, which are volatile and easily dissipated. Cooking destroys it.
Its disagreeable odour has prevented its fatal use as a vegetable in the raw state.
Larks and quails are said to eat Hemlock with impunity, but their flesh becomes so impregnated with the poison that they are poisonous as food. Thrushes eat the fruits with impunity, but ducks have been poisoned by them.Coles' Art of Simpling: 'If Asses chance to feed much upon Hemlock, they will fall so fast asleep that they will seeme to be dead, in so much that some thinking them to be dead indeed have flayed off their skins, yet after the Hemlock had done operating they have stirred and wakened out of their sleep, to the griefe and amazement of the owners.' | | Dosage : | Powdered leaves 1 to 3 grains. Fluid extract of leaves, 5 to 10 drops. Fluid extract of seeds, 2 to 5 drops. Tincture seeds, B.P., 1/2 to 1 drachm. Juice of leaves, B.P., 1 to 2 drachms. Solid extract, 2 to 6 grains. Ointment, B.P.
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