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   Index



 

MELANTHIACEAE

(Bunchflower family)

 

Referred to as the Melanthaceae in some older publications, this family of about 120 species in 21 genera comprises plants that were until recently considered to belong to the Liliaceae. They are perennial rhizomatous herbs found in the northern hemisphere and in South America (Mabberley 1997). Many are to be found in cultivation as ornamentals, for example species of Aletris L., Chamaelirium Willd., Chionographis Maxim., Helonias L. (including Heloniopsis A. Gray), Melanthium L., Narthecium Hudson, Stenanthium Kunth, Tofieldia Hudson, Veratrum L., Xerophyllum Michaux, and Zigadenus Michaux.

Medicinal and insecticidal activities have been documented for a number of species. However, the toxicity of many of these plants to humans severely limits their use. The more recently discovered teratogenicity of alkaloids present in these plants – see, for example, Keeler (1975) and Gaffield & Keeler (1994) – adds a further dimension to the toxicity profile.

[Summary yet to be added]


Narthecium ossifragum Hudson
(syn. Anthericum ossifragum L.)
Bog Asphodel

A biliary occlusive photosensitivity disorder of sheep in Great Britain and Western Europe, which is known as alveld, is caused by ingestion of bog asphodel (Videm Abdelkader et al. 1984, Wisløff et al. 2002).



Schoenocaulon jaliscense Greenman
Cebadilla

von Reis Altschul (1973) found an herbarium note stating that the roots of this Mexican plant are employed for killing maggots in wounds, either powdered and applied or decocted to make a wash.



Schoenocaulon officinale A. Gray ex Benth.
(syns Veratrum officinale Schldl. & Cham., Sabadilla officinalis Standley, Sabadilla officinarum Brandt, Helonias officinalis D. Don, Asagraea officinalis Lindl.)
Spike-Flowered Asagraea, Sabadilla, Cevadilla, Cebadilla, Caustic Barley

The seeds of this Mexican species provide the crude drug known as Sabadilla, otherwise known as Semina Sabadillae Mexicanae. Felter & Lloyd (1898) noted that although at one time used in medicine as a vermifuge and to destroy vermin in the hair, its dangerous drastic and irritating properties have caused it to be dismissed from practice. Interestingly, Sabadilla remained official in the British Pharmaceutical Codex until 1934. Pereira (1842) described the toxicity thus: "Externally, the powder of the seeds has been used to destroy pediculi. But it cannot be applied with safety to children, and especially when the skin is broken. … an infant whose nurse had sprinkled the powder in its hair, died in convulsions. … [a young man] was rendered temporarily insane by the application of powder of cebadilla to the head. … [the powder] excites violent sneezing and discharge from the nostrils. Rubbed on the skin, the tincture causes a stinging sensation similar to that produced by veratria. After its use for some days, a slight eruption appears on the skin." Veratria is an alkaloidal mixture, otherwise known as veratrine, which may be isolated from cebadilla seeds (Todd 1967), to which the toxic properties described above have been ascribed.



Veratrum L.

The 15-20 species of Veratrum are natives of northern temperate regions. Few genera illustrate more impressively the futility of employing popular plant names in scientific writing. The popular name hellebore is applied to at least two Veratrum species and is also applied to botanically unrelated Helleborus L. species (fam. Ranunculaceae). In the American West the name skunk cabbage is applied to Veratrum californicum T. Durand; in the American East, skunk cabbage is applied to the botanically unrelated aroid Symplocarpus foetidus Salisb. ex W. Barton (fam. Araceae).

According to Pammel (1911), all species are irritant.



Veratrum album L.
White Hellebore, White False Helleborine, White False Hellebore, Itchroot, Kratzwurzel

This Eurasian species is almost indistinguishable from the North American species Veratrum viride Aiton (Trease & Evans 1966). Its rhizome is the source of White Hellebore Powder, which has in the past been used as an insecticide (see, for example, Piper 1922).

The crude drug Rhizoma Veratri, otherwise known as Radix Hellebori Albi, is derived from this species (Pereira 1842, Felter & Lloyd 1898). Standardised preparations of the alkaloids — protoveratrines — from the rhizome were at one time used to treat hypertension (Todd 1967, Claus et al. 1970).

"White hellebore is a violent irritant poison, occasioning, when snuffed up into the nostrils, severe coryza. At present it is rarely used, except in the form of decoction or ointment, as an external application to kill lice, and cure the itch, pruritis [sic], and some other cutaneous affections; but, used thus, it is not always free from danger." (Felter & Lloyd 1898). Pereira (1842) describes similar uses, noting also that when placed in contact with the skin it is an energetic irritant. He also notes that the common name itch-root refers to the activity of the plant against scabies and tinea capitis.



Veratrum californicum T. Durand
California False Hellebore, Western False Hellebore, Corn Lily, Skunk Cabbage

This species is the source of cyclopamine, a teratogenic alkaloid that causes cyclopian and other deformities in foetuses of animals that have grazed on the plant during gestation (Keeler 1975, Gaffield & Keeler 1994).

Tas & Avci (2004) reported that topically applied cyclopamine cleared plaque and guttate forms of psoriasis in 3-4 days.

[Cyclopamine]



Veratrum dahuricum Loes.
(syn. Veratrum album var dahuricum Turcz.)

In Chinese traditional medicine, the rhizome — known as Xing An Li Lu — is made into a dressing for boils and skin diseases. An aqueous extract is used to kill maggots or insects (Perry & Metzger 1980).



Veratrum grandiflorum Loes.
(syns Veratrum album L. var grandiflorum Maxim. ex Baker, Veratrum bracteatum Batalin var tibeticum Loes., Veratrum puberulum Loes.)

Referring to Veratrum puberulum, Perry & Metzger (1980) note that in Chinese traditional medicine, the rhizome — known as Mao Ye Li Lu — is made into a dressing for boils and skin diseases, and that an aqueous extract is used to kill maggots or insects.



Veratrum maackii Regel
(syns Veratrum bohnhofii Loes., Veratrum mandschuricum Loes., Veratrum nigrum L. var maackii Maxim., Zigadenus japonicus Miq.)

In Chinese traditional medicine, the rhizome — known as Mao Sui Li Lu — is made into a dressing for boils and skin diseases. An aqueous extract is used to kill maggots or insects (Perry & Metzger 1980).



Veratrum nigrum L.
(syns Veratrum bracteatum Batalin, Veratrum ussuriense Nakai)
Black Hellebore, False Hellebore

In Chinese traditional medicine, the rhizome — known as Li Lu — is made into a dressing for boils and skin diseases (Perry & Metzger 1980). An aqueous extract is used to kill maggots or insects (Perry & Metzger 1980, Huang 1993).

The traditional use of a decoction of the roots or leaves of this species in Central Italy as a ovine scabicide was noted by Guarrera (1999).



Veratrum schindleri Loes.
(syns Veratrum atroviolaceum Loes., Veratrum japonicum Loes., Veratrum maackii Regel var japonicum Shimizu, Veratrum warburgii Loes.)

In Chinese traditional medicine, the rhizome — known as Gu Ling Li Lu — is made into a dressing for boils and skin diseases. An aqueous extract is used to kill maggots or insects (Perry & Metzger 1980).



Veratrum viride Aiton
(syns Helonias viridis Ker-Gawler, Veratrum album L. var viride Baker)
American Hellebore, Green Hellebore, Green False Hellebore, Swamp Hellebore, Indian Poke, Itchweed

The crude drug Rhizoma (or Radix) Veratri Viridis is derived from this species (Felter & Lloyd 1898). Standardised preparations of the alkaloids from the rhizome were at one time widely used to treat hypertension (Todd 1967, Claus et al. 1970).

"Applied to the skin, veratrum is rubefacient, and to the nose, excites sneezing. Veratrum has been justly praised as a remedy for erysipelas. It may be used both topically and internally. It is best adapted to that form showing tumefaction and redness, simulating ordinary inflammations. It has been successfully used, internally and locally, for the relief of poisoning by Rhus Toxicodendron. Boils, carbuncles, inflamed pimples, felons, ulcers, with heat and tumefaction, cellular inflammations, and labial herpes are well treated by painting specific veratrum upon them." (Felter & Lloyd 1898). Weber (1937), and Schwartz et al. (1957) citing Muenscher (1951), included this species in lists of irritant plants.


References

  • Claus EP, Tyler VE and Brady LR (1970) Pharmacognosy. 6th edn. Philadelphia: Lea & Febiger
  • Felter HW and Lloyd JU (1898) King's American Dispensatory. 18th edn; 3rd revn. Vol. I & II. Cincinnati: Ohio Valley
  • Gaffield W and Keeler RF (1994) Structure-activity relations of teratogenic natural products. Pure and Applied Chemistry 66(10/11): 2407-2410
  • Guarrera PM (1999) Traditional antihelmintic, antiparasitic and repellent uses of plants in Central Italy. Journal of Ethnopharmacology 68(1-3): 183-192
  • Huang KC (1993) The Pharmacology of Chinese Herbs. Boca Raton, Florida: CRC Press
  • Keeler RF (1975) Teratogenic effects of cyclopamine and jervine in rats, mice and hamsters. Proceedings of the Society for Experimental Biology and Medicine 149(1): 302-306
  • Mabberley DJ (1997) The Plant-Book. A portable dictionary of the vascular plants. 2nd edn. Cambridge: Cambridge University Press
  • Muenscher WCL (1951) Poisonous Plants of the United States. 2nd edn. New York: The Macmillan Company
  • Pammel LH (1911) A Manual of Poisonous Plants. Chiefly of North America, with Brief Notes on Economic and Medicinal Plants, and Numerous Illustrations. Cedar Rapids, IA: Torch Press [WorldCat] [url] [url-2]
  • Pereira J (1842) Elements of Materia Medica and Therapeutics. 2nd edn. Vol. 1 & 2. London: Longman, Brown, Green, and Longmans
  • Perry LM and Metzger J (1980) Medicinal Plants of East and Southeast Asia: Attributed Properties and Uses. Cambridge, Massachusetts: MIT Press
  • Piper CV (1922) Manure heaps in relation to house flies. Bulletin of Green Section of the United States Golf Association 2(8): 247-248
  • Schwartz L, Tulipan L, Birmingham DJ (1957) Occupational Diseases of the Skin. 3rd edn. London: Henry Kimpton
  • Tas S and Avci O (2004) Rapid clearance of psoriatic skin lesions induced by topical cyclopamine. A preliminary proof of concept study. Dermatology 209(2): 126-131
  • Todd RG (Ed.) (1967) Martindale. The Extra Pharmacopoeia. 25th edn. London: Pharmaceutical Press
  • Trease GE and Evans WC (1966) A Textbook of Pharmacognosy. 9th edn. London: Baillière, Tindall and Cassell
  • Videm Abdelkader S, Ceh L, Dishington IW, Hauge JG (1984) Alveld-producing saponins. II Toxicological studies. Acta Veterinaria Scandinavica 25(1): 76-85
  • von Reis Altschul S (1973) Drugs and Foods from Little-Known Plants. Notes in Harvard University Herbaria. Cambridge, MA: Harvard University Press [WorldCat] [url] [url-2]
  • Weber LF (1937) External causes of dermatitis. A list of irritants. Archives of Dermatology and Syphilology 35: 129-179
  • Wisløff H, Wilkins AL, Scheie E, Flåøyen A (2002) Accumulation of sapogenin conjugates and histological changes in the liver and kidneys of lambs suffering from alveld, a hepatogenous photosensitization disease of sheep grazing Narthecium ossifragum. Veterinary Research Communications 26(5): 381-396



Richard J. Schmidt [Valid HTML 4.01!]



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