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UMBELLIFERAE — 4
Heracleum

(Umbellifer or Carrot family)

[ * Aciphylla - Anthriscus * ][ * Apium - Carum * ][ * Centella - Foeniculum * ]
[ * Heracleum * ][ * Levisticum - Pastinaca * ][ * Petroselinum - Trachyspermum * ]
[ * References * ]

Heracleum

Cow Parsnip, Berce

70 species are found in north temperate regions and on tropical mountains.

Chemistry is recorded by Molho et al. (1971) and by Nielsen (1970). Of 29 species investigated, all were found to yield linear furanocoumarins.

The outer rind and the root of the cow parsnip (berce) contain an acrid sap sufficiently strong to inflame and ulcerate the skin (Chaumton 1815). Persons handling or weeding the plants develop papulo-vesicular or bullous dermatitis (Legraine and Barthe 1926). The roots and rind of certain Heracleum species contain an acrid irritant sap (Behl et al. 1966). Cases of dermatitis from the plants were reported by Imschenetzky (1928), Colomb et al. (1969), Sokolova (1968), Klepov (1960), Leonenko (1962), Krauskoff and Belek (1972). Camm et al. (1976) note the difficulties of botanical identification for phytochemical study, numerous synonyms for plant species and the absence of a botanical monograph of the genus.

Heracleum alpinum

This species yields furanocoumarins (Molho et al. 1971).

Heracleum antasiaticum

This species yields 5-methoxypsoralen from the roots (Nielsen 1970).

Heracleum asperum

This species yields 5-methoxypsoralen from the fruits (Nielsen 1970).

Heracleum candicans

This species yields 5-methoxypsoralen from the fruits (Nielsen 1970).

Heracleum ceylanicum

This species yields furanocoumarins (Molho et al. 1971).

Heracleum concanense

This species yields 5-methoxypsoralen from the fruits (Nielsen 1970).

Heracleum cyclocarpum

This species yields 5-methoxypsoralen from the roots (Nielsen 1970).

Heracleum dissectum

This species yields 5-methoxypsoralen from the roots (Nielsen 1970).

Heracleum dulce

357 cases of photodermatitis from this species were reported by Efremov (1961); he noted a requirement for sunlight in evoking the dermatitis since inunction of the juice of the plant without exposure to sunlight was harmless.

Heracleum flavescens

This species yields furanocoumarins (Molho et al. 1971).

Heracleum hypoleucum

This species yields 5-methoxypsoralen from the fruits (Nielsen 1970).

Heracleum laciniatum

This species yields 5-methoxypsoralen from the fruits (Nielsen 1970).

Heracleum lanatum

Masterwort, Cow Parsnip

The young leaf-stalks and young stems, before the expanding of the flowers, are eaten like stewed celery (Apium). The northern Indians of the United States ate the peeled stalks either raw or cooked (Fernald and Kincey 1943). This plant was the most widely used native umbellifer in North America, being employed in numerous ways (French 1971). The blossoms were steeped in oil and rubbed on the body to keep off flies and mosquitoes by North American Indians (Smith 1929). The plant is used for rubefacient purposes (Courchet 1882). The leaves are used as a counter-irritant and may produce vesication (Dispensatory 1884). Portions of the leaf and stem using the method of Daniels (1965) were phototoxic for Candida albicans (Camm et al. 1976). The fruits yield 5-methoxypsoralen (Molho et al. 1971).

Extracts of the plant inhibit DNA repair in UV-irradiated cultured human fibroblasts (Stich et al. 1975).

Heracleum lanatum var asiaticum

This variety yields 5-methoxypsoralen from the fruits (Nielsen 1970).

Heracleum lanatum var nipponicum

This variety yields 5-methoxypsoralen from the roots and fruits (Nielsen 1970).

Heracleum lehmannianum

This species yields 5-methoxypsoralen from the fruits (Nielsen 1970).

Heracleum leucocarpum

This species yields furanocoumarins (Molho et al. 1971).

Heracleum mantegazzianum Sommier & Levier

(syns Heracleum giganteum hort., Heracleum villosum hort.)

Giant Hogweed, Wild Parsnip, Wild Rhubarb

This species is a native of the Caucasus and has been introduced into horticulture. Dermatitis from the plant was reported by Miescher and Burckhardt (1937) who suspected the possibility of light sensitisation. Kuske (1938, 1940) elicited bullous reactions 48 to 72 hours after applying fresh plant juice to the skin and following this with 40 minutes exposure to sunlight. The subsequent English and German literature concerning this plant was reviewed by Drever and Hunter (1970) who reported 13 cases of dermatitis from Scotland. Additional reports were provided by Jones and Russell (1968), Smellie (1968), Kvicalova and Stava (1962), Camm et al. (1976).

Contact with the young shoots of a plant identified as Heracleum giganteum caused acute dermatitis of the hands and forearms of a gardener (Stowers 1897). Harrison (1906), perhaps referring to this earlier case, included Heracleum giganteum in a list of plants, etc., which may cause dermatitis. Straton (1912) reported that he had occasionally seen, in summer, contact dermatitis affecting the hands and arms of gardeners who had handled the cut stems of Heracleum giganteum, which was largely used in the arrangement of perennial borders. In the worst case, the patient had cut down about 200 plants and the hands and arms had become smeared with the sap. Wherever it touched, it produced a glow which was soon followed by intense itching and burning; then an erythemato-vesicular eruption appeared. However he said, unlike that produced by Toxicodendron, it never spread to other parts of the body but was limited to the areas actually touched by the sap. He further observed that the acridity of the sap of Heracleum, Angelica and similar plants varied with the season of the year and all skins were not equally susceptible to its action.

Hinterman (1962) reported dermatitis from the plant in a dog. A woman had phytophotodermatitis of the skin of the jaw-line from contact with her cat which had been playing with her garden specimen of the plant (Champion, R.H. 1974, pers. comm. to Camm et al. 1976).

The plant was reported to be running slightly wild in central Europe (Schulz and Spier 1951). Naturalisation and spread of the plant has occurred in the United Kingdom in the past sixty years (Drever and Hunter 1970).

The plant was introduced to Kew Gardens, England for ornamental purposes but has now become a frank weed, usually found near water. The plant can grow to nearly 4m during its growing season and has large hollow stems. Those affected are most often fishermen and bathers and children who use the hollow stems for a telescope or pea-shooter and for blowing noises as with a trumpet. The hands are usually affected and also the back of those who have been hit with the stem in children's play. Cutting of plants for the intended purpose of eradication may result in dispersal since the dried stems and flower heads readily float downstream to reach the lower reaches (Editorial 1970).

The botanical taxonomy of the plant is complex, in that two authored species and a 'Kew species' are known (Molho et al. 1971). The Causasian species has been divided into three species (Mandenova 1950). The plant yields 5-methoxypsoralen and 8-methoxypsoralen (Nielsen 1970). Chemovars i.e. biochemical varieties, within a species are reported (Molho et al. 1971). The essential oil from the plant contains chemicals (Jain 1969) which give rise to a notion that allergic contact dermatitis from the plant is a possibility.

Heracleum giganteum Fisch. yields 5-methoxypsoralen from the fruits (Nielsen 1970).

Heracleum montanum

This species yields furanocoumarins (Molho et al. 1971).

Heracleum nepalense

The roots and rind contain an acrid irritant sap (Behl et al. 1966). This species yields 5-methoxypsoralen from the fruits (Nielsen 1970).

Heracleum olgae

This species yields 5-methoxypsoralen from the fruits (Nielsen 1970).

Heracleum palmatum

This species yields furanocoumarins (Molho et al. 1971).

Heracleum panaces

This species yields 5-methoxypsoralen from the roots (Nielsen 1970).

Heracleum pastinacifolium

This species yields 5-methoxypsoralen from the fruits (Nielsen 1970).

Heracleum persicum

This species is listed as a source of phytophotodermatitis (Van Dijk and Berrens 1964).

Heracleum platytaenium

This species yields furanocoumarins (Nielsen 1970).

Heracleum pubescens

This species yields 5-methoxypsoralen from the fruits (Nielsen 1970).

Heracleum pyrenaicum

This species yields furanocoumarins (Molho et al. 1971).

Heracleum sosnowskyi

This species yields 5-methoxypsoralen and 8-methoxypsoralen from the stalks, leaves and fruits (Nielsen 1970).

Heracleum sphondylium L.

European Cow Parsnip, Hogweed, Heltrot, Cow Parsley, Bibernell

This species is reported to evoke phytophotodermatitis (Van Dijk and Berrens 1964, Pathak et al. 1962). Michon et al. (1956) reported purpuric dermatitis from the plant. This species yields 5-methoxypsoralen and 8-methoxypsoralen from the roots and fruits (Nielsen 1970).

Heracleum sphondylium L. ssp sibiricum Simonk.

(syn. Heracleum sibiricum L.)

Siberian Cow Parsnip, Siberian Hogweed

The bark and roots of Heracleum sibiricum are corrosive and vesicant (Courchet 1882). This species yields 5-methoxypsoralen from the fruits (Nielsen 1970).

Heracleum sprengelianum

This species yields furanocoumarins (Molho et al. 1971).

Heracleum stevenii

This species yields 5-methoxypsoralen from the fruits (Nielsen 1970).

Heracleum trachyloma

This species yields 5-methoxypsoralen from the fruits (Nielsen 1970).

Heracleum transcaucasicum

This species yields 5-methoxypsoralen from the fruits (Nielsen 1970).

Heracleum villosa

This species yields 8-methoxypsoralen (Nielsen 1970).

Heracleum wilhelmsii

This species yields furanocoumarins (Molho et al. 1970).

[ * Aciphylla - Anthriscus * ][ * Apium - Carum * ][ * Centella - Foeniculum * ]
[ * Heracleum * ][ * Levisticum - Pastinaca * ][ * Petroselinum - Trachyspermum * ]
[ * References * ]

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