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大豕草

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大豕草

科學分類
界： 植物界 Plantae
（未分级） 被子植物 Angiosperms
（未分级） 真双子叶植物 Eudicots
（未分级） 菊类植物 Asterids
目： 伞形目 Apiales
科： 伞形科 Apiaceae
屬： 独活属 Heracleum
種： H. mantegazzianum
二名法
Heracleum mantegazzianum
Sommier & Levier

大豕草（学名：Heracleum mantegazzianum） ，commonly known as giant hogweed,[1][2][3][4]，是伞形科独活属的一種一稔（英语：monocarpic）[5]的多年生開花草本植物。 H. mantegazzianum is also known as cartwheel-flower,[2][3][4] giant cow parsley,[6] giant cow parsnip,[7] or hogsbane. 在紐西蘭，本物種常 被錯誤認作欧防风或野大㦸[3]。

原产于歐亞大陸高加索及中亚地区，在19世纪作为一园艺植物被引入英国，之后在欧洲得到擴散，又被引入到美国以及加拿大地区[1]。 Its close relatives, Sosnowsky's Hogweed（英语：Sosnowsky's Hogweed） and Persian hogweed（英语：Persian hogweed）, have similarly spread to other parts of Europe.

The sap of giant hogweed is phototoxic and causes phytophotodermatitis（英语：phytophotodermatitis） in humans, resulting in blisters and scars. These serious reactions are due to the 呋喃香豆素 derivatives in the leaves, roots, stems, flowers, and seeds of the plant. Consequently, it is considered to be a noxious weed（英语：noxious weed） in many jurisdictions.[1]

大豕草分泌汁液有毒，人体若沾此汁液遇阳光后会起泡、严重会导致灼伤甚至失明[8][9]。2015年7月，英国一名10岁的小女孩随父亲钓鱼，不慎沾上大豕草汁液，导致三级灼伤[10]。

Etymology

The species name mantegazzianum refers to Paolo Mantegazza（英语：Paolo Mantegazza） (1831–1910), Italian traveller and anthropologist.[11]

Description

Green, red-spotted stem with white hairs

Giant hogweed typically grows to heights of 2至5米（6英尺7英寸至16英尺5英寸）.[1] Under ideal conditions, a plant can reach a height of 5.5米（18英尺）.[12][13] The leaves are incised and deeply lobed. A mature plant has huge leaves, between 1—1.5米（3英尺3英寸—4英尺11英寸） wide,[14] and a stout, bright green 茎 with extensive dark reddish-purple splotches and prominent coarse white hairs, especially at the base of the 葉 stalk. Hollow, ridged stems vary from 3—8 cm（1.2—3.1英寸） in diameter, occasionally up to 10 cm（3.9英寸） in diameter and can grow to more than 4米（13英尺） high. Dark red spots on the stem each surround a single hair.[15] The umbrella-shaped inflorescence, called a compound 繖形花序, may be up to 100 cm（39英寸） in diameter across its flat top. The flowers are white or greenish white and may be radially symmetrical or strongly bilaterally symmetrical (zygomorphic).[13] The fruits are schizocarp（英语：schizocarp）s, producing seeds in dry, flattened, oval pairs.[13]:825 Each seed is approximately 1 cm（0.39英寸） in length, with a broadly rounded base and broad marginal ridges, tan in color with brown lines (so-called oil tubes) extending 3/4 of the length of the seed.

Life cycle

The life cycle of giant hogweed consists of four phases:[16]

  1. Pre-flowering plants: In the first year, leaves sprout from seed. In subsequent years, leaves sprout from overwintering roots as well as seeds. This pre-flowering phase continues for several years.
  2. Flowering plants (midsummer): After several years of growth, the plant flowers.
  3. Seeds (late summer/early autumn): A flowering plant produces 20,000 or more seeds.
  4. Dead stems (late autumn/winter): After producing seeds, the plant dies, leaving dried stems and seed heads standing.

During the first few years of growth, the leaves and stem of a pre-flowering plant die over the winter. In the spring, the plant grows back from its root. In other words, the giant hogweed is a 草本植物 多年生植物.

A giant hogweed plant usually produces a flowering stalk in 3–5 years,[1][17] but plants may take up to 8 years to flower if conditions are unfavorable. In the Czech Republic, a single plant reached 12 years old before flowering.[18] In any case, when the plant finally flowers, it does so between June and July.

Seeds are typically produced in August. A single flowering plant will produce 20,000 seeds on average[19][17] with seed production varying between 10,000 and 50,000 seeds per plant.[18]

Giant hogweed is a monocarpic（英语：monocarpic） 多年生植物,[17][12][13] that is, after a mature plant flowers and produces seed, the entire plant dies. During the following winter, tall dead stems mark the locations where the flowering plants once stood.

The seeds are dispersed short distances by wind, but can travel longer distances by water, animals, and people. The vast majority of seeds (95%) are found in the top 5 cm（2.0英寸） of the soil within a few meters of the parent plant. Seeds may stay alive in the seed bank for more than five years.[18][19]

A seed deposited in the seed bank is initially dormant. Dormancy is broken by the cold and wet conditions of fall and winter, and so freshly deposited seeds lay dormant until at least the following spring, at which time approximately 90% of the previously dormant seeds will germinate.[17][12] The rest remain dormant in the seed bank.

Seeds normally result from cross-pollination between two or more plants but self-pollination is also possible. More than half the seeds produced by self-pollination will germinate and give rise to healthy seedlings.[17] Hence a single isolated seed may give rise to a colony of new plants.

Similar species

The various species of the genus 独活属 are similar in appearance, but vary in size.[12] H. mantegazzianum is among the tallest, typically reaching 4米（13英尺） high (and sometimes more than 5米（16英尺） high), whereas Heracleum species native to Western Europe or North America, such as the cow parsnip (H. maximum), rarely exceed 3米（9.8英尺） high.[12][14][17] There are considerable differences in the size of the umbel, leaves, and stem of H. mantegazzianum as well.

The following table compares Heracleum mantegazzianum and Heracleum maximum（英语：Heracleum maximum） feature by feature:

H. mantegazzianum H. maximum
Height Typically 3至4.5米（9.8至14.8英尺） tall Up to 2.5米（8英尺2英寸） tall
Leaves Compound, lobed leaves typically 100 cm（39英寸） wide, up to 150 cm（59英寸） wide; mature leaf has deep incisions and serrated edges Compound, lobed leaves up to 60 cm（24英寸）; mature leaf is less incised with less jagged edges
Stem Green stems from 3—8 cm（1.2—3.1英寸） in diameter, occasionally up to 10 cm（3.9英寸） in diameter, with dark reddish-purple splotches and coarse white hairs at the base of the leaf stalk Green ridged stems up to 5 cm（2.0英寸） in diameter with fine white hairs (no purple splotches)
Flowers White umbel is typically 80 cm（31英寸） in diameter, up to 100 cm（39英寸） in diameter, with 50–150 flower rays per umbel; flowers bloom mid-June to mid-July White umbel up to 30 cm（12英寸） in diameter with 15–30 flower rays per umbel; flowers bloom late May to late June
Fruits Oval-shaped fruits Heart-shaped fruits

Other plant species in the family 伞形科 have features similar to those of the giant hogweed (H. mantegazzianum):

In Europe, over 20 species of the genus Heracleum have been recorded.[17] Identification of Heracleum mantegazzianum is further complicated by the presence of two additional tall invasive hogweed species: Heracleum sosnowskyi and Heracleum persicum. Other than size (as mentioned above), these three species have very similar characteristics.

Historical background

Heracleum mantegazzianum is native to the western 高加索 region of 歐亞大陸.[1] Because of its impressive size, giant hogweed was brought to Europe and North America as an ornamental plant and garden curiosity.

The following historical information[17][20][21][18] grew out of the European Giant Alien Project, which began in 2005.

Migration across Europe

Heracleum mantegazzianum was first described in the scientific literature in 1895 but by that time more than a dozen European countries had already imported the plant as “an ornamental curiosity.” The introduction of Heracleum mantegazzianum was first recorded in Great Britain in 1817 when it was put on the seed list at the Kew Botanic Gardens in London. By 1828, the first natural population was recorded, growing wild in Cambridgeshire, England.

The spread of Heracleum mantegazzianum throughout Europe continued unabated until the middle of the 20th century, at which time the dangers of giant hogweed had become more widely known. Despite the warnings, however, the plant continued to be used by gardeners, beekeepers, and farmers (for cattle fodder) for another 50 years. Heracleum mantegazzianum was finally de-listed by the Royal Horticultural Society of Great Britain in 2002.

Migration to North America

During the 20th century, giant hogweed was transported to the United States and Canada for display in arboreta and Victorian gardens. The earliest recorded planting in North America was in 1917, in gardens near Highland Park in the city of Rochester, New York.

By 1950, giant hogweed had appeared in southern Ontario, and within a quarter century, the plant was firmly established in Ontario. It was first collected from Nova Scotia in 1980 and Quebec in 1990. Giant hogweed was still available for sale in Canadian nurseries as late as 2005.

On the west coast of North America, Heracleum mantegazzianum appeared in Oregon, Washington, and southwestern Canada but it is not clear how the species found its way into this region. First reports of giant hogweed in British Columbia were published in the 1930s.

Distribution

Distribution of giant hogweed in Europe (2005)

Giant hogweed is widespread throughout western and northern Europe, especially along many terrains, such as coastal areas and riverbanks.[1] By forming dense stands, it can displace native plants and reduce wildlife habitats.[1][22] It has spread in the northeastern and northwestern United States, and southern Canada and is an 入侵物种 across western Europe;[1] in sites where it has settled, it overtakes the local native species, Heracleum sphondylium.[22]

In Canada, the plant occurs in most provinces, except the 草原三省.[1] It has been seen in Quebec since the early 1990s.[23] The plant's spread in Ontario began in Southwestern Ontario（英语：Southwestern Ontario） and was seen in 2010 in the 大多倫多地區 and 伦弗鲁县 near Ottawa.[24]

In the United States, giant hogweed occurs in Wisconsin and south to Indiana, Michigan, Maryland, and New Jersey.[25][18][26] In June 2018, it was reported growing in Virginia and North Carolina.[27][28] The plant is a federally listed as a noxious weed（英语：noxious weed） in many US states.[25]

Public health and safety

Giant hogweed flower head

The sap of the giant hogweed plant is 光毒性. Contact with the plant sap prevents the skin from protecting itself from sunlight, which leads to phytophotodermatitis（英语：phytophotodermatitis）, a serious skin inflammation.[29] A phototoxic reaction can begin as soon as 15 minutes after contact with the sap. 感光性 peaks between 30 minutes and two hours after contact but can last for several days.[17][12] Authorities advise that all humans (especially children) should stay away from giant hogweed. Protective clothing, including eye protection, should be worn when handling the plant. If you come in contact with the sap of the giant hogweed, immediately wash the affected area with soap and cold water and avoid further exposure to sunlight for at least 48 hours.[17][22][29] The giant hogweed shares this property with its Heracleum relatives, such as the cow parsnip, and hence, similar caution is advised in handling these. Due to its shared physical similarities to the flower 野胡萝卜, it can be easily mistaken as a harmless plant.[30]

Control measures

Because of its phototoxicity and invasive nature, giant hogweed is often actively removed. The 欧洲联盟 funded the Giant Alien project to combat the plant.[31][32][33] On August 2, 2017, it added the species to its List of Invasive Alien Species of Union concern,[34] thus placing restrictions on keeping, importing, selling, breeding and growing it and requiring governments to detect and eradicate it throughout the EU. In the UK, the Wildlife and Countryside Act 1981（英语：Wildlife and Countryside Act 1981） makes it an offence to plant or cause giant hogweed to grow in the wild.[22][35]

In the US, hogweed is regulated as a Federal Noxious Weed Act of 1974（英语：Federal Noxious Weed Act of 1974） by the US government, and is illegal to import into the United States or move interstate without a permit from the 美国农业部.[36] The USDA Forest Service states pigs and cattle can eat it without apparent harm.[37] The New York State Department of Environmental Conservation（英语：New York State Department of Environmental Conservation） has had an active program to control giant hogweed since 2008.[38] In 2011, Maine state horticulturists, describing the plant as "野胡萝卜 on steroids", reported that it has been found at 21 different locations in Maine, with the number of plants ranging from one to a hundred.[39]

In 1971, the progressive rock band 創世紀樂團 released their third album Nursery Cryme（英语：Nursery Cryme）, which includes the track "The Return of the Giant Hogweed." The song tells the story of the plant's introduction to Britain:

Long ago in the Russian hills
A Victorian explorer found the regal Hogweed by a marsh
He captured it and brought it home.
He came back to London
And made a present of the Hogweed
To the Royal Gardens at Kew

The lyrics go on to goad the reader to "strike by night" since the invading plants "need the sun to photosensitize their venom," which demonstrates a fair appreciation for the mechanism of phytophotodermatitis（英语：phytophotodermatitis）.

See also

References

  1. ^ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 Heracleum mantegazzianum (giant hogweed). CABI. 6 November 2018 [8 December 2018]. 
  2. ^ 2.0 2.1 Heracleum mantegazzianum. Germplasm Resources Information Network (GRIN). USDA. [2013-08-06]. 
  3. ^ 3.0 3.1 3.2 National Pest Plant Accord. Ministry for Primary Industries, Government of New Zealand: 70. 2012. （原始内容存档于4 February 2018）. 
  4. ^ 4.0 4.1 Species Profile- Giant Hogweed (Heracleum mantegazzianum). National Invasive Species Information Center, United States National Agricultural Library. 
  5. ^ ?. [2019-06-03] （中文（繁體））. 
  6. ^ Forney, Thomas; Miller, Glenn; Myers-Shenai Beth. Oregon Department of Agriculture Plant Pest Risk Assessment for Giant Hogweed Heracleum mantegazzianum (PDF). 27 May 2009. （原始内容 (PDF)存档于28 May 2010）. 
  7. ^ Giant Hogweed. Wild Food UK. [August 13, 2018]. 
  8. ^ Dayly Mail. How to survive this year's curse of giant hogweed: Leading experts reveal exactly what it is, why it's so deadly, and what to do if you come into contact with it
  9. ^ https://www.theweathernetwork.com/ca/news/article/plant-that-can-cause-third-degree-burns-popping-up-in-canada-giant-hogweed-ontario-bc-prairies-maritimes-heracleum-mantegazzianum#
  10. ^ Daily Mail. Girl, ten, is left in agony with third-degree burns after picking up giant hogweed while playing on a riverbank
  11. ^ Gledhill, David. The Names of Plants (PDF) 4th. Cambridge University Press. 2008: 250. ISBN 9780521866453. 
  12. ^ 12.0 12.1 12.2 12.3 12.4 12.5 12.6 12.7 MacDonald, Francine; Anderson, Hayley. Giant Hogweed (Heracleum mantegazzianum): Best Management Practices in Ontario (PDF). Ontario Invasive Plant Council, Peterborough, ON. May 2012 [September 1, 2018]. 
  13. ^ 13.0 13.1 13.2 13.3 Stace, C. A. New Flora of the British Isles Third. Cambridge, U.K.: Cambridge University Press. 2010: 450. ISBN 9780521707725. 
  14. ^ 14.0 14.1 14.2 14.3 Giant Hogweed Identification. New York State Department of Environmental Conservation. [September 6, 2018]. 
  15. ^ Parnell, J. and Curtis, T. 2012. Webb's An Irish Flora. Cork University Press. ISBN 978-185918-4783
  16. ^ Beware Giant Hogweed! (PDF). New York State Department of Environmental Conservation. [September 1, 2018]. 
  17. ^ 17.00 17.01 17.02 17.03 17.04 17.05 17.06 17.07 17.08 17.09 17.10 17.11 Booy, Olaf; Cock, Matthew; Eckstein, Lutz; Hansen, Steen Ole; Hattendorf, Jan; Hüls, Jörg; Jahodová, Sárka; Krinke, Lucás; Marovoková, Lanka; Müllerová, Jana; Nentwig, Wolfgang; Nielsen, Charlotte; Otte, Annette; Pergl, Jan; Perglová, Irena; Priekule, Ilze; Pusek, Petr; Ravn, Hans Peter; Thiele, Jan; Trybush, Sviatlana; Wittenberg, Rüdiger. The giant hogweed best practice manual: guidelines for the management and control of invasive weeds in Europe (PDF). Hørsholm: Center for Skov, Landskab og Planlægning/Københavns Universitet. 2005 [September 1, 2018]. ISBN 87-7903-209-5. 
  18. ^ 18.0 18.1 18.2 18.3 18.4 Gucker, Corey L. Heracleum mantegazzianum. Fire Effects Information System. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). 2009 [September 11, 2018]. 
  19. ^ 19.0 19.1 Giant Hogweed Biology. New York State Department of Environmental Conservation. [September 1, 2018]. 
  20. ^ Klingenstein, F. NOBANIS – Invasive Alien Species Fact Sheet – Heracleum mantegazzianum (PDF). Online Database of the North European and Baltic Network on Invasive Alien Species. NOBANIS. 2007 [September 17, 2018]. 
  21. ^ O’Neill, Jr., Charles R. Giant Hogweed (Heracleum mantegazzianum) - Poisonous Invader of the Northeast (PDF). New York Sea Grant, SUNY College at Brockport. February 2007 [September 18, 2018]. 
  22. ^ 22.0 22.1 22.2 22.3 Giant hogweed information. NetRegs. U.K. Government. （原始内容存档于2007-02-23）. 
  23. ^ 5 things you need to know about toxic hogweed. CBC News. 
  24. ^ Halfnight, Drew. Giant weed that burns and blinds spreads across Canada. The National Post. July 13, 2010. 
  25. ^ 25.0 25.1 Plants profile for Heracleum mantegazzianum. 
  26. ^ Giant hogweed: Not widely spread in Michigan. 
  27. ^ Diebel, Matthew. Giant Hogweed, a Plant That Can Cause Burns and Blindness, Found in Virginia. USA Today. 18 June 2018. 
  28. ^ Ducharme, Jamie. A Giant Plant That Can Cause Blindness Was Spotted for the First Time in a New State. Time (New York). June 20, 2018. 
  29. ^ 29.0 29.1 Health Hazards & Safety Instructions for Giant Hogweed (with graphic photos). New York State Department of Environmental Conservation. [September 3, 2018]. 
  30. ^ How to spot giant hogweed | CTV News. www.ctvnews.ca. [2018-12-08]. 
  31. ^ Giant Alien. Giant Alien Project, project no. EVK2-CT-2001-00128, European Union. （原始内容存档于2016-10-03）. 
  32. ^ Giant alien — Result In Brief. [2018-07-04]. 
  33. ^ Giant Hogweed (Heracleum mantegazzianum) - A pernicious invasive weed: Developing a sustainable strategy for alien invasive plant management in Europe.. [2018-07-04]. 
  34. ^ List of Invasive Alien Species of Union concern. [2018-07-04]. 
  35. ^ Wildlife & Countryside Act 1981 Section 14 and Schedule 9, Part II.
  36. ^ Invasive and Noxious Weeds: Federal Noxious Weeds. Natural Resources Conservation Service. U.S. Department of Agriculture. 
  37. ^ Giant Hogweed (PDF). USDA Forest Service. June 20, 2005 [August 13, 2018]. 
  38. ^ NYSDEC Giant Hogweed Control Program. New Paltz, N.Y.: New York State Department of Environmental Conservation. （原始内容存档于May 6, 2015）. 
  39. ^ State confirms poisonous plant sightings. The Portland Press Herald. May 22, 2012 [2015-06-21]. 
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