Epipactis helleborine explained

Epipactis helleborine, the broad-leaved helleborine, is a terrestrial species of orchid with a broad distribution. It is a long lived herb which varies morphologically with ability to self-pollinate.[1]

Description

Epipactis helleborine can grow to a maximum height of or more under good conditions, and has broad dull green leaves which are strongly ribbed and flat.[2] [3] The flowers are arranged in long drooping racemes with dull green sepals and shorter upper petals. The lower labellum is pale red and is much shorter than the upper petals.[4]

Achlorophyllous, white Epipactis helleborine plants have been found. Achlorophyllous forms tend to be shorter, as small as 17 cm.[2]

Flowering occurs June–September.[5]

Distribution

This species is widespread across much of Europe and Asia, from Portugal to China, as well as northern Africa.[6] [7] [8]

In the United Kingdom, the species is widespread and common in England and Wales, but is absent from most of Scotland scattered across Ireland.[9]

In North America, it is an introduced species and widely naturalized mostly in the Northeastern United States, eastern Canada and the Great Lakes Region, but also in scattered locations in other parts of the continent.[10] [11] [6] In the US it is sometimes referred to as the "weed orchid" or "weedy orchid" and continues to spread throughout the country to new areas including Michigan,[12] Wisconsin,[13] and the San Francisco Bay Area.[14]

Habitat

Found in woods and hedge-banks[15] and often not far from paths near human activity.[16] It is one of the most likely European orchids to be found within a city, with many sites for example in Glasgow, London and Moscow. Sometimes spotted beside car parks.

Epipactis helleborine is known for its successful colonization of human-made or anthropogenic habitats such as parks, gardens or roadsides.[17] These roadside orchids exhibit special features such as large plant size and greater ability to produce flowers. Pollination plays a huge role as pollinators such as Syrphidae, Culicidae, Apidae etc. possess greater species diversity and visits the flowering sites more in anthropogenic habitats as compared to native ones. The visitation rates along with the reproductive success of these orchids are higher in large populations as they are more attractive to pollinators.

Ecology

This species of orchid is pollinated by several species of Hymenoptera, particularly the common wasp, but also other species in the genera Vespula and Dolichovespula. Flowers release a sweet nectar to attract the wasps, which has an intoxicating effect on them.[18] [19] Eight populations of Epipactis helleborine in central Europe (Lower Silesia, Poland) had their nectar studied and they were found to contain naturally occurring oxycodone (as well as another narcotic-like opioid) in minute amounts.[20]

Epipactis helleborine requires a mycorrhizal symbiosis to germinate successfully and remains partially dependent upon the fungus when plants mature, however it is not particularly selective among fungal species. Fungi associated with the live roots include Tuber, Helotiales, Peziza, Leptodontidium, Hydnotrya and Wilcoxina.[21] [22]

It has been suggested that the presence of this orchid species in a woodland is an indicator that edible truffles can be found there,[23] but this is not always the case.

Subspecies

A rather long list of names have been proposed for subspecies, varieties and forms of Epipactis helleborine, far too many to list here.[24] This is not unusual for such a widespread species. At present (November 2021) only the following are accorded international acceptance:[24]

  1. Epipactis helleborine subsp. bithynica (Robatsch) Kreutz - Turkey
  2. Epipactis helleborine subsp. helleborine - widespread
  3. Epipactis helleborine subsp. neerlandica (Verm.) Buttler - Great Britain, Norway, Denmark, Belgium, Netherlands, France, Germany
  4. Epipactis helleborine var. tangutica (Schltr.) S.C.Chen & G.H.Zhu - China
  5. Epipactis helleborine subsp. tremolsii (Pau) E.Klein - France, Spain, Portugal, Sardinia, Italy, Algeria, Morocco

Chemistry

According to a study published in 2005 by Jakubska et al. trace amounts of narcotic compounds have been identified in the plants nectar, namely 3-

Notes and References

  1. Ehlers. B. K.. Olesen. J. M.. Ågren. J.. 2002. Floral morphology and reproductive success in the orchid Epipactis helleborine: regional and local across-habitat variation. Plant Systematics and Evolution. 236. 1/2. 19–32. 10.1007/s00606-002-0197-x. 23644960. 9878820. 0378-2697.
  2. https://www.jstor.org/stable/23726409?read-now=1&refreqid=excelsior%3A3098ad4a8f1aac015858e7693580cfc5&seq=2#page_scan_tab_contents General Morphology and Anatomy of Chlorophyll-free and Green Forms of Epipactis helleborine
  3. Book: Solbraa . Knut . 50 norske og svenske orkideer . 2013 . Oplandske Bokforlag, Vallset. Norway . 978-82-7518-211-9 . 26 . Norwegian . Under gode vekstforhold kan den nå høyder på over meteren. (Under good conditions it can reach heights of more than a metre.).
  4. Webb, D.A., Parnell, J. and Doogue,D . 1996. An Irish Flora. Dundalgan Press (W. Tempest) Ltd. Dundalk.
  5. https://www.first-nature.com/flowers/epipactis-helleborine.php First Nature - Epipactis Helleborine
  6. http://apps.kew.org/wcsp/namedetail.do?name_id=70185 Kew World Checklist of Selected Plant Species, Epipactis helleborine
  7. http://luirig.altervista.org/flora/taxa/index1.php?scientific-name=epipactis+helleborine Altervista Flora Italiana, Elleborine comune, Epipactis helleborine (L.) Crantz
  8. http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=242101586 Flora of China v 25 p 180, 火烧兰 huo shao lan, Epipactis helleborine (Linnaeus) Crantz
  9. Book: Cole, Sean . Britain's Orchids . WildGuides . 2020 . 126.
  10. http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=242101586 Flora of North America v 26 p 586, Epipactis helleborine (Linnaeus) Crantz
  11. http://bonap.net/MapGallery/County/Epipactis%20helleborine.png Biota of North America Program, county range map
  12. Web site: Tenney . Angela . Hill . Erin . 2022-06-24 . Michigan State University Extension . Broad-leaved helleborine: A weedy orchid invading lawns and flowerbeds.
  13. Web site: Plant Invaders of Mid-Atlantic Natural Areas: Plants to Watch. dead . https://web.archive.org/web/20101210042954/http://www.nps.gov/plants/alien/pubs/midatlantic/plants-to-watch.htm. 2010-12-10.
  14. Web site: Epipactis helleborine.
  15. Clapham, A.R., Tutin, T.G. and Warburg, E.F. 1968. Excursion Flora of the British Isles. Cambridge University Press
  16. Beesley, S. and Wild, J. 1997. Urban Flora of Belfast. Institute of Irish Studies and The Queen's University of Belfast.
  17. Rewicz. Agnieszka. Jaskuła. Radomir. Rewicz. Tomasz. Tończyk. Grzegorz. 2017-04-18. Pollinator diversity and reproductive success of Epipactis helleborine (L.) Crantz (Orchidaceae) in anthropogenic and natural habitats. PeerJ. 5. e3159. 10.7717/peerj.3159. 2167-8359. 5398293. 28439457 . free .
  18. Web site: London Wildlife Trust - Orchid for July . 2018-12-19 . 2018-12-19 . https://web.archive.org/web/20181219134514/https://www.wildlondon.org.uk/blog/michael-waller/2017/07/21/orchid-july-broad-leaved-helleborine-epipactis-helleborine . dead .
  19. https://www.bioinfo.org.uk/html/Epipactis_helleborine.htm Bioinfo - Epipactis helleborine
  20. Jakubska . A. . Przado . D. . Steininger . M. . Aniol-Kwaitkowska . J. . Kadej . M. . Why do pollinators become "sluggish"? Nectar chemical constituents from Epipactus helleborine (L.) Crantz (Orchidaceae) . Applied Ecology and Environmental Research . 2005 . 3 . 2 . 29–38 . 10.15666/aeer/0302_029038 . free .
  21. 4934391 . 2016 . Jacquemyn . H. . Waud . M. . Lievens . B. . Brys . R. . Differences in mycorrhizal communities between Epipactis palustris, e. Helleborine and its presumed sister species e. Neerlandica . Annals of Botany . 118 . 1 . 105–114 . 10.1093/aob/mcw015 . 26946528 .
  22. Epipactis helleborine shows strong mycorrhizal preference towards ectomycorrhizal fungi with contrasting geographic distributions in Japan . 10.1007/s00572-008-0187-0 . 2008 . Ogura-Tsujita . Yuki . Yukawa . Tomohisa . Mycorrhiza . 18 . 6–7 . 331–338 . 18661158 . 19796924 .
  23. Ouanphanivanh . Noémi . Merényi . Zsolt . Orczán . Ákos Kund . Bratek . Zoltán . Szigeti . Zoltán . Illyés . Zoltán . January 2008 . Could orchids indicate truffle habitats? Mycorrhizal association between orchids and truffles . Acta Biologica Szegediensis . 52 . 1 . 229–232.
  24. https://wcsp.science.kew.org/qsearch.do?plantName=Epipactis+helleborine&page=quickSearch Kew World Checklist of Selected Plant Families - List of names for Epipactis helleborine

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