Lysichiton americanus Hultén & H. St. John

English American skunk-cabbage, swamp lantern ISEIA: B0 – Alert List. IAS of EU concern (2016)
Lëtzebuergesch n/a EASIN | CABI
Français Lysichiton américain Wikipedia: Wikipedia - English - American skunk-cabbage Wikipedia - Français - Lysichiton américain Wikipedia - Deutsch - Amerikanischer Stinktierkohl Wikipedia - Nederlands - Moeraslantaarn
Deutsch Amerikanischer Stinktierkohl Wikispecies: Wikispecies - Lysichiton americanus
Nederlands Moeraslantaarn Back to the list of neophytes

Importance and distribution in Luxembourg

The species has not yet been observed in Luxembourg.

Lysichiton americanus grows in the transition zone of terrestrial, semi-aquatic and aquatic habitats like swamps, fens, wet meadows, marshy and alluvial woodlands, along streams, riverbanks, lakesides and ponds. It has no specific site condition requirements except the presence of saturated organic soils. It is often found in protected semi-natural habitats. Lysichiton reproduces almost exclusively by seeds, which may be dispersed downstream along waterways. However, spread by natural means is not frequent and rather limited. L. americanus has become established locally in swamp forests and associated wetlands in the EPPO region (resulting most of the time from plantation in the site). After some years, its huge leaves build a dense layer excluding light from native species which are usually not adapted to extreme darkness. It can displace and cause local extinction of rare species of mosses and vascular plants (Carex echinata,Viola palustris, and orchids). (Source: http://ias.biodiversity.be/species/show/12).

Risk assessment

ISEIA protocol: A0 (2+3+3+2) = Alert List. First assessed 24 January 2019 by Manou Pfeiffenschneider and Christian Ries.

Bibliography concerning Luxembourg

n/a

 Last updated on Thursday, January 24, 2019.

Ludwigia peploides (Kunth.) P.H. Raven

English Creeping water primrose ISEIA: A0 – Alert List. IAS of EU concern (2016)
Lëtzebuergesch n/a EASIN | CABI
Français Jussie rampante Wikipedia: Wikipedia - English - Creeping water primrose Wikipedia - Français - Jussie rampante Wikipedia - Nederlands - Kleine Waterteunisbloem
Deutsch Kriechendes Heusenkraut Wikispecies: Wikispecies - Ludwigia_peploides
Nederlands Kleine waterteunisbloem Back to the list of neophytes

Importance and distribution in Luxembourg

The species has not yet been observed in Luxembourg.

L. peploides is an amphibious plant living in ponds, lakes, ditches, channels and slow-running rivers as well as in humid meadows. It shows a high tolerance to different water levels. Its growth is favoured by water eutrophication but the plant is able to develop in oligotrophic environments. Both clonal and sexual reproductions contribute to plant spread across watersheds. Water primroses are highly detrimental to the environment in Western Europe. They quickly develop and make very thick monospecific floating carpets at the surface of water bodies. They alter the physico-chemical quality of water (reduction of light and dissolved oxygen) and possess an allelopathic activity that influences the water quality throughout the year and reduces the germination and survival rates of other plant species. They outcompete most of native water plants and create an anoxic environment detrimental to many plant and animal species. In addition, they modify water flow and cause wetland drying. (Source: http://ias.biodiversity.be/species/show/12).

Risk assessment

ISEIA protocol: A0 (3+3+2+3) = Alert List. First assessed 24 January 2019 by Manou Pfeiffenschneider and Christian Ries.

Bibliography concerning Luxembourg

n/a

 Last updated on Thursday, January 24, 2019.

Ludwigia grandiflora (Michx.) Greuter & Burdet

English Water primrose ISEIA: A0 – Alert List. IAS of EU concern (2016)
Lëtzebuergesch n/a EASIN | CABI
Français Jussie à grandes fleurs, Grande J. Wikipedia: Wikipedia - Français - Jussie à grandes fleurs Wikipedia - Deutsch - Großblütige Heusenkraut Wikipedia - Nederlands - Waterteunisbloem
Deutsch Großblütiges Heusenkraut Wikispecies: Wikispecies - Ludwigia_grandiflora
Nederlands Waterteunisbloem Back to the list of neophytes

Importance and distribution in Luxembourg

The species has not yet been observed in Luxembourg.

L. grandiflora is an amphibious species living in ponds, lakes, ditches, channels and slow-running rivers as well as in humid meadows. It shows a high tolerance to different water levels. Its growth is favoured by water eutrophication but the plant is able to develop in oligotrophic environments. Invasive spread across watersheds is almost exclusively clonal and brought about by the dispersal of vegetative propagules by waterflow. Water primroses are highly detrimental to the environment in Western Europe. They quickly develop and make very thick monospecific floating carpets at the surface of water bodies. They alter the physico-chemical quality of water (reduction of light and dissolved oxygen) and possess an allelopathic activity that influences the water quality throughout the year and reduces the germination and survival rates of other plant species. They outcompete most of native water plants and create an anoxic environment detrimental to many plant and animal species. In addition, they modify water flow and cause wetland drying. (Source: http://ias.biodiversity.be/species/show/11).

Risk assessment

ISEIA protocol: A0 (3+3+2+3) = Alert List. First assessed 24 January 2019 by Manou Pfeiffenschneider and Christian Ries.

Bibliography concerning Luxembourg

n/a

 Last updated on Thursday, January 24, 2019.

Parthenocissus quinquefolia (L.) Planch.

English Five-leaved Virginia creeper ISEIA: B1 – Watch List
Lëtzebuergesch Fënnefbliedrege Wëlle Wäin EASIN
Français Vigne-vierge à cinq folioles Wikipedia: Wikipedia - English - Five-leaved Virginia creeper Wikipedia - Français - Vigne-vierge à cinq folioles Wikipedia - Deutsch - Selbstkletternde Jungfernrebe Wikipedia - Nederlands - Vijfbladige wingerd
Deutsch Selbstkletternde Jungfernrebe Wikispecies: Wikispecies - Parthenocissus quinquefolia
Nederlands Vijfbladige wingerd Back to the list of neophytes

Importance and distribution in Luxembourg

Distribution map of Parthenocissus quinquefolia (L.) Planch. in Luxembourg. Recorder database, MNHNL, 20.04.2019.

The Recorder database shows 7 observations in Luxembourg dating from 1958 to 2016 (18/01/2018).

General note on Parthenocissus spp.

Originally observed in man-made habitats, these popular garden plants can be found increasingly often in natural habitats like coastal dunes, riparian habitats and wood margins (Parthenocissus inserta) or rock outcrops (Parthenocissus quinquefolia). They usually thrive on nutrient-rich soils. Seeds are dispersed over long distances by birds. With its dense growth, the plant may cover, outcompete and kill native vegetation. Source: http://ias.biodiversity.be.

Risk assessment

ISEIA protocol: B1 (3+3+2+2), reassessed on 10 July 2018 by C. Ries and M. Pfeiffenschneider. Originally assessed together with Parthenocissus inserta as Parthenocissus spp. C1 (1+1+1+1) (Ries et al. 2013: 18).

Bibliography concerning Luxembourg

  • Ries, C., Y. Krippel, M. Pfeiffenschneider & S. Schneider, 2013. Environmental impact assessment and black, watch and alert list classification after the ISEIA Protocol of non-native vascular plant species in Luxembourg. Bull. Soc. Nat. luxemb. 114: 15-21. [PDF 652 KB]

 Last updated on Wednesday, July 11, 2018.

Parthenocissus inserta (Kerner) Fritsch

English False Virginia creeper ISEIA: B1 – Watch List
Lëtzebuergesch Gewéinleche Wëlle Wäin EASIN
Français Vigne vierge commune Wikipedia: Wikipedia - English - False Virginia creeper Wikipedia - Français - Vigne vierge commune Wikipedia - Deutsch - Wilder Wein Wikipedia - Nederlands - Valse wingerd
Deutsch Gewöhnliche Jungfernrebe Wikispecies: Wikispecies - Parthenocissus inserta
Nederlands Valse wingerd Back to the list of neophytes

Importance and distribution in Luxembourg

Distribution map of Parthenocissus inserta (Kerner) Fritsch in Luxembourg. Recorder database, MNHNL, 20.04.2019.

The Recorder database shows 4 observations in Luxembourg since the 19th century to 2016 (10/07/2018).

General note on Parthenocissus spp.

Originally observed in man-made habitats, these popular garden plants can be found increasingly often in natural habitats like coastal dunes, riparian habitats and wood margins (Parthenocissus inserta) or rock outcrops (Parthenocissus quinquefolia). They usually thrive on nutrient-rich soils. Seeds are dispersed over long distances by birds. With its dense growth, the plant may cover, outcompete and kill native vegetation. Source: http://ias.biodiversity.be.

Risk assessment

ISEIA protocol: B1 (3+3+2+2), reassessed on 10 July 2018 by C. Ries and M. Pfeiffenschneider. Originally assessed together with Parthenocissus quinquefolia as Parthenocissus spp. C1 (1+1+1+1) (Ries et al. 2013: 18).

Bibliography concerning Luxembourg

  • Ries, C., Y. Krippel, M. Pfeiffenschneider & S. Schneider, 2013. Environmental impact assessment and black, watch and alert list classification after the ISEIA Protocol of non-native vascular plant species in Luxembourg. Bull. Soc. Nat. luxemb. 114: 15-21. [PDF 652 KB]

 Last updated on Wednesday, July 11, 2018.

Spot the cherry laurel – A citizen science survey with children

The children magazine Panewippchen, edited for the members of the Panda-Club of the Luxembourg National Museum of Natural History, has published an interview with Dr Christian Ries, curator of the Department of Ecology:

  • Schaltz, Michèle, 2017. Fuerschung am ‘Natur Musée’: Ekologie. Panewippchen 4: 6-11. [PDF 2.2 MB]

The last page of the article suggests the young readers to participate to a citizen science survey concerning the recent spread into the wild of the cherry laurel (Prunus laurocerasus L.), a common garden plant in Luxembourg, mostly planted to build hedges. Fruits can be dispersed over long distances by birds.

Interested children are asked to look into the forests in their neighbourhood, the evergreen cherry laurel being very easy to spot in winter time, when trees and shrubs rejected their leaves.

The children are asked to send the following basic information to :

  1. How many cherry laurel individuals have been spotted?
  2. Where were they spotted (using GPS of portable devices)
  3. Observers name, age, address and email address.

 Last updated on Monday, January 8, 2018.

Ceratophyllum submersum L., a new species for Luxembourg

MNHNL22119

Herbarium specimen MNHNL22119 at the Luxembourg National Museum of Natural History.

Ceratophyllum submersum L., commonly known as the soft hornwort, is a submerged, free-floating aquatic plant.

A very dense submerged population of the soft hornwort has been discovered in a pond near Sanem on 21st June 2015 by German botanists Jörg Zoldan and Annette Steinbach-Zoldan during a survey for the nature conservation organization SICONA-Ouest. The pond had been artificially created in 2010.

In November 2015 specimens from this population have been deposited in the herbarium of the Luxembourg National Museum of Natural History. 1

Ceratophyllum submersum, Flora Batava Vol. 19, 1893. Wikimedia Commons.

Ceratophyllum submersum, Flora Batava Vol. 19, 1893. Wikimedia Commons.

 Last updated on Monday, February 27, 2017.

Notes:

  1. Herbarium number MNHNL22119.

Unnoticed invasion of Highways by halophyte Atriplex micrantha Ledeb.

The annual halophyte Atriplex micrantha Ledeb. (syn.: A. heterosperma Bunge) was first spotted in Hellange on 14 October 2007. By 2015, eight years later, it had colonized the median strip of huge parts of the Luxembourg highway network.

Read more in the post about Atriplex micrantha.

Atriplex_mi_Ries_small

Atriplex micrantha in the median strip of the A1 highway near Potaschberg, together with Senecio inaequidens. Curator Dr Christian Ries taking samples for the Museum herbarium. Photo: Dr Jim Meisch, 08.10.2015.

 Last updated on Wednesday, February 24, 2016.

Atriplex micrantha Ledeb.

English n/a ISEIA: C2
Lëtzebuergesch Grot Mëll EASIN
Français Arroche hétérosperme Wikipedia: Wikipedia - Deutsch - Verschiedensamige_Melde
Deutsch Verschiedensamige Melde Wikispecies: Wikispecies - Atriplex micrantha
Nederlands Grijze melde Back to the list of neophytes

Importance and distribution in Luxembourg

Distribution map of Atriplex micrantha Ledeb. in Luxembourg. Recorder database, MNHNL, 20.04.2019.

The annual halophyte Atriplex micrantha Ledeb. (syn.: A. heterosperma Bunge) was first spotted in Hellange (Municipality of Frisange) on 14 October 2007, in a roundabout at a construction site on controlled-access highway E29. 1

Since this single observation, the species managed unnoticed to invade the Luxembourg highway network, until a large population was spotted in summer 2015 in Potaschberg on the highway A1 between Trier and Luxembourg (Krippel & Colling 2016: 30). 2

A control in the field in autumn 2015 revealed the invasive plant grows in the median strip of the A1 almost from the German border until Luxembourg city in huge very dense populations 3, which confirms the Belgian point of view that “the species is still insufficiently known and widely neglected”. 4 Atriplex micrantha, which was dominant in the middle part of the median strip, occured together with the following species: Senecio inaequidens (dominant on the borders of the median strip), Mercurialis annua, Plantago intermedia, Prunus spinosa and Rosa rugosa.

On October 13th the species has been spotted along the Jersey barrier of highway A6 between the Belgian border and Mamer 5.

Since then, the species managed to travel north along the highway A7 until Colmar-Berg and the national highway B7 until Ettelbrück (Krippel et al. 2018: 60).

Atriplex micrantha is very salt-tolerant and benefits from the extensive use of deicing salt along motorways during winter. It probably arrived in Luxembourg via its large secondary distribution area in Germany, namely the A1 from Trier.

Atriplex micrantha Herbier MNHNL 2007

Specimen of the MNHNL Herbarium (Acc Nr. MNHNL 2011/47)

Atriplex micrantha in the median strip of the A1 highway near Potaschberg. Photo: Jim Meisch, 08.10.2014.

Atriplex micrantha in the median strip of the A1 highway near Potaschberg. Photo: Jim Meisch, 08.10.2014.

Atriplex micrantha in the median strip of the A1 highway, together with Senecio inaequidens. Photo: Jim Meisch, 08.10.2014.

Atriplex micrantha in the median strip of the A1 highway near Potaschberg, together with Senecio inaequidens. Photo: Jim Meisch, 08.10.2014.

Risk assessment

ISEIA Protocol: C2 (3+1+1+1). First assessed 16 February 2017 by Yves Krippel and Christian Ries.

Bibliography concerning Luxembourg

  • Krippel, Y. & G. Colling, 2016. Notes floristiques. Observations faites au Luxembourg (2014-2015). Bull. Soc. Nat. luxemb. 118 : 27-51.
  • Krippel, Y., T. Helminger & G. Colling, 2018. Notes floristiques. Observations faites au Luxembourg (2016-2017). Bull. Soc. Nat. luxemb. 120: 57-76. [PDF 265 KB]

Bibliography concerning neighbouring regions

  • Georges N (2006) Note sur deux nouvelles espèces de Chenopodiaceae adventices en Lorraine : Bassia scoparia (L.) Voss et Atriplex micrantha Ledeb. WILLEMETIA 48 : 1-4. [PDF]
  • Verloove F. (2006) Atriplex micrantha, een nieuwe neofyt langs belangrijke verkeerswegen in België. Dumortiera 88: 15-20.
  • Weicherding F.-J. (2007) Zur Verbreitung und Soziologie der adventiven Melden Atriplex micrantha Ledeb. (Verschiedensamige Melde), Atriplex sagittata Borkh. (Glanz-Melde) und Atriplex oblongifolia Waldst. et Kit. (Langblättrige Melde) (Chenopodiaceae) im Saarland und in angrenzenden Gebieten. Abh. Delattinia 33: 117-139.

http://euromed.luomus.fi/euromed_map.php?taxon=544848&size=medium

 Last updated on Wednesday, December 5, 2018.

Notes:

  1. Atriplex micrantha was first spotted in Luxembourg on on 14 October 2007 by German Horticulturist Franz-Josef Weicherding, St. Ingbert/Saar. He offered a specimen to the Herbarium of the MNHNL (Acc Nr. MNHNL 2011/47).
  2. Atriplex micrantha was spotted on 15 August 2015 by botanist Yves Krippel, scientific cooperator of the National Museum of Natural History.
  3. Control was done on 8 October 2015 by Dr Christian Ries and Dr Jim Meisch, curators at the National Museum of Natural History (WGS 84 6.41204, 49.68373). This “field trip” on the middle strip of an highway had to be coordinated with the highways unit of the department of civil engineering.
  4. Cf. Atriplex micrantha in the Manual of the Alien Plants of Belgium
  5. The plants were smaller (± 40-50 cm) than on the A1 (± 150 cm). Observation by Dr Christian Ries while driving car in the mentioned direction.

Spiraea ×billardii Hérincq

English Billard’s bridewort ISEIA: B1 – Watch List
Lëtzebuergesch Billard-Kluddertrausch EASIN
Français Spirée de billard Wikipedia: Wikipedia - Français - Spirée de billard
Deutsch Billards Spierstrauch Wikispecies: Wikispecies - Spiraea × billardii
Nederlands Billardspirea Back to the list of neophytes

Importance and distribution in Luxembourg

The first documented occurrence of Spiraea ×billardii in Luxembourg dates from 2011. It was found by Xavier Mestdagh on 27th June 2011 in the municipality of Parc Hosingen. Only five observations are indicated in the Recorder database.

The species is a sterile horticultural hybrid between S. alba et S. douglasii. It is a fast-growing rhizomatous species, propagating clonally, and mainly growing in ruderal areas and in riparian habitats. Just as other Spiraea species, it may easily form dense monospecific thickets smothering the native vegetation (Source: http://ias.biodiversity.be/species/show/142).

Risk assessment

ISEIA protocol: B1 (2+2+3+2) = Watch List, reassessed on 24 January 2019 by C. Ries and M. Pfeiffenschneider. Original assessment: B0 (2+2+3+2) = Alert List (Ries et al. 2013: 19).

Bibliography concerning Luxembourg

  • Ries, C., Y. Krippel, M. Pfeiffenschneider & S. Schneider, 2013. Environmental impact assessment and black, watch and alert list classification after the ISEIA Protocol of non-native vascular plant species in Luxembourg. Bull. Soc. Nat. luxemb. 114: 15-21. [PDF 652 KB]

 Last updated on Thursday, January 24, 2019.