Atriplex micrantha Ledeb.

English n/a ISEIA: C2
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Report the species

Report Atriplex micrantha to the National Museum of Natural History.

Importance and distribution in Luxembourg

Distribution map of Atriplex micrantha Ledeb. in Luxembourg. Recorder-LUX & iNaturalist, 2019.08.26.

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

Suggested citation of this webpage

Ries, C. & M. Pfeiffenschneider (Eds.), 2019. Atriplex micrantha Ledeb. In: neobiota.lu - Invasive Alien Species in Luxembourg. URL: https://neobiota.lu/atriplex-micrantha/ [26.08.2019].

 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.