Importance and distribution in Luxembourg
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 highway E29.
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).
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 , which confirms the Belgian point of view that “the species is still insufficiently known and widely neglected”.
On October 13th the species has been spotted along the Jersey barrier of highway A6 between the Belgian border and Mamer .
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.
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.
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, together with Senecio inaequidens. Photo: Jim Meisch, 08.10.2014.
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.
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.
Last updated on Monday, April 9, 2018.