Orig. (Vítková et al. in Kolbek et al. 2003a: 273–277): Poo nemoralis-Robinietum Němec ex Vítková & Kolbek ass. nova Syn.: Poo nemoralis-Robinietum Němec 1981 (§ 3o)

Formal definition: Robinia pseudoacacia cover > 25.% AND (Avenella flexuosa cover > 25 % OR Brachypodium pinnatum cover > 50 % OR Poa nemoralis cover > 25 %) NOT group Acinos arvensis NOT group Alliaria petiolata NOT group Festuca pallens NOT group Urtica dioica NOT Arrhenatherum elatius cover > 25 % NOT Calamagrostis epigejos cover > 5 % NOT Holcus lanatus cover > 5 % NOT Melica transsilvanica cover > 5 % NOT Pinus sylvestris cover > 25 % NOT Quercus petraea agg. cover > 25 % NOT Urtica dioica cover > 5.%