Sub-Atlantic and medio-European forests of Quercus robur and Quercus petraea, on meso-oligotrophic and less hydromorphic soils, characterized by the replacement of the groups of Primula elatior and Lamium galeobdolon by those of Deschampsia flexuosa and of Maianthemum bifolium, transgressives from the Quercion.
Typical formations of northern Europe, the eastern Paris basin and Lorraine, with Stellaria holostea, Carex brizoides, Narcissus pseudonarcissus, Polygonatum verticillatum, Potentilla sterilis, Ranunculus nemorosus, Poa chaixii, Luzula sylvatica, L. luzuloides.