Typical neutrocline and acidocline Quercus robur-Fraxinus excelsior forests with primrose, developed on silts, marls and clays, characterized by the presence of the ecological group of Arum maculatum, including Ranunculus ficaria, Ranunculus auricomus, Adoxa moschatellina, Ribes rubrum, Glechoma hederacea, Listera ovata, or of the group of Galium odoratum, with Rosa arvensis, Mercurialis perennis, Sanicula europaea, Melica uniflora, Ornithogalum pyrenaicum, or by the abundance of Lamium galeobdolon.