Riparian alder or ash-alder woods of collinar and montane streams of the northern Iberian peninsula, with a pronounced medio-European influence marked in particular by the presence of Fraxinus excelsior (and not Fraxinus angustifolia). They are characteristic of streams originating in the Pyrenees, the Cantabrian Cordillera, the Northern Galician mountains and the Catalonian ranges. The canopy may include Ulmus glabra, Quercus robur and tall willows; the undergrowth contains Sambucus nigra, Corylus avellana, Cornus sanguinea, Rubus caesius, Carex pendula, Carex remota, Festuca gigantea, Bromus ramosus, Lathraea clandestina, Circaea lutetiana, Hypericum androsaemum, Solanum dulcamara, Valeriana pyrenaica, Lysimachia nemorum, Saxifraga hirsuta, Galanthus nivalis, Athyrium filix-femina, Dryopteris dilatata, Osmunda regalis, Equisetum telmateia.