Before man started influencing the landscape, oak forests covered almost the whole of the northwest Iberian Peninsula. Today they continue to be the most abundant natural (non-planted) type of woodland in the Park, although only being a fraction of what they were in the past. These woodlands are dominated by the common or pedunculate oak (Quercus robur) and/or the Pyrenean oak (Quercus pyrenaica) (habitat 9230).
In the oak wood that we are looking at, an altitude of over 1,100 metres, practically the only species here is the Pyrenean oak (which gradually substitutes the common oak above 700-800 metres altitude). Pyrenean oak woods have a less diverse flora than their common oak counterparts. Nevertheless it is possible to see species such as holly (Ilex aquifolium), bilberry (Vaccinium myrtillus), ivy (Hedera helix), dogtooth violet (Erythronium dens-canis) and the wood anemone (Anemone trifolia subsp. albida).