sentences:  The Mediterranean influence is felt in the presence of Holm oaks ("Quercus ilex") with bay laurel, which are situated on the warmest crests and slopes, especially above chalky soil, where the dryness becomes more pronounced.Improvement by humans has transformed much of this woodland into meadows, which conserve at their edges remnant hedgerows, "setos", of the species of the primitive forest.Clumps of thorny shrubs grow also in glades and clearings, such as the wild rose, blackberry bushes, blackthorn, hawthorn and other more or less thorny shrubs; this role can also be filled by smaller thorny plants, "los piornales", and clumps of broom.