It looks most like what used to be called Q. ilex subsp. rotundifolia, but in fact Quercus ilex is so variable across its range that nowadays all the variations that used to be considered as either subspecies (ballota, gracilis, montserratensis - not to be confused with Q. monserratensis, a deciduous species from Salvador! - and rotundifolia) or the multitude of named "vars" have been merged into the single species, with no subspecies or vars. Makes identification much less of a minefield!