Forming a promenade, like a belt surrounding the peripheral arc of the Plaza, specimens of the genus Quercus (the Roman name for oaks and holm oaks) are arranged. This collection is a tribute to this genus of the Fagaceae, which brings together trees and shrubs that are key elements of the vegetation landscape across vast areas of the temperate regions of the Northern Hemisphere and which have provided so much utility and benefit to human communities, supplying firewood, timber, livestock fodder or food through acorns, and even products for dye extraction (kermes, a pigment obtained from the females of Kermes vermilio, a hemipteran insect that parasitises the leaves and branches of the kermes oak).

The taxa native to the Iberian Peninsula are located on the left side of the central path (pedunculate oak, Q. robur; Portuguese oak, Q. faginea; cork oak, Q. suber; Algerian oak, Q. canariensis; Atlantic holm oak, Q. ilex subsp. ilex; Mediterranean holm oak, Q. ilex subsp. ballota; and kermes oak, Q. coccifera). On the right, species from other parts of the world are represented, such as the Mount Tabor oak (Quercus ithaburensis subsp. macrolepis), easily recognisable by its large acorns, the Persian oak (Q. castaneifolia) and the Armenian oak (Q. pontica). There is also an oak native to China, Korea and Japan (Quercus acutissima), as well as North American oaks (Q. muhlenbergii and Q. macrocarpa), among others. Some of these species are evergreen, others are marcescent (retaining their dead leaves throughout autumn and winter and shedding them with the renewal of foliage in spring), and others are strictly deciduous.