[4] The specific epithet "lusitanica" refers to the ancient Roman Province of Lusitania, corresponding roughly to present-day Portugal and Extremadura in Spain.

[5] Quercus lusitanica is a large semi-deciduous tree 10-15m in Height, It was incorrectly named Q. humilis, later Q. fruticosa and its current name was incorrectly used to identify other Gall oaks from the Iberian Peninsula and North Africa.

This resulted in numerous taxonomy errors in the Gall oaks taxa from the occidental and oriental Mediterranean Basin.

[1] Quercus lusitanica is native to the Iberian Peninsula (in Portugal and western Andalusia, Spain, also rare on Galicia) and Morocco[6] It is commonly associated in oak and pine forests and does well in acidic soils.

[6][9] No serious threats were found in Portugal, though in Andalusia this plant has been listed as Near Threatened due to fires, silviculture and grazing ungulates.