Quercus lusitanica

Quercus lusitanica, commonly known as Gall Oak, Lusitanian Oak, or Dyer's Oak, is a species of oak native to Morocco, Portugal, and Spain. Quercus lusitanica is the source of commercial nutgalls. These galls are produced by the infection from the insect Cynips gallae tinctoriae. They are used for dyeing.