Botanical name: 

Oak galls (Quercus infectoria) are mentioned by Theophrastus (633) and other ancient writers, and they were prescribed by Alexander Trallianus (11) as a remedy in diarrhea. They are derived from varieties of the oak, Smyrna being one of the export points. In that city we have seen them in large quantities, in process of sorting for exportation. As an astringent, galls have long been employed in decoctions in domestic practice in the countries where they are obtained as excrescences on the oak.

The History of the Vegetable Drugs of the U.S.P., 1911, was written by John Uri Lloyd.