Pseudo-Galen, al-Adwiya 'l-maktūma, with the commentary of Hunayn ibn Ishāq

Medieval Arabic bibliographers report the existence of a treatise attributed to Galen and commented upon by Hunayn bearing the title al-Adwiya almaktūma ("The Hidden Drugs"), but no copies were known to exist. We have identified, and publish here for the first time, an incomplete copy, transcribed into Hebrew characters. It turns out that this is the text later translated into Latin and published in the Renaissance under the title De plantis. A comparison between the Latin and Arabic texts, as well as a discussion of the material medica to the extent that we have been able to identify them, are also provided.