The BUCF Herbarium stores 253 specimens of allochthonous oaks species belonging to 33 accepted taxa. Amongst the representatives, Quercus rubra has the most recordings. Moreover, three species classed as near threatened on the IUCN Red List were identified. The most significant contribution was made by the botanist S. Pașcovschi who amassed approximately one-third of the collection. The specimens were collected between 1872 and 1987, with a maximum activity between 1940 and 1949. The majority of the specimens were sampled from dendrological parks and botanical gardens in Romania, the Bazos Dendrological Park remarking itself with one of the most diverse collections of cultivated oaks. A considerable number of specimens were received from donations and exchanges with several herbaria. Most of the herbarium material is very well-preserved having high potential for future investigations.