The Botanical Garden of Ferrara holds a Herbarium with dried plants that bear witness to the close link between the city , the University Estense and the Botanical sciences . The Herbarium , although small in size, is home to about 16,000 copies distributed between ancient and modern collections of lower and higher plants . As for the major herbaria in the world has received official recognition by the international scientific community , and is registered in the Index Herbariorum ( the official catalog of all public herbaria in the world) with the acronym ERF.