Archaeobotany in Florence (Italy): Landscape and urban development from the late Roman to the Middle Ages.

Archaeological excavations in Florence (Italy) offered the opportunity of collecting archaeobotanical data along stratigraphic sequences and pits from late Roman to Middle Ages; until now, no archaeobotanical data of this range of time were available for Florence. To achieve a more comprehensive reconstruction of the antique landscape and of the plant uses in the city, the results of plant micro- and macro-remain analyses were compared. During the late Roman Period, mixed oak forests covered the surrounding hills, while only scattered riverine thickets grew in the Arno river plain, which was mostly open. In the city, the increase in richness of cultivated plants, weeds and ruderals follows the advancement of urbanization from the late Roman to the Middle Ages when the abundance of remains of cereals, figs, grapevines and other fruits showed that cultivation and/or food processing were performed close to and even within the town wall. Peaks of heather (Erica spp.) pollen suggested that its flowering branches were introduced in the site and possibly used as building material or for the maintenance of the Arno river bank. Thus, this integrated archaeobotanical approach provided new insights into the environmental and ethnobotanical history of Florence, highlighting the occurrence of horticulture within the city wall.