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Background  This research was performed in an area belonging to the province of the city of Bologna (Emilia-Romagna region, Northern Italy). The purpose of the present survey was to record the local knowledge concerning traditional uses of wild food plants and related practices, such as gathering, processing, cooking, therapeutic uses, with the aim of preserving an important part of the local cultural heritage.    Methods  Thirty-nine people still retaining Traditional Local Knowledge (TLK) were interviewed between March-April 2012 and September - October 2013 by means of open and semi-structured ethnobotanical interviews. For each plant species mentioned, we recorded the botanical family, the English common name, the Italian common and/or folk names, the parts of the plant used, the culinary preparation, and the medicinal usage. The relative frequency of citation index (RFC), a tool that measures the local cultural importance of a plant species, was also included.    Results  The folk plants mentioned by the respondents belonged to 33 botanical families, of which the Rosaceae (14 plants) and the Asteraceae (9 plants) were the most representative. The species with the highest RFC index (0.77) were  Crepis vesicaria  subsp.  taraxacifolia  (Thuill) Thell and  Taraxacum officinale  Weber. Eleven folk plants were indicated as having therapeutic effects.  T. officinale  Weber,  C. vesicaria  subsp.  taraxacifolia  (Thuill) Thell and  Sonchus  spp., which are used as food, were reported to be depurative, blood cleaning, refreshing, diuretic and laxative. The most commonly used species was  Urtica  spp, which was also the most frequently cited for medicinal uses.    Conclusions  The present survey documented the wild food plant traditional knowledge of an area belonging to the province of the city of Bologna (Emilia-Romagna region, Northern Italy). The general perception obtained is that on one side the TLK related to wild food plants has strongly been eroded, mainly due to immigration and urbanization phenomena, whereas on the other side these plants are revaluated today because they are perceived as healthy and also because they represent the preservation of biodiversity and a way of getting back to nature.    Electronic supplementary material  The online version of this article (doi:10.1186/1746-4269-10-69) contains supplementary material, which is available to authorized users.

Wild food plants traditionally consumed in the area of Bologna (Emilia Romagna region, Italy)