This work presents the results of a study concerning the urban flora of Naples. The study was integrated with a careful bibliographic comparasion aimed at pointing out the presence of entities alredy signaled in other floristic works. The study regarded works published from the end of the eighteenth century to today. The whole floristic contingent of the urban areas in Naples is of 984 entities. Only 659 entities of this contingent belong to the present flora; for 178 of these entities we present the first report for the area under study. We did not find again 481 entities already reported for the same area. New data are besides reported on the distribution of Silene apetala Willd. and Eragrostis minor Host. The urban flora of Naples present middle mediterranean character (34,6%); togheter with antropic character emerging from the high presence of wide distribution species (34%) and the reduced presence of endemic entities (2,1 %).