Abstract
A study on urban plant diversity of Catania city (Sicily, Italy) was carried out through the analysis of urban green space network and natural habitats. The study area is extended to 939 km(2) and includes 15 km of coastal habitat. Floristic data were used to analyze environmental changes. The vascular plant flora was investigated through a literature list for periods from 1889 to 1909 and from 1970 to 1990 and through an extensive survey campaign from 2010 to 2017. A total list of 927 species was acquired. Each species was associated with its own ecological and chorological information. Ellenberg's values were used as environmental indicators to assess the relationship between plant species and environmental factors.