ABSTRACT
Species diversity of the tree flora of 38 districts in the Greater Cairo city was studied with reference to landscape differentiation of species make-up. Three main habitats including 14 sites with 263 sample plots were considered [35 urban parks, 76 road islands and 152 street verges]. In total, 378 of vascular plant species belonging to 264 genera and 79 families were recorded in urban areas of the Greater Cairo city. The most species-rich [44.7%] families were Fabaceae [36 spp.], Asparagaceae, Poaceae [21 spp.], Moraceae [19 spp.], Asteraceae [17 spp.], Euphorbiaceae and Malvaceae [15 spp.], Arecaceae [14 spp.], Lamiaceae [11 spp.], whereas the remaining families [70] constituted together 193 species. Ficus [18 spp.] was the highest among the species-rich genera, followed by Euphorbia [11 spp.], Asparagus, Brachychiton, Callistemon, Citrus and Pinus [4 spp, each]. 257 genera contained only 1-3 species e.g. Cereus, Koelreuteria, Strelitzia, Terminalia, Carica and Toona. Growth form spectra revealed that, the recorded trees [139 spp.] belonged to 32 families; shrubs [79 spp.] to 30 families, herbs and others [160 spp,] to 48 families