Table 1. Results of the pairwise comparisons between the spatial distributions of native species vs. four groups of alien species (archaeophytes, all neophytes, non-invasive neophytes and invasive neophytes) for urban floras of mainland Europe, Italy, and the British Isles.

	Mantel correlation
Species Groups	Mainland Europe	British Isles	Italy
Natives vs. Archaeophytes	0.388*	0.797**	—
Natives vs. Neophytes	0.468*	0.638**	0.819**
Native vs. Invasive Neophytes	0.567*	0.693**	0.852**
Natives vs. Non-invasive Neophytes	0.452*	0.609**	0.793**

The significance levels are: **  = P<0.01; *  = P<0.05.