Number of naturalized species for each of the five mediterranean-climate regions (a), number of species occurring in more than one of the five regions with indication of their percentage in parenthesis (b), and pooled number of species (c).

Areas in 106 km2 (Cowling et al. 1996): California = 0.32; Chile = 0.14; Mediterranean Basin = 0.93 (for the 4 countries studied); South Africa = 0.09 SW Australia = 0.31. The geographical distribution of the five MCRs included in this study is depicted in citation [13].