Priority Index in ornamental non-native plant species classified by their invasion status in Spain. P-values for Tukey’s range tests: not in the wild – casual: p = 0.981; not in the wild – naturalised: p = 0.860; not in the wild – invasive: p = 0.633; casual – naturalised: p = 0.958; casual – invasive: p = 0.748; naturalised – invasive: p = 0.953. Dashed red line represents the global median of Priority Index (=38). Species at or above this line should be considered in prioritisation, as shown in table 3.