Density curves comparing the median (1st column), range (2nd column) and skewness (3rd column) of plot-size adjusted species richness (Sc) of naturalised neophytes with all other species in (a) forests and (b) grasslands. The dotted black line indicates the mean of Sc values for each parameter across all species in the vegetation formation. The solid black line indicates the mean of the Sc values for each parameter of each species group. The tick marks on the left and right margins show the Sc values for each parameter of individual species in each group. Density values of naturalised neophytes were multiplied by -1 to facilitate visual comparisons. The range and skewness of Sc were standardised (Std.) as described in the Methods section. P-values correspond to Mann-Whitney U Tests.