Differences in height (a), leaf area (b), specific leaf area (c), root diameter (d) and specific root length (e) amongst the functional groups considered in this study. Functional groups are abbreviated as follows: EF – exotic forb, EG – exotic graminoid, NF – native forb, NG – native graminoid, NS – native shrub. Points represent means and lines 95% confidence intervals. Solid grey horizontal lines denote the mean trait values for leafy spurge (Euphorbia esula).