Fig. 3.

Structural traits in different taxonomic groups: a stomatal density; b stomatal length; c maximum stomatal conductance (g _smax) calculated from stomatal density and length data (see Eq. 4); d wood density; and e leaf mass per unit area (LMA). Different letters represent significant difference between groups (P ≤ 0.05). Each data point represents the mean value of a species and thick black lines represent mean values of the taxonomic groups. GYM gymnosperms, MON monocots, ROS rosids, AST asterids