Figure 2.

Regions of the Eucalyptus globulus complex used in this study. Regions are numbered (for further details see Table 1) and the color of the number corresponds to the morphological affinities of the region: blue = bicostata, yellow = maidenii, orange = maidenii–pseudoglobulus intergrade, red = pseudoglobulus, purple = bicostata–pseudoglobulus intergrade, dark green = globulus intergrade, light green = globulus. Intergrade region numbers are also italicized. The three major geographic barriers are shown in bold italics: the Murray Darling Depression (lowland plains with a warm, semi-arid climate), the Great Dividing Range (indicated by a dashed line), and the Bass Strait (channel that separates the island of Tasmania from the rest of Australia). Pie charts show the average proportion of membership of each of the 33 regions into each of the clusters (K = 4), from the STRUCTURE analysis of all sampled individuals of the E. globulus complex.