Number of Portuguese (a) and Iberian (b) endemic plants per 10×10 km UTM square. The dataset used in the analysis corresponds to a total of 253,310 records. Note that low values do not necessarily mean absence of endemic species, as many areas are under-sampled (Figure 4a). Class breaks are manual. The dots are placed at the centre of WGS84 UTM squares. N.B. Iberian endemics (b) do not include Portuguese endemics.