Figure 2

Percentage cover of grass in low mean annual rainfall range (MAR≤630 mm y−1) as a function of wet-season rainfall frequency (λw). Colours indicate the seasonality index (SI): for increasing values of SI rainfall occurs in less months during the year. Continuous lines are the best model fit for grass (see Table 1) computed with the median value of SI (equal to 0.97, central line), the 95th percentile (equal to 1.3, lower line) and the 5th percentile (equal to 0.72, higher line).