Fig. S1 Photograph of the rainout shelters used in this study.

Fig. S2 Microclimate beneath the rainout shelters.

Fig. S3 Ambient environmental variables measured over course of the 3-yr experiment.

Fig. S4 Flowering trends, for those species with visible flowers, over the course of the experiment.

Fig. S5 Soil moisture in bare soil and beneath restioids following a cloud moisture event.

Table S1 Comparison of long-term rainfall averages (1956–2008) with rainfall measured during this study

Table S2 Number of days between rain events and number of cloud days

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