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Fig. S1 Location of Oxalis compacta sites in the central Andes of Chile (33°S).

Fig. S2 Mean ± 2 SE for potential flower longevity (FL) measured in pollinator-excluded flowers and for actual FL measured in open-pollinated flowers in Oxalis compacta at six high-alpine sites in the central Andes of Chile.

Fig. S3 Relationship between relative humidity and 24-h temperature at 15 cm above ground level in the upper alpine zone, 3100–3470 m above sea level (asl), in the central Andes of Chile for the period in which flower longevity observations were made at six high-alpine sites in Oxalis compacta.