Evolution of floral traits and mating systems under drought: a range-wide study of <i>Mimulus cardinalis</i>.

Regional and temporal effects on floral traits Nectar traits: sugar concentration and volume Nectar sugar concentration varied significantly among regions, with a marginally significant interaction between region and cohort but no significant main effect of cohort ( Table 1 ).

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Results Correlations among variables Pearson correlation coefficients revealed a weakly significant negative relationship between nectar volume and nectar sugar, and a weakly negative correlation between nectar sugar and herkogamy; all other relationships between response variables were not significant ( Supplementary Figure S1 ).

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