Fig. 1
Heat map showing correlation coefficients among the measured plant traits and environmental gradients (the first principal component (PCA1) scores representing integrated environmental gradients of temperature, precipitation, and altitude), for the eight A. wilhelmsii accessions included in the common garden study. A principal component analysis of the three environmental variables extracted PCA1 as the dominant gradient explaining 80% of total variance across sites. PCA1 scores, incorporating contributions from all three gradients based on their loadings, were then used in place of individual variables. Soil pH and soil phosphorus were additionally measured from the collection sites to assess potential relationships with leaf phosphorus content observed in plants grown in the common garden experiment. Asterisks indicate statistical significance at the 0.05 (*) and 0.01 (**) levels.
