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P50 versus aridity index in herbs and woody species. Herbaceous and woody species that are more resistant to embolism formation (more negative P50) grow in drier environments (lower aridity index; Julve, 1998). P50 values were averaged for each plant group every 2 MPa (light-green diamonds, grasses; dark-green triangles, herbaceous eudicots; orange circles, woody angiosperms; brown triangles, woody gymnosperms). Error bars show se.
