Beschreibung:
<jats:title>Abstract</jats:title><jats:p>Amounts and patterns of phenotypic plasticity were measured for seven populations of the Texas annual <jats:italic>Phlox drummondii</jats:italic>. Individuals from each population were grown in a factorial greenhouse experiment involving five treatments: control, low water, leaf removal, low nutrients, and small pots. Ten traits, representing aspects of biomass, shape, reproduction, and allocation, were measured for each plant. Results of two‐way ANOVA (population by treatment interaction) indicated variation in plasticity for 6 of the 10 traits. Pairwise two‐way ANOVAs on these traits allowed identification of the particular populations responsible for the overall population by treatment interactions. Five populations had relatively similar plastic responses, while two populations differed substantially from the others. The patterns of plasticity of certain traits (e.g. root/shoot ratio) showed very little divergence among populations compared to other traits. Divergence among populations based on the plasticities of traits differed substantially from the pattern of divergence based on trait means, indicating that the plastic responses of traits are able to evolve independently of the traits themselves.</jats:p>