Rapid divergence in vegetative morphology of a wind-pollinated plant between populations at contrasting densities.

2a ) and to females from the low‐density treatment evolving to be ∼1.5 cm shorter than those from the source population (marginally significant effect of the source vs. low‐density treatments in models that included only females; Table 1 ; comparison III in Fig. 2a ).

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Among the many tests performed, some may be significant by chance, so we computed the expected number of false‐positive results at a 5% error rate.

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