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Summary

The effect of simulated acid rain on two populations of Senecio vulgaris was studied. Evidence suggests that the population from a relatively unpolluted area of the British Isles was more sensitive to applied dilute sulphuric acid than a population from east England, where a higher level of air pollution is likely. In making a cautious interpretation of our results, we point out that further studies are necessary before the hypothesis, that ecotypic differentiation occurs in response to acid rain, can be accepted.