Abstract
An experiment was conducted to determine if leaves of Rumex acetosella changed size or shape when under drought stress, and if leaves of plants taken from a xeric environment responded differently to drought stress than leaves of plants from a mesic environment. Mean leaf areas were significantly larger in plants from xeric populations in both dry and control treatments. The five largest leaves of each control individual were significantly larger on xeric plants and on those plants whose clone had survived the low moisture stress. Multivariate analyses indicated no leaf shape differences between moisture treatments or between habitat of origin. The results suggest a physiological rather than a morphological basis for drought tolerance in R. acetosella.
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