Abstract

SummaryClinal variation was studied in four populations of Dactylis marina Borrill from the Portuguese coast. Differences in the balance of leaf epidermal characters are found to be associated with differences in climatic conditions. In particular, the presence of epidermal papillae was found to affect the association between frequency of epidermal cells and stomata.The presence of a cline in papillosity, a character known to be recessive, suggests that this type of epidermal cell may play an important physiological role in the life of the plant.The effects of epidermal morphology are discussed, and suggestions made for further study.

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