Properties of the leaf surface associated with wettability were studied in ecotypes of Agrosti stolonifera from salt marsh, spray zone and inland habitats. The maritime ecotypes retained much less salt than the inland ecotype after immersion in salt water. Retention of salt after spraying was highest by leaves of the inland ecotype and least by those of the spray zone ecotype. Differences in retention of salt can be correlated with differences in wettability (indicated by measurement of advancing contact angle) and these differences are, in turn, related to differences in the structure and distribution of extracuticular waxes on the surfaces of leaves of the ecotypes. The differences are considered to be adaptations to the environments in which the ecotypes grow.