Stomatal types in Icacinaceae. Additional observations on genera outside Malesia

The stomatal types of most Icacinaceous genera (28) outside Malesia are reported for a limited number of species. In addition to the stomatal types recognized in Malesian Icacinaceae in an earlier paper, complex cyclocytic stomata are recorded in some genera, notably Leretia, for the first time. A fairly comprehensive survey of the genus Citronella indicates some trends of differentiation between the Asiatic and Pacific species and the American and Australian species. The results are further discussed with reference to previous hypotheses on level of specialization and stomatal types.