Leaf anatomy of Richterago species revealed rather variability concerning mesophyll organization and stomata arrangement. As a character of taxonomic value, only non-glandular thricomes were used to compare R. arenaria and R. lanata,R. conduplicata and R. radiata, whose leaves are morphologically similar. Anatomical xeromorphic characters, e.g. the bundles sheath extensions and terminal tracheids were observed in all species. The waterside species (R. polymorpha e R. riparia) showed hydathodes in the leaves, which represent the first record in Mutisieae.
leaf anatomy; Richterago; Asteraceae
