Abstract: The morphology of floral nectaries in 10 sections,30 species of Swertia L.was examined through scanning electron microscopy(SEM).Furthermore the anatomy of nectaries of 11 species,representing 10 sections has been investigated through light microscopy(LM).It was shown that the morphologies of nectaries present a remarkabie diversity in number,shape and in the details of their opening and fimbriation,but they changed progressively and no interval in sections.

Key words: Swertia