Article

Epidennal (stornata dimension and density) imd stem anatomical features (proportions of the various constituent tissues) have been studied for three Bulgarian representatives of Achillea sect. Filipendulinae: A. clypeolata, A. coarctata and A. thracica. Composition in flavonoid compounds of the leaf exudate was analysed for the same species, plus A. chrysocoma of A. sect. Santolinoideae. The results testify of various degrees of xeromorphic adaptation of the taxa studi ed.