Abstract
Species of Achillea sect. Achillea and A. sect. Babounya were studied for their exudate flavonoid aglycone profiles. The leaf washes of these xerophytes contained primarily methyl ethers of 6-hydroxyflavones and of 6-hydroxyflavonols as the main phenolic constituents. The species specifity of flavonoid patterns was checked by analysis of various strains, including cultivated material of the same origin. Within the larger sect. Achillea, species did not show significant qualitative differences in their flavonoid composition, which is contrary to morphological divergences observed. Conversely, the profiles within the small sect. Babounya exhibited species specifity, although morphological differentiations are less obvious. Also, the study includes discussions on botanical diversifications in both sections. The ecological significance of external aglycone formation in xerophytes is discussed.
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