Exudate flavonoids in species of Artemisia (Asteraceae—Anthemideae): new results and chemosystematic interpretation

Abstract

Nine species belonging to various taxonomic units within the genus Artemisia were studied for their exudate flavonoid composition. In addition to 49 different flavones, flavonols, flavanones and dihydroflavonols, a coumarin and a phloroacetophenone were also found as exudate constituents. The majority of flavonoids exhibited 7,3′- or 7,4′-substitution, whereas 6-substitution was rather rare. Similarly, higher substituted derivatives were shown to be of rare occurrence in the species studied. Some aspects of chemosystematic relevance are shortly discussed, and the substitution trends of the various flavonoid groups are discussed in a biosynthetic context.