Abstract
Seven species of Layia, belonging to four of the species groups recognized by Clausen, Keck and Hiesey in 1941 were examined for their external flavonoid aglycone contents. Seven flavonoid aglycones, six of which were flavones and one of which was a 3-methylated flavonol, were found in the profiles. In addition, the coumarin, scopoletin, was found in all seven species. Layia carnosa and L. chrysanthemoides lack flavonoid aglycones. Layia glandulosa and L. platyglossa have identical profiles, suggesting a phytochemical continuum between the n - 7 and n -- 8 species groups. Layia hieracioides and L paniculata produce both flavones and the methylated flavonol. Layia septentrionalis differs from the other glandular species in lacking the methylated flavonol.
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