Leaf surface flavonoids of Chrysothamnus (original) (raw)
Twenty-six¯avonoid aglycones have been identi®ed from eight plants covering three species of Chrysothamnus that were collected in eastern Oregon. The¯avonoids were identi®ed by NMR spectroscopy, tandem mass spectrometry and co-TLC with authentic markers. Chrysothamnus nauseosus yielded methyl ethers of apigenin, isoscutellarein, luteolin, kaempferol, herbacetin and quercetin. O-Methylated kaempferol and quercetin derivatives were isolated from the leaf exudate of C. humilis. Thē avonoid chemistry of C. viscidi¯orus was found dierent from the other two species by the presence of methyl ethers of quercetin, eriodictyol and taxifolin-3-acetate. Although the¯avonoid pro®les proved of diagnostic value at the species level, they provided little further evidence in favour of inclusion of Chrysothamnus into Ericameria as proposed earlier on the basis of morphological similarities. #
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