Flavonoids of four species of Parthenium (compositae) |
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Authors: | M.C. Shen E. Rodríguez Kathleen Kerr T.J. Mabry |
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Affiliation: | The Cell Research Institute and Department of Botany, The University of Texas at Austin, Austin, TX 78712, U.S.A. |
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Abstract: | Kaempferol and quercetin 3-O-glycosides were found in the closely related species, Parthenium hysterophorus, P. bipinnatifidum and P. glomeratum; the major aglycone flavonols in P. hypterophorus are quercetagetin 3,7-dimethyl ether and a new flavonoid, 6-hydroxykaempferol 3,7-dimethyl ether. The North-South American species-pair P. glomeratum (Argentina) and P. bipinnatifidum (Mexico) yielded quercetagetin 3,7,3′-trimethyl ether as the major aglycone. The desert species P. rollinsianum yielded five methylated flavonols: quercetin 3,3′-dimethyl ether, penduletin, quercetagetin 3,6,7-trimethyl ether, polycladin and artemetin. |
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Keywords: | Compositae North-South American disjunctions quercetin 6-hydroxykaempferol and quercetagetin methyl ethers. |
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