The flavonoids of Xylonagra (onagraceae) |
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Authors: | John E. Averett Peter H. Raven |
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Affiliation: | Department of Biology, University of Missouri, St. Louis, MO 63121, U.S.A.;Missouri Botanical Garden, P.O. Box 299, St. Louis, MO 63166, U.S.A. |
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Abstract: | Xylonagra arborea is a monotypic genus of the tribe Onagreae of the Onagraceae. The species is restricted to the desert regions of central Baja California in western Mexico. Four flavonol glycosides, myricetin 3-O-glucoside, myricetin 3-O-rhamnoside, quercetin 3-O-glucoside and quercetin 3-O-rhamnoside were found to occur in methanolic leaf extracts of each of the populations sampled. The data are consistent with earlier investigations of leaf flavonoids in the Onagreae and suggest interesting changes in B-ring hydroxylation patterns within the tribe. |
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Keywords: | Onagraceae Onagreae flavonoids flavonols myricetin quercetin chemosystematics. |
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