Flavonoid systematics of seven sections of ludwigia onagraceae

Averett, J.E.; Raven, P.H.; Zardini, E.

Annals of the Missouri Botanical Garden 74(3): 595-599


ISSN/ISBN: 0026-6493
DOI: 10.2307/2399327
Accession: 005466946

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Data are presented for the flavonoids of 24 speceis and seven sections of Ludwigia, all of which previously had been grouped in sect. Myrtocarpus. A total of eight flavonoids, three glycoflavones, and five flavonol glycosides based on quercetin was found in these species. Seven compounds, all but one acylated glycoflavone, are present in species of the revised sect. Myrtocarpus. The monotypic sections Tectiflora and Humboldtia have only flavonols, and the monotypic sections Amazonia and Heterophylla have only glycoflavones. Sections Pterocaulon and Cinerascentes have both flavonols and glycoflavones. Morphologically, sect. Myrtocarpus has the most generalized features within Ludwigia, which suggests that the presence of both glycoflavones and flavonols is a primitive feature for the genus as a whole. The lack of one or the other of these groups of flavonoids in four of the monotypic sections reported suggests that these sections are advanced in this feature, as does a general reduction of structural types and a reduction in the number of glycosidic substitutions in them.