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External flavonoid aglycones ofViguieraseriesViguiera(asteraceae: heliantheae)

Authors
Journal
Biochemical Systematics and Ecology
0305-1978
Publisher
Elsevier
Publication Date
Volume
17
Identifiers
DOI: 10.1016/0305-1978(89)90096-3
Keywords
  • Viguiera
  • Heliantheae
  • Asteraceae
  • Flavonoids
  • Chemotaxonomy

Abstract

Abstract Distribution of external flavonoid aglycones supports other data to suggest that Viguiera series Viguiera (series Dentatae Blake) is a mixed taxonomic grouping. Two species, V. dentata and V. potosina, lack external flavonoid aglycones, whereas the remaining species of the series all produce external flavonoid aglycones and appear to form a natural taxonomic group. The latter group, which consists of species from Baja California and nearby xeric areas, exhibits a diversity of flavonoid types, with different diploid species variously producing flavonols, simple flavones, 6-methoxyflavones, 6-hydroxy,7-methoxyflavones and a chalkone as major compounds. Polyploid species exhibit combinations of flavonoid types from possible diploid ancestors. Compounds of the 6-hydroxy,7-methoxyflavone type appear to characterize the group of species from Baja California and nearby areas within Viguiera.

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