Abstract
Flavonoids of 42 species of Tradescantia were analysed. The predominant compounds found were C-glycosideso f apigenin and luteolin. Glycosides of flavonols, 6-hydroxyluteolin and tricin were also present, though with less frequency. The distribution of these compounds allowed the arrangement of the genus in three groups following the geographical distribution of the species. The T. virginiana alliance, living in North America, differed from the other two groups by having sulphated phenolic acids in all the species examined. The T. crassifolia alliance from Mexico and T. ambigua from South America can be clearly separated from the other two alliances by the presence of 6-hydroxyluteolin glycosides. The T. fluminensis alliance is exclusively South American and is defined by possessing C-glycosides in all the species examined. Although the flavonoid distribution in the T. crassifolia alliance does not support the sectional classification, it coincided with the division of the genus into three alliances.
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