Abstract
A list of flavonoids of 22 taxa of Syngonanthus Ruhl. (Eriocaulaceae) is presented. The specimens are distributed chiefly in areas of 'campos rupestres' of the States of Minas Gerais and Bahia (Brazil). Only flavone glycosides were obtained. Among the Eriocaulaceae, the results bring Syngonanthus close to Leiothrix and distinguish both taxa from Eriocaulon, a genus known to possess flavonols. At the infrageneric level, the flavonoid chemistry suggests a pairwise arrangement of the four sections of Syngonanthus, combining on the one hand Carpocephalus and Dimorphocaulon, and on the other hand, Eulepis and Thysanocephalus. Support for this realignment is provided by the exclusive finding of derivatives of 6- hydroxyluteolin in species of the former pair of sections and the nearly exclusive presence of C-glycosides of luteolin and galactose-containing O-glycosides in species of the latter pair.
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