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 Flavonoids are common in Bryophytes (mosses and hepaticas).

 The structural variety of flavonoids in Equisetales is characterized by
proanthocyanins. O-glycosides of flavonols dominate in Filices, some of
which also elaborate chalcones or proanthocyanins.
 In Gymnosperms, proanthocyanins are remarkably ubiquitous.
 It is in the Angiosperms that the structural diversity of flavonoids is
maximal: indeed about thirty flavonoid types have been identified in the
Asteraceae.

 Flavonoids also widely occur in Fabaceae,
Polygonaceae and Rosaceae.
 Content of flavonoids varies from 0.1% to 20%. Flower buds
of Sophora japonica , just before blossoming, contains 15 to 20%

 rutin.
 Among flavonoids percentage of flavonoles is approximately 40%.
Rutin, i.e., is detected in above 70 species of 34 families, quercetin- in
400 species.

Distribution of flavonoids