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 Flavonoids are ubiquitous in the leaf cuticle and

epidermal cells where they ensure tissue
protection against the damaging effects of UV radiation.

 In flowers, they are concentrated in epidermal cells.
The glycosidic forms of flavonoids are water-soluble,

accumulate in vacuoles, and depend on the species.

 Flavonoids in the broad sense of the term are virtually
universal plant pigments. Almost always water-soluble,
they are responsible for the color of flowers, fruits,

and sometimes leaves. Examples are yellow flavonoids
(chalcones, aurones, and yellow flavonols) and red, blue,

or purple anthocyanins. Anthocyanins, whose vivid colors
attract insects and birds, play a major role in pollination
and seed dispersal.

Location, biological functions in plants