Abstract
Blue flowers occur in those taxa of the angiosperms which are characterized by an evolutionary trend towards the herbaceous habit. They are relatively rare in the more primitive groups of both the dicots and the monocots and are much more frequent in the more highly advanced subclasses, the Asteridae, Commelinidae and Liliidae. These facts can be rationalized by considering the changes in flavonoid chemistry known to accompany the evolution of woody to herbaceous forms with respect to the chemical composition of the blue pigment complexes.
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