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Illustration of the phylogenetic relationship of the major clades of eudicots, based on APG (2003). (A) Reconstruction of perianth differentiation in the basal eudicot grade and Gunnerales, in contrast to the supposedly staminodial petals of the core eudicots. (B) Reconstruction of petal homologies in the eudicots. The distribution of characters has been mapped for the major lineages of the core eudicots, indicating cases where petals have a staminodial or a bract-derived origin.
