Abstract
With ca 70.000 species the rosids contain more than a quarter of the total angiosperm species diversity. This taxonomic richness is reflected in a tremendous variety of floral organization and architecture. Rosids have received extensive molecular phylogenetic study. As a result, the monophyly and taxonomic composition of the group are well established. In addition, many subclades at the order level are now apparent. Deeper relationships, however, are still largely equivocal. As in many other parts of the plant tree of life, it will be impossible to reach an adequate understanding of the evolutionary history of the rosids without taking into account information from comparative morphological studies of extant and, in particular, also of fossil taxa. The fossil record of rosids is rich in well-preserved reproductive structures, and together with recent results from comparative studies of extant rosids, provides a wealth of floral structural data. Although much remains to be done at all levels, fresh attempts to synthesize and possibly reconcile results from molecular phylogenetics, comparative floral morphology, and palaeobotany, seem timely.
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Schönenberger, J., Balthazar, M.v. Reproductive structures and phylogenetic framework of the rosids - progress and prospects. Plant Syst. Evol. 260, 87–106 (2006). https://doi.org/10.1007/s00606-006-0439-4
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DOI: https://doi.org/10.1007/s00606-006-0439-4