In the present volume - the sixth of this series - 48 flowering
plant families comprising a total of 712 genera are treated. They
represent the newly designed eurosid orders Celastrales, Oxalidales
and Rosales and the asterid orders Cornales and Ericales. The
recognition of these ordinal concepts is the result of numerous
recent gene sequence analyses which, for the first time in
angiosperm systematics, have provided a reliable higher order
classification. The concept of Ericales is largely expanded beyond
its conventional limits to make it monophyletic and now includes
parts of the erstwhile Ebenales, Lecythidales, Primulales and other
orders. The revised circumscription of families such as Ericaceae,
Celastraceae and Cunoniaceae owes much to the application of recent
molecular studies, and for the same reason in the primulalean
families, a complete remodeling of family limits is proposed.
General
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