The article provides a discussion of principles of high-rank classification of angiosperms from the viewpoint of a new vision of the angiosperm phylogeny based on molecular phylogenetic and traditional data. It is argued that recognition of both monophyletic and paraphyletic taxa should be recommended at the supraordinal levels. Angiosperms are recognized as a division Magnoliophyta, with three classes, Magnoliopsida (basal angiosperms, with subclasses Nymphaeidae and Magnoliidae), Liliopsida (monocots, with subclasses Alismatidae, Liliidae, and Commelinidae), and Rosopsida (eudicots, with subclasses Ranunculidae, Hamamelidae, Rosidae, Caryophyllidae, and Asteridae). A comparison table is provided showing correspondence of these taxa and units recognized by other recent systems (APG III, 2009; Chase & Reveal, 2009, Takhtajan, 2009; Shipunov, 2013). A synopsis of families and orders of angiosperms occurring in Ukraine (native and widely cultivated plants) contains 174 recognized families placed in 70 orders. In cases of different circumscription of families and orders, comments are provided in favor of the adopted circumscription. The orders and families recognized here are mainly more narrowly circumscribed than those in the APG system.
Keywords: angiosperms, flowering plants, system, phylogeny, nomenclature, flora of Ukraine, Angiosperm Phylogeny Group
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