The Angiosperm Phylogeny Group (APG) presents a revised classification of flowering plant families based on recent cladistic analyses. This classification includes 462 families in 40 putatively monophyletic orders and a few informal higher groups, such as monocots, commelinoids, eudicots, core eudicots, rosids, and asterids. Families not assigned to orders are listed, as well as families of uncertain position. The classification emphasizes phylogenetic relationships and aims to provide a reference tool for systematics and other biological fields. Orders are considered important for teaching and understanding family relationships, despite their historical lack of evolutionary coherence. The classification is based on molecular phylogenetic analyses and aims to reflect the current understanding of flowering plant phylogeny. It recognizes clades supported by multiple lines of evidence and avoids naming small, non-monophyletic groups. The classification also addresses the need for a phylogenetic classification that is both accurate and useful for communication. The APG classification is a modification of previous systems and incorporates recent findings, including the recognition of new orders and the reassignment of families. The classification is based on a broad circumscription of orders, with a focus on maintaining stability and avoiding redundancy. The classification includes a list of families of uncertain position, reflecting the current state of knowledge. The APG classification is a significant revision of previous systems and aims to provide a more accurate and useful classification of flowering plants.The Angiosperm Phylogeny Group (APG) presents a revised classification of flowering plant families based on recent cladistic analyses. This classification includes 462 families in 40 putatively monophyletic orders and a few informal higher groups, such as monocots, commelinoids, eudicots, core eudicots, rosids, and asterids. Families not assigned to orders are listed, as well as families of uncertain position. The classification emphasizes phylogenetic relationships and aims to provide a reference tool for systematics and other biological fields. Orders are considered important for teaching and understanding family relationships, despite their historical lack of evolutionary coherence. The classification is based on molecular phylogenetic analyses and aims to reflect the current understanding of flowering plant phylogeny. It recognizes clades supported by multiple lines of evidence and avoids naming small, non-monophyletic groups. The classification also addresses the need for a phylogenetic classification that is both accurate and useful for communication. The APG classification is a modification of previous systems and incorporates recent findings, including the recognition of new orders and the reassignment of families. The classification is based on a broad circumscription of orders, with a focus on maintaining stability and avoiding redundancy. The classification includes a list of families of uncertain position, reflecting the current state of knowledge. The APG classification is a significant revision of previous systems and aims to provide a more accurate and useful classification of flowering plants.