Angiosperm Phylogeny Group

The Angiosperm Phylogeny Group is an international collaboration that publishes flowering-plant classifications based on evidence including DNA.

APG I: The Angiosperm Phylogeny Group's first classification of flowering plants, published in 1998. It introduced the group's molecularly informed approach to a broad botanical audience.
Phylogenetics: The study of evolutionary relationships among organisms or genes. The group uses phylogenetic evidence to organize flowering plants into lineages.
Angiosperm Phylogeny Group I: The 1998 scientific paper presenting the Angiosperm Phylogeny Group's first flowering-plant classification. This foundational publication established the collaboration's first consensus system.
Kew Plants of the World Online: A Kew database providing information on plant names, distributions, and taxonomy. Its accepted plant names and higher classification draw on contemporary taxonomic frameworks.
Cronquist system: A flowering-plant classification developed by Arthur Cronquist using morphological and anatomical evidence. It predates APG and differs in several major groupings, including traditional dicotyledons.
APG II: The Angiosperm Phylogeny Group's second flowering-plant classification, published in 2003. It revised the first system and allowed several families to remain unplaced within orders.
Molecular phylogenetics: The inference of evolutionary relationships from molecular sequence data. DNA comparisons provide much of the evidence behind the group's classifications.
Angiosperm Phylogeny Group II: The 2003 scientific paper presenting the Angiosperm Phylogeny Group's second classification. Its revisions responded to new evidence and unresolved family placements.
World Flora Online: An international online compendium of the world's known plant species. Global plant inventories require a consistent framework for organizing flowering-plant families.
Takhtajan system: A classification of flowering plants developed by Armen Takhtajan, emphasizing evolutionary relationships and morphology. Its more finely divided orders and families contrast with APG's consensus framework.

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