APG system

Source: Wikipedia, the free encyclopedia.

The APG system (Angiosperm Phylogeny Group system) of plant classification is the first version of a modern, mostly molecular-based, system of plant taxonomy. Published in 1998 by the Angiosperm Phylogeny Group, it was replaced by the improved APG II in 2003, APG III system in 2009 and APG IV system in 2016.

History

The original APG system is unusual in being based, not on total evidence, but on the

dicotyledons
.

The system is rather controversial in its decisions at the family level, splitting a number of long-established families and submerging some other families. It also is unusual in not using

monocots, eudicots, rosids, asterids
.

The APG system was superseded in 2003 by a revision, the APG II system, in 2009 by a next revision, the APG III system, and then in 2016 by a further revision, the APG IV system.

Groups

The main groups in the system (all

unranked clades
) are:

Representation in color

The APG system recognises 462 families and 40 orders: these are assigned as follows. In the beginning of each listing some families or orders that are not placed in a further clade:

Note: "+ ..." = optional seggregrate family, that may be split off from the preceding family.

See also

References

  • The Angiosperm Phylogeny Group (1998). "An ordinal classification for the families of flowering plants". Annals of the Missouri Botanical Garden. 85 (4): 531–553.
    JSTOR 2992015. (Available online: (PDF)
    )

External links
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