APG II system

System of plant taxonomy

The APG II system (Angiosperm Phylogeny Group II system) of plant classification is the second, now obsolete, version of a modern, mostly molecular-based, system of plant taxonomy that was published in April 2003 by the Angiosperm Phylogeny Group.[1] It was a revision of the first APG system, published in 1998, and was superseded in 2009 by a further revision, the APG III system.

History

APG II was published as:

  • Angiosperm Phylogeny Group (2003). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG II". Botanical Journal of the Linnean Society 141(4): 399-436. (Available online: Abstract | Full text (HTML) | Full text (PDF) doi: 10.1046/j.1095-8339.2003.t01-1-00158.x)

Each of the APG systems represents the broad consensus of a number of systematic botanists, united in the APG, working at several institutions worldwide.

The APG II system recognized 45 orders, five more than the APG system. The new orders were Austrobaileyales, Canellales, Gunnerales, Celastrales, and Crossosomatales, all of which were families unplaced as to order, although contained in supra-ordinal clades, in the APG system. APG II recognized 457 families, five fewer than the APG system. Thirty-nine of the APG II families were not placed in any order, but 36 of the 39 were placed in a supra-ordinal clade within the angiosperms. Fifty-five of the families came to be known as "bracketed families". They were optional segregates of families that could be circumscribed in a larger sense.

The APG II system was influential and was adopted in whole or in part (sometimes with modifications) in a number of references. It was superseded 6½ years later by the APG III system, published in October 2009.

Groups

Cladogram showing the relationships, but excluding taxa not placed within an order

Main groups in the system (all unranked clades between the ranks of class and order):

Shown below is the classification in full detail, except for the fifteen genera and three families that were unplaced in APG II. The unplaced taxa were listed at the end of the appendix in a section entitled "Taxa of Uncertain Position". Under some of the clades are listed the families that were placed incertae sedis in that clade. Thirty-six families were so placed. This means that their relationship to other members of the clade is not known.

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

References

  1. ^ Angiosperm Phylogeny Group (2003). An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG II. Botanical Journal of the Linnean Society 141(4): 399-436. doi: 10.1046/j.1095-8339.2003.t01-1-00158.x
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This is a selected list of the more influential systems. There are many other systems, for instance a review of earlier systems, published by Lindley in his 1853 edition, and Dahlgren (1982). Examples include the works of Scopoli, Ventenat, Batsch and Grisebach.
John Ray system (1686–1704)
  • A discourse on the seeds of plants
  • Methodus plantarum nova
  • De Variis Plantarum Methodis Dissertatio Brevis
  • Methodus plantarum emendata et aucta
Linnaean system (1735–51)
Adanson system (1763)
Familles naturelles des plantes
De Jussieu system (1789)
Genera Plantarum, secundum ordines naturales disposita juxta methodum in Horto Regio Parisiensi exaratam
De Candolle system (1819–24)
Berchtold and Presl
system (1820–1823)
Agardh system (1825)
Classes Plantarum
Gray system (1821)
The Natural Arrangement of British Plants
Perleb system (1826)
Lehrbuch der Naturgeschichte des Pflanzenreichs
Dumortier system (1829)
Analyse des familles des plantes
Lindley system (1830–45)
  • An Introduction to the Natural System of Botany
  • The Vegetable Kingdom
Don system (1834)
General History of Dichlamydious Plants.
Bentham & Hooker system
(1862–83)
Genera plantarum ad exemplaria imprimis in herbariis kewensibus servata definita.
Baillon system (1867–94)
Histoire des plantes
Post-Darwinian (Phyletic)
Nineteenth century
Eichler system (1875–1886)
  • Blüthendiagramme: construirt und erläutert
  • Syllabus der Vorlesungen über Phanerogamenkunde
Engler system (1886–1924)
van Tieghem system (1891)
Traité de botanique
Twentieth century
Dalla Torre & Harms
system (1900–07)
Genera Siphonogamarum, ad systema Englerianum conscripta
Warming system (1912)
Haandbog i den systematiske botanik
Hallier system (1912)
L'origine et le système phylétique des angiospermes
Bessey system (1915)
The phylogenetic taxonomy of flowering plants
Wettstein system (1901–35)
Handbuch der systematischen Botanik
Lotsy system (1907–11)
Vorträge über botanische Stammesgeschichte, gehalten an der Reichsuniversität zu Leiden. Ein Lehrbuch der Pflanzensystematik.
Hutchinson system (1926–73)
The families of flowering plants, arranged according to a new system based on their probable phylogeny
Calestani system (1933)
Le origini e la classificazione delle Angiosperme
Kimura system (1956)
Système et phylogénie des monocotyledones
Emberger system (1960)
Traité de Botanique systématique
Melchior system (1964)
Syllabus der Pflanzenfamilien
Takhtajan system (1966–97)
  • A system and phylogeny of the flowering plants
  • Flowering plants: origin and dispersal
  • Diversity and classification of flowering plants
Cronquist system (1968–81)
  • The evolution and classification of flowering plants
  • An integrated system of classification of flowering plants
Goldberg system (1986–89
Classification, Evolution and Phylogeny of the Families of Dicotyledons
Dahlgren system (1975–85)
The families of the monocotyledons: structure, evolution, and taxonomy
Thorne system (1968–2000)
An updated phylogenetic classification of the flowering plants
Kubitzki system (1990–)
The Families and Genera of Vascular Plants
Reveal system (1997)
Reveal System of Angiosperm Classification
See also
Plantae at Wikispecies •