Misplaced Pages

APG III system

Article snapshot taken from Wikipedia with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.
(Redirected from Angiosperm Phylogeny Group III system) System of plant taxonomy See also: Angiosperm Phylogeny Group

The APG III system of flowering plant classification is the third version of a modern, mostly molecular-based, system of plant taxonomy being developed by the Angiosperm Phylogeny Group (APG). Published in 2009, it was superseded in 2016 by a further revision, the APG IV system.

Along with the publication outlining the new system, there were two accompanying publications in the same issue of the Botanical Journal of the Linnean Society:

  • The first, by Chase & Reveal, was a formal phylogenetic classification of all land plants (embryophytes), compatible with the APG III classification. As the APG have chosen to eschew ranks above order, this paper was meant to fit the system into the existing Linnaean hierarchy for those that prefer such a classification. The result was that all land plants were placed in the class Equisetopsida, which was then divided into 16 subclasses and a multitude of superorders.
  • The second, by Haston et al., was a linear sequence of families following the APG III system (LAPG III). This provided a numbered list to the 413 families of APG III. A linear sequence is of particular use to herbarium curators and those working on floristic works wishing to arrange their taxa according to APG III.

Organization

The APG III system recognized all of the 45 orders of the previous system, as well as 14 new ones. The order Ceratophyllales was erroneously marked as a new order, as it had been recognized in both of the previous APG systems. The newly recognized orders were:

Amborellales, Nymphaeales, Chloranthales, Petrosaviales, Trochodendrales, Buxales, Vitales, Zygophyllales, Picramniales, Huerteales, Berberidopsidales, Escalloniales, Bruniales, and Paracryphiales.

The designation of alternative "bracketed families" was abandoned in APG III, because its inclusion in the previous system had been unpopular. APG III recognized 413 families, 43 fewer than in the previous system. Forty-four of the 55 "bracketed families" were discontinued, and 20 other families were discontinued as well.

The discontinued bracketed families were:

Illiciaceae, Alliaceae, Agapanthaceae, Agavaceae, Aphyllanthaceae, Hesperocallidaceae, Hyacinthaceae, Laxmanniaceae, Ruscaceae, Themidaceae, Asphodelaceae, Hemerocallidaceae, Kingdoniaceae, Fumariaceae, Pteridophyllaceae, Didymelaceae, Tetracentraceae, Pterostemonaceae, Hypseocharitaceae, Francoaceae, Memecylaceae, Lepuropetalaceae, Rhoipteleaceae, Medusagynaceae, Quiinaceae, Malesherbiaceae, Turneraceae, Bretschneideraceae, Diegodendraceae, Cochlospermaceae, Peganaceae, Tetradiclidaceae, Nyssaceae, Ternstroemiaceae, Pellicieraceae, Aucubaceae, Donatiaceae, Lobeliaceae, Desfontainiaceae, Diervillaceae, Dipsacaceae, Linnaeaceae, Morinaceae, and Valerianaceae.

The other discontinued families were:

Limnocharitaceae, Luzuriagaceae, Sparganiaceae, Ixerbaceae, Ledocarpaceae, Heteropyxidaceae, Psiloxylaceae, Oliniaceae, Rhynchocalycaceae, Parnassiaceae, Maesaceae, Myrsinaceae, Theophrastaceae, Eremosynaceae, Polyosmaceae, Tribelaceae, Sphenostemonaceae, Aralidiaceae, Mackinlayaceae, and Melanophyllaceae.

21 families were accepted in the APG III system which had not been in the previous system, and a few families were moved to a different position. The newly recognized families are:

Cynomoriaceae, Haptanthaceae, Petermanniaceae, Schoepfiaceae, Limeaceae, Lophiocarpaceae, Montiaceae, Talinaceae, Anacampserotaceae, Centroplacaceae, Calophyllaceae, Guamatelaceae, Gerrardinaceae, Dipentodontaceae, Capparidaceae, Cleomaceae, Cytinaceae, Mitrastemonaceae, Metteniusaceae, Linderniaceae, and Thomandersiaceae.

The number of families not placed in any order was reduced from 39 to 10. Apodanthaceae and Cynomoriaceae were placed among the angiosperms, incertae sedis, that is, not in any group within the angiosperms. Eight other families were placed incertae sedis in various supra-ordinal groups within the angiosperms. The families not placed in any order were:

Apodanthaceae, Cynomoriaceae, Dasypogonaceae, Sabiaceae, Dilleniaceae, Icacinaceae, Metteniusaceae, Oncothecaceae, Vahliaceae, and Boraginaceae.

The paragraph below shows the number of families in each order and the placement of those families that were not included in any order. These figures were produced by simply counting the families in the text of the paper that established APG III.

ORDERS: Amborellales (1), Nymphaeales (3), Austrobaileyales (3), Chloranthales (1), Canellales (2), Piperales (5), Magnoliales (6), Laurales (7), Acorales (1), Alismatales (13), Petrosaviales (1), Dioscoreales (3), Pandanales (5), Liliales (10), Asparagales (14), Arecales (1), Poales (16), Commelinales (5), Zingiberales (8), Ceratophyllales (1), Ranunculales (7), Proteales (3), Trochodendrales (1), Buxales (2), Gunnerales (2), Saxifragales (14), Vitales (1), Zygophyllales (2), Celastrales (2), Oxalidales (7), Malpighiales (35), Fabales (4), Rosales (9), Fagales (7), Cucurbitales (7), Geraniales (3), Myrtales (9), Crossosomatales (7), Picramniales (1), Sapindales (9), Huerteales (3), Brassicales (17), Malvales (10), Berberidopsidales (2), Santalales (7), Caryophyllales (34), Cornales (6), Ericales (22), Garryales (2), Gentianales (5), Solanales (5), Lamiales (23), Aquifoliales (5), Asterales (11), Escalloniales (1), Bruniales (2), Apiales (7), Paracryphiales (1), Dipsacales (2).

SUPRA-ORDINAL GROUPS: commelinids (1), basal eudicots (1), Pentapetalae (1), lamiids incertae sedis (3), core lamiids (2), angiosperms incertae sedis (2).

The circumscription of the family Icacinaceae remains especially doubtful. Apodytes and its close relative, Rhaphiostylis, as well as Emmotum, Cassinopsis, and a few other genera were provisionally retained within it until further studies can determine whether they properly belong there.

Three genera (Gumillea, Nicobariodendron, and Petenaea) were placed within the angiosperms incertae sedis. Gumillea had been unplaced in APG II. Nicobariodendron and Petenaea were newly added to the list. The latter was later placed into its own family Petenaeaceae in the order Huerteales

The classification is shown below in two versions. The short version goes to the level of orders and of families unplaced in an order. The detailed version shows all the families. Orders at the same level in the classification are arranged alphabetically. Note that orders may not contain the same families as in earlier versions of the APG system (APG system, APG II system). Further detail on relationships can be seen in the phylogenetic tree below.

Short version

Detailed version

Legend:

* = new family placement;
† = newly recognized order for the APG system;
§ = new family circumscription described in the text;
$ = families that represent the broader circumscription of options available in APG II and favoured here;
$$ = families that were in square brackets in APG II, the narrower circumscriptions favoured here.

Angiosperms

Magnoliids

Monocots

Commelinids

Probable sister of eudicots

Eudicots

Core eudicots

Rosids

Fabids (eurosids I)

malvids (eurosids II)

Asterids

lamiids (euasterids I)

campanulids (euasterids II)

Taxa of uncertain position

Phylogeny

The APG III system was based on a phylogenetic tree for the angiosperms which included all of the 59 orders and 4 of the unplaced families. The systematic positions of the other 6 unplaced families was so uncertain that they could not be placed in any of the polytomies in the tree. They are shown in the classification table entitled "Detailed version" above, 4 in Euasterids I and 2 in Taxa of uncertain position.

The phylogenetic tree shown below was published with the APG III system, but without some of the labels that are added here.

angiosperms

Amborellales

Nymphaeales

Austrobaileyales

Chloranthales

magnoliids

Canellales

Piperales

Magnoliales

Laurales

monocots

Acorales

Alismatales

Petrosaviales

Dioscoreales

Pandanales

Liliales

Asparagales

commelinids

Dasypogonaceae

Arecales

Poales

Commelinales

Zingiberales

Ceratophyllales

eudicots

Ranunculales

Sabiaceae

Proteales

Trochodendrales

Buxales

core eudicots

Gunnerales

Dilleniaceae

Saxifragales

rosids

Vitales

eurosids
fabids

Zygophyllales

Celastrales

Oxalidales

Malpighiales

Fabales

Rosales

Fagales

Cucurbitales

malvids

Geraniales

Myrtales

Crossosomatales

Picramniales

Sapindales

Huerteales

Brassicales

Malvales

Berberidopsidales

Santalales

Caryophyllales

asterids

Cornales

Ericales

euasterids
lamiids

Garryales

Boraginaceae

Gentianales

Solanales

Lamiales

campanulids

Aquifoliales

Asterales

Escalloniales

Bruniales

Apiales

Paracryphiales

Dipsacales

Subfamilies replacing discontinued families

A number of subfamilies have been proposed to replace some of the families which were optional (i.e. bracketed) in APG II, but have been discontinued in APG III. These are shown in the table below.

Subfamilies replacing APG II bracketed families
APG II bracketed family APG III family: subfamily
Agapanthaceae Amaryllidaceae: Agapanthoideae
Agavaceae Asparagaceae: Agavoideae
Alliaceae Amaryllidaceae: Allioideae
Amaryllidaceae Amaryllidaceae: Amaryllidoideae
Aphyllanthaceae Asparagaceae: Aphyllanthoideae
Asparagaceae Asparagaceae: Asparagoideae
Asphodelaceae Xanthorrhoeaceae: Asphodeloideae
Hemerocallidaceae Xanthorrhoeaceae: Hemerocallidoideae
Hesperocallidaceae Asparagaceae: Agavoideae
Hyacinthaceae Asparagaceae: Scilloideae
Laxmanniaceae Asparagaceae: Lomandroideae
Ruscaceae Asparagaceae: Nolinoideae
Themidaceae Asparagaceae: Brodiaeoideae
Xanthorrhoeaceae Xanthorrhoeaceae: Xanthorrhoeoideae

References

  1. ^ Angiosperm Phylogeny Group (2009), "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III", Botanical Journal of the Linnean Society, 161 (2): 105–121, doi:10.1111/j.1095-8339.2009.00996.x, hdl:10654/18083
  2. As easy as APG III - Scientists revise the system of classifying flowering plants, The Linnean Society of London, 2009-10-08, retrieved 2009-10-29
  3. APG III tidies up plant family tree, Horticulture Week, 2009-10-08, retrieved 2009-10-29
  4. Chase, Mark W. & Reveal, James L. (2009), "A phylogenetic classification of the land plants to accompany APG III", Botanical Journal of the Linnean Society, 161 (2): 122–127, doi:10.1111/j.1095-8339.2009.01002.x
  5. Haston, E., Richardson, J.E., Stevens, P.F., Chase, M.W., Harris, D.J. (2009) The Linear Angiosperm Phylogeny Group (LAPG) III: a linear sequence of the families in APG III. Botanical Journal of the Linnean Society 161, 128–131.
  6. Christenhusz, M. J. M., M. F. Fay, J. J. Clarkson, P. Gasson, J. Morales Can, J. B. Jimenez Barrios & M. W. Chase (2010). Petenaeaceae, a new angiosperm family in Huerteales with a distant relationship to Gerrardina (Gerrardinaceae), Botanical Journal of the Linnean Society 164: 16-25. http://onlinelibrary.wiley.com/doi/10.1111/j.1095-8339.2010.01074.x/abstract
  7. Christenhusz, M. J. M., M. W. Chase, & M.F.Fay (2011). Preface to "Linear sequence, classification, synonymy, and bibliography of vascular plants: Lycophytes, ferns, gymnosperms and angiosperms", Phytotaxa 19: 4–6. http://www.mapress.com/phytotaxa/content/2011/f/pt00019p006.pdf
  8. Chase, M.W.; Reveal, J.L. & Fay, M.F. (2009), "A subfamilial classification for the expanded asparagalean families Amaryllidaceae, Asparagaceae and Xanthorrhoeaceae", Botanical Journal of the Linnean Society, 161 (2): 132–136, doi:10.1111/j.1095-8339.2009.00999.x

External links

List of systems of plant taxonomy
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.
Pre-Linnaean
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
Pre-Darwinian
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)		O Prirozenosti Rostlin
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 (1986–89Classification, 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
Angiosperm Phylogeny Group System (1998–)
See also
Plantae at Wikispecies •
Categories: