APG III system

Source: Wikipedia, the free encyclopedia.
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 Published in 2009, it was superseded in 2016 by a further revision, the APG IV system.[1][2][3]

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:

Organization

The APG III system recognized all of the 45

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:

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:

Morinaceae, and Valerianaceae
.

The other discontinued families were:

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:

Thomandersiaceae
.

The number of families not placed in any order was reduced from 39 to 10.

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:

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.[1]

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

genera were provisionally retained within it until further studies
can determine whether they properly belong there.

Three genera (

Petenaeaceae in the order Huerteales[6][7]

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

  • †
    Vitales
    Juss. ex Bercht. & J.Presl

eurosids I
)

eurosids II
)

Asterids

euasterids I
)

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,[1] but without some of the labels that are added here.

angiosperms
 

Amborellales

Nymphaeales

Austrobaileyales

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.[8] 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. ^
    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. 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. doi:10.1111/j.1095-8339.2009.00999.x

External links
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