APG IV system

The APG IV system of flowering plant classification is the fourth version of a modern, mostly molecular-based, system of plant taxonomy for flowering plants (angiosperms) being developed by the Angiosperm Phylogeny Group (APG). It was published in 2016, seven years after its predecessor the APG III system was published in 2009, and 18 years after the first APG system was published in 1998.[1] In 2009, a linear arrangement of the system was published separately;[2] the APG IV paper includes such an arrangement, cross-referenced to the 2009 one.[1]

Compared to the APG III system, the APG IV system recognizes five new orders (Boraginales, Dilleniales, Icacinales, Metteniusales and Vahliales), along with some new families, making a total of 64 angiosperm orders and 416 families.[1] In general, the authors describe their philosophy as "conservative", based on making changes from APG III only where "a well-supported need" has been demonstrated. This has sometimes resulted in placements that are not compatible with published studies, but where further research is needed before the classification can be changed.[3]

Short version


Detailed version

Key to symbols used:

* = the family has been added or its circumscription changed since the APG III system of 2009
† = the order has been added since the APG III system

Basal angiosperms

Magnoliids

Independent lineage: unplaced to more inclusive clade

Monocots

Probable sister of eudicots

Eudicots

Core eudicots

Superrosids

Rosids

COM clade; placement uncertain

Rosids continued

Superasterids

Asterids

Phylogeny

Like the earlier APG systems, the APG IV revision is based on a phylogenetic tree for the angiosperms, as shown below.[4]

angiosperms
 

Amborellales

 
 
 

Nymphaeales

 
 
 

Austrobaileyales

 
Core angiosperms
 

Chloranthales

 
magnoliids
 
 

Magnoliales

 
 

Laurales

 
 
 
 

Piperales

 
 

Canellales

 
 
 
 
monocots
 

Acorales

 
 
 

Alismatales

 
 
 

Petrosaviales

 
 
 
 

Pandanales

 
 

Dioscoreales

 
 
 
 

Liliales

 
 
 

Asparagales

 
commelinids
 

Arecales

 
 
 

Poales

 
 
 

Commelinales

 
 

Zingiberales

 
 
 
 
 
 
 
 
 
 
 
 

Ceratophyllales

 
eudicots
 

Ranunculales

 
 
 

Proteales

 
 
 

Trochodendrales

 
 
 

Buxales

 
core eudicots

(continued)

 
 
 
 
 
 
 
 
 
 
 

core eudicots
 

Gunnerales

 
Pentapetalae
 

Dilleniales

 
superrosids
 

Saxifragales

 
rosids
 

Vitales

 
 
fabids
 

Zygophyllales

 
 
 
 

Fabales

 
 
 

Rosales

 
 
 

Fagales

 
 

Cucurbitales

 
 
 
 
 
 

Celastrales

 
 
 

Malpighiales

 
 

Oxalidales

 
 
 
 
 
malvids
 
 

Geraniales

 
 

Myrtales

 
 
 
 

Crossosomatales

 
 
 

Picramniales

 
 
 

Sapindales

 
 
 

Huerteales

 
 
 

Brassicales

 
 

Malvales

 
 
 
 
 
 
 
 
 
 
superasterids
 

Berberidopsidales

 
 
 

Santalales

 
 
 

Caryophyllales

 
asterids
 

Cornales

 
 
 

Ericales

 
 
campanulids
 

Aquifoliales

 
 
 

Asterales

 
 

Escalloniales

 
 
 

Bruniales

 
 
 

Apiales

 
 
 

Dipsacales

 
 

Paracryphiales

 
 
 
 
 
 
lamiids
 

Icacinales

 
 
 

Metteniusales

 
 
 

Garryales

 
 
 

Boraginales

 
 

Gentianales

 
 

Vahliales

 
 

Lamiales

 
 

Solanales

 
 
 
 
 
 
 
 
 
 
 
 
 

References

Bibliography

  • 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
  • Angiosperm Phylogeny Group (2016), "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG IV", Botanical Journal of the Linnean Society, 181 (1): 1–20, doi:10.1111/boj.12385
  • 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" (PDF), Botanical Journal of the Linnean Society, 161 (2): 128–131, doi:10.1111/j.1095-8339.2009.01000.x
  • Fay, Michael (9 May 2016), "APG - classification by consensus", Kew Science, RBG Kew, archived from the original on 2016-08-05, retrieved 2016-06-12
  • Cole, Theodor C.H.; Hilger, Hartmut H. & Stevens, Peter F. (2017), Angiosperm Phylogeny Poster - Flowering Plant Systematics (PDF), retrieved 2017-07-13
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