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 Published in 2009, it was superseded in 2016 by a further revision, the APG IV system.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 Equisitopsida, which was then divided into 16 subclasses (including the Magnoliidae, containing all flowering plants) 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.
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, but 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.
clade angiospermsclade magnoliidsclade monocotsclade commelinidsprobable sister of eudicotsclade eudicotsclade core eudicotsclade rosidsclade fabids (eurosids I)clade malvids (eurosids II)(back to core eudicots)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;
$$ = families that were in square brackets in APG II, the narrower circumscriptions favoured here.
†Amborellales Melikyan, A.V.Bobrov & ZaytzevaAmborellaceae Pichon†Nymphaeales Salisb. ex Bercht. & J.Presl$$Cabombaceae Rich. ex A.Rich.*Hydatellaceae U.Hamann$$Nymphaeaceae Salisb.Austrobaileyales Takht. ex RevealAustrobaileyaceae Croizat$Schisandraceae Blume (including Illiciaceae A.C.Sm.)Trimeniaceae L.S.Gibbs†Chloranthales R.Br.Chloranthaceae R.Br. ex SimsCanellales CronquistCanellaceae Mart.Winteraceae R.Br. ex Lindl.Piperales Bercht. & J.PreslAristolochiaceae Juss.Hydnoraceae C.AgardhLactoridaceae Engl.Piperaceae GisekeSaururaceae F.VoigtLaurales Juss. ex Bercht. & J.PreslAtherospermataceae R.Br.Calycanthaceae Lindl.Gomortegaceae ReicheHernandiaceae BlumeLauraceae Juss.Monimiaceae Juss.Siparunaceae SchoddeMagnoliales Juss. ex Bercht. & J.PreslAnnonaceae Juss.Degeneriaceae I.W.Bailey & A.C.Sm.Eupomatiaceae Orb.Himantandraceae DielsMagnoliaceae Juss.Myristicaceae R.Br.Acorales LinkAcoraceae MartinovAlismatales R.Br. ex Bercht. & J.Presl§Alismataceae Vent. (including Limnocharitaceae Takht. ex Cronquist)Aponogetonaceae Planch.Araceae Juss.Butomaceae Mirb.Cymodoceaceae VinesHydrocharitaceae Juss.Juncaginaceae Rich.Posidoniaceae VinesPotamogetonaceae Bercht. & J.PreslRuppiaceae Horan.Scheuchzeriaceae F.RudolphiTofieldiaceae Takht.Zosteraceae Dumort.†Petrosaviales Takht.Petrosaviaceae Hutch.Dioscoreales R.Br.Burmanniaceae BlumeDioscoreaceae R.Br.Nartheciaceae Fr. ex BjurzonPandanales R.Br. ex Bercht. & J.PreslCyclanthaceae Poit. ex A.Rich.Pandanaceae R.Br.Stemonaceae CaruelTriuridaceae GardnerVelloziaceae J.AgardhLiliales Perleb§Alstroemeriaceae Dumort. (including Luzuriagaceae Lotsy)Campynemataceae Dumort.Colchicaceae DC.Corsiaceae Becc.Liliaceae Juss.Melanthiaceae Batsch ex Borkh.*Petermanniaceae Hutch.Philesiaceae Dumort.Ripogonaceae Conran & CliffordSmilacaceae Vent.Asparagales Link$Amaryllidaceae J.St.-Hil. (including Agapanthaceae F.Voigt, Alliaceae Borkh.)$Asparagaceae Juss. (including Agavaceae Dumort., Aphyllanthaceae Burnett, Hesperocallidaceae Traub, Hyacinthaceae Batsch ex Borkh., Laxmanniaceae Bubani, Ruscaceae M.Roem., Themidaceae Salisb.)Asteliaceae Dumort.Blandfordiaceae R.Dahlgren & CliffordBoryaceae M.W.Chase, Rudall & ConranDoryanthaceae R.Dahlgren & CliffordHypoxidaceae R.Br.Iridaceae Juss.Ixioliriaceae NakaiLanariaceae R.Dahlgren & A.E.van WykOrchidaceae Juss.Tecophilaeaceae Leyb.$Xanthorrhoeaceae Dumort. (including Asphodelaceae Juss. and Hemerocallidaceae R.Br.)Xeronemataceae M.W.Chase, Rudall & M.F.FayDasypogonaceae Dumort.Arecales BromheadArecaceae Bercht. & J.PreslCommelinales Mirb. ex Bercht. & J.PreslCommelinaceae Mirb.Haemodoraceae R.Br.Hanguanaceae Airy ShawPhilydraceae LinkPontederiaceae KunthPoales SmallAnarthriaceae D.F.Cutler & Airy ShawBromeliaceae Juss.Centrolepidaceae Endl.Cyperaceae Juss.Ecdeiocoleaceae D.F.Cutler & Airy ShawEriocaulaceae MartinovFlagellariaceae Dumort.Joinvilleaceae Toml. & A.C.Sm.Juncaceae Juss.Mayacaceae KunthPoaceae BarnhartRapateaceae Dumort.Restionaceae R.Br.Thurniaceae Engl.§Typhaceae Juss. (including Sparganiaceae Hanin)Xyridaceae C.AgardhZingiberales Griseb.Cannaceae Juss.Costaceae NakaiHeliconiaceae VinesLowiaceae Ridl.Marantaceae R.Br.Musaceae Juss.Strelitziaceae Hutch.Zingiberaceae MartinovCeratophyllales LinkCeratophyllaceae GrayRanunculales Juss. ex Bercht. & J.PreslBerberidaceae Juss.$Circaeasteraceae Hutch. (including Kingdoniaceae Airy Shaw)Eupteleaceae K.Wilh.Lardizabalaceae R.Br.Menispermaceae Juss.$Papaveraceae Juss. (including Fumariaceae Marquis, Pteridophyllaceae Nakai ex Reveal & Hoogland)Ranunculaceae Juss.Sabiaceae BlumeProteales Juss. ex Bercht. & J.PreslNelumbonaceae A.Rich.$$Platanaceae T.Lestib.$$Proteaceae Juss.†Trochodendrales Takht. ex Cronquist$Trochodendraceae Eichler (including Tetracentraceae A.C.Sm.)†Buxales Takht. ex Reveal$Buxaceae Dumort. (including Didymelaceae Leandri)*Haptanthaceae C.NelsonGunnerales Takht. ex Reveal$$Gunneraceae Meisn.$$Myrothamnaceae Nied.Dilleniaceae Salisb.Saxifragales Bercht. & J.PreslAltingiaceae Horan.Aphanopetalaceae DoweldCercidiphyllaceae Engl.Crassulaceae J.St.-Hil.Daphniphyllaceae Müll.-Arg.Grossulariaceae DC.$$Haloragaceae R.Br.Hamamelidaceae R.Br.$Iteaceae J.Agardh (including Pterostemonaceae Small)Paeoniaceae Raf.$$Penthoraceae Rydb. ex Britt.*§Peridiscaceae Kuhlm. (including Medusandraceae Brenan, Soyauxia Oliver)Saxifragaceae Juss.$$Tetracarpaeaceae Nakai†Berberidopsidales DoweldAextoxicaceae Engl. & GilgBerberidopsidaceae Takht.Santalales R.Br. ex Bercht. & J.Presl*Balanophoraceae Rich.Loranthaceae Juss.Misodendraceae J.AgardhSantalaceae R.Br.Olacaceae R.Br.Opiliaceae Valeton*Schoepfiaceae BlumeCaryophyllales Juss. ex Bercht. & J.PreslAchatocarpaceae HeimerlAizoaceae MartinovAmaranthaceae Juss.*Anacampserotaceae Eggli & NyffelerAncistrocladaceae Planch. ex Walp.Asteropeiaceae Takht. ex Reveal & HooglandBarbeuiaceae NakaiBasellaceae Raf.Cactaceae Juss.Caryophyllaceae Juss.§Didiereaceae Radlk.Dioncophyllaceae Airy ShawDroseraceae Salisb.Drosophyllaceae Chrtek, Slavíková & StudnickaFrankeniaceae Desv.Gisekiaceae NakaiHalophytaceae A.Soriano*Limeaceae Shipunov ex Reveal*Lophiocarpaceae Doweld & Reveal§Molluginaceae Bartl.*Montiaceae Raf.Nepenthaceae Dumort.Nyctaginaceae Juss.Physenaceae Takht.Phytolaccaceae R.Br.Plumbaginaceae Juss.Polygonaceae Juss.§Portulacaceae Juss.Rhabdodendraceae PranceSarcobataceae BehnkeSimmondsiaceae Tiegh.Stegnospermataceae Nakai*Talinaceae DoweldTamaricaceae Link†Vitales Juss. ex Bercht. & J.PreslVitaceae Juss.†Zygophyllales Link$$Krameriaceae Dumort.$$Zygophyllaceae R.Br.Celastrales Link$Celastraceae R.Br. (including Lepuropetalaceae Nakai, Parnassiaceae Martinov, Pottingeriaceae Takht.)Lepidobotryaceae J.LéonardOxalidales Bercht. & J.PreslBrunelliaceae Engl.Cephalotaceae Dumort.Connaraceae R.Br.Cunoniaceae R.Br.Elaeocarpaceae Juss. ex DC.*Huaceae A.Chev.Oxalidaceae R.Br.Malpighiales Juss. ex Bercht. & J.PreslAchariaceae HarmsBalanopaceae Benth. & Hook.f.Bonnetiaceae L.Beauvis. ex Nakai*Calophyllaceae J.AgardhCaryocaraceae Voigt*Centroplacaceae Doweld & Reveal$$Chrysobalanaceae R.Br.§Clusiaceae Lindl.Ctenolophonaceae Exell & Mendonça$$Dichapetalaceae Baill.Elatinaceae Dumort.$$§Erythroxylaceae Kunth (including Aneulophus Benth.)Euphorbiaceae Juss.$$Euphroniaceae Marc.-BertiGoupiaceae MiersHumiriaceae A.Juss.Hypericaceae Juss.Irvingiaceae Exell & MendonçaIxonanthaceae Planch. ex Miq.Lacistemataceae Mart.Linaceae DC. ex PerlebLophopyxidaceae H.Pfeiff.Malpighiaceae Juss.$Ochnaceae DC. (including Medusagynaceae Engl. & Gilg, Quiinaceae Choisy)Pandaceae Engl. & Gilg$Passifloraceae Juss. ex Roussel (including Malesherbiaceae D.Don, Turneraceae Kunth ex DC.)Phyllanthaceae MartinovPicrodendraceae SmallPodostemaceae Rich. ex KunthPutranjivaceae Meisn.*Rafflesiaceae Dumort.$$Rhizophoraceae Pers.Salicaceae Mirb.$$Trigoniaceae A.Juss.Violaceae BatschCucurbitales Juss. ex Bercht. & J.PreslAnisophylleaceae Ridl.Begoniaceae C.AgardhCoriariaceae DC.Corynocarpaceae Engl.Cucurbitaceae Juss.Datiscaceae Dumort.Tetramelaceae Airy ShawFabales BromheadFabaceae Lindl.Polygalaceae Hoffmanns. & LinkQuillajaceae D.DonSurianaceae Arn.Fagales Engl.Betulaceae GrayCasuarinaceae R.Br.Fagaceae Dumort.§Juglandaceae DC. ex Perleb (including Rhoipteleaceae Hand.-Mazz.)Myricaceae A.Rich. ex KunthNothofagaceae KuprianTicodendraceae Gómez-Laur. & L.D.GómezRosales Bercht. & J.PreslBarbeyaceae RendleCannabaceae MartinovDirachmaceae Hutch.Elaeagnaceae Juss.Moraceae Gaudich.Rhamnaceae Juss.Rosaceae Juss.Ulmaceae Mirb.Urticaceae Juss.Geraniales Juss. ex Bercht. & J.Presl$Geraniaceae Juss. (including Hypseocharitaceae Wedd.)$Melianthaceae Horan. (including Francoaceae A.Juss.)§Vivianiaceae Klotzsch (including Ledocarpaceae Meyen)Myrtales Juss. ex Bercht. & J.PreslAlzateaceae S.A.GrahamCombretaceae R.Br.Crypteroniaceae A.DC.Lythraceae J.St.-Hil.$Melastomataceae Juss. (including Memecylaceae DC.)§Myrtaceae Juss. (including Heteropyxidaceae Engl. & Gilg, Psiloxylaceae Croizat)Onagraceae Juss.§Penaeaceae Sweet ex Guill. (including Oliniaceae Arn., Rhynchocalycaceae L.A.S.Johnson & B.G.Briggs)Vochysiaceae A.St.-Hil.Crossosomatales Takht. ex Reveal*Aphloiaceae Takht.Crossosomataceae Engl.*Geissolomataceae A.DC.*Guamatelaceae S.Oh & D.PotterStachyuraceae J.AgardhStaphyleaceae Martinov*§Strasburgeriaceae Soler. (including Ixerbaceae Griseb. ex Doweld & Reveal)†Picramniales Doweld*Picramniaceae Fernando & Quinn†Huerteales Doweld*Dipentodontaceae Merr.*Gerrardinaceae AlfordTapisciaceae Takht.Brassicales Bromhead$Akaniaceae Stapf (including Bretschneideraceae Engl. & Gilg)Bataceae Mart. ex Perleb§Brassicaceae Burnett*Capparaceae Juss.Caricaceae Dumort.*Cleomaceae Bercht. & J.PreslEmblingiaceae J.AgardhGyrostemonaceae A.Juss.Koeberliniaceae Engl.Limnanthaceae R.Br.Moringaceae MartinovPentadiplandraceae Hutch. & DalzielResedaceae MartinovSalvadoraceae Lindl.Setchellanthaceae IltisTovariaceae PaxTropaeolaceae Juss. ex DC.Malvales Juss. ex Bercht. & J.Presl$Bixaceae Kunth (including Cochlospermaceae Planch., Diegodendraceae Capuron)Cistaceae Juss.*Cytinaceae A.Rich.Dipterocarpaceae BlumeMalvaceae Juss.Muntingiaceae C.Bayer, M.W.Chase & M.F.FayNeuradaceae Kostel.Sarcolaenaceae CaruelSphaerosepalaceae Tiegh. ex BullockThymelaeaceae Juss.Sapindales Juss. ex Bercht. & J.PreslAnacardiaceae R.Br.Biebersteiniaceae Schnizl.Burseraceae KunthKirkiaceae Takht.Meliaceae Juss.$Nitrariaceae Lindl. (including Peganaceae Tiegh. ex Takht., Tetradiclidaceae Takht.)Rutaceae Juss.Sapindaceae Juss.Simaroubaceae DC.Cornales Link.Cornaceae Bercht. & J.Presl (including Nyssaceae Juss. ex Dumort.)Curtisiaceae Takht.Grubbiaceae Endl. ex Meisn.Hydrangeaceae Dumort.Hydrostachyaceae Engl.Loasaceae Juss.Ericales Bercht. & J.PreslActinidiaceae Engl. & Gilg.Balsaminaceae A.Rich.Clethraceae KlotzschCyrillaceae Lindl.Diapensiaceae Lindl.Ebenaceae GürkeEricaceae Juss.Fouquieriaceae DC.Lecythidaceae A.Rich.Marcgraviaceae Bercht. & J.Presl*Mitrastemonaceae Makino$Pentaphylacaceae Engl. (including Ternstroemiaceae Mirb. ex DC.)Polemoniaceae Juss.§Primulaceae Batsch ex Borkh. (including Maesaceae Anderb., B.Ståhl & Källersjö, Myrsinaceae R.Br., Theophrastaceae G.Don)Roridulaceae MartinovSapotaceae Juss.Sarraceniaceae Dumort.$$Sladeniaceae Airy ShawStyracaceae DC. & Spreng.Symplocaceae Desf.$Tetrameristaceae Hutch. (including Pellicieraceae L.Beauvis.)Theaceae Mirb. ex Ker Gawl.§*Boraginaceae Juss. (including Hoplestigmataceae Gilg)Vahliaceae DandyIcacinaceae MiersMetteniusaceae H.Karst. ex Schnizl.Oncothecaceae Kobuski ex Airy ShawGarryales Lindl.Eucommiaceae Engl.$Garryaceae Lindl. (including Aucubaceae Bercht. & J.Presl)Gentianales Juss. ex Bercht. & J.PreslApocynaceae Juss.Gelsemiaceae Struwe & V.A.AlbertGentianaceae Juss.Loganiaceae R.Br. ex Mart.Rubiaceae Juss.Lamiales Bromhead§Acanthaceae Juss.Bignoniaceae Juss.Byblidaceae DominCalceolariaceae OlmsteadCarlemanniaceae Airy ShawGesneriaceae Rich. & Juss.Lamiaceae Martinov*Linderniaceae Borsch, K.Müll., & Eb.Fisch.Lentibulariaceae Rich.Martyniaceae Horan.Oleaceae Hoffmanns. & LinkOrobanchaceae Vent.Paulowniaceae NakaiPedaliaceae R.Br.Phrymaceae Schauer§Plantaginaceae Juss.Plocospermataceae Hutch.Schlegeliaceae RevealScrophulariaceae Juss.Stilbaceae KunthTetrachondraceae Wettst.*Thomandersiaceae Sreem.Verbenaceae J.St.-Hil.Solanales Juss. ex Bercht. & J.PreslConvolvulaceae Juss.Hydroleaceae R.Br. ex EdwardsMontiniaceae NakaiSolanaceae Juss.Sphenocleaceae T.Baskerv.Aquifoliales SenftAquifoliaceae Bercht. & J.Presl§Cardiopteridaceae Blume (including Leptaulaceae Tiegh.)Helwingiaceae Decne.Phyllonomaceae SmallStemonuraceae KårehedAsterales LinkAlseuosmiaceae Airy ShawArgophyllaceae Takht.Asteraceae Bercht. & J.PreslCalyceraceae R.Br. ex Rich.$Campanulaceae Juss. (including Lobeliaceae Juss.)Goodeniaceae R.Br.Menyanthaceae Dumort.Pentaphragmataceae J.AgardhPhellinaceae Takht.Rousseaceae DC.$Stylidiaceae R.Br. (including Donatiaceae B.Chandler)†Escalloniales R.Br.§Escalloniaceae R.Br. ex Dumort. (including Eremosynaceae Dandy, Polyosmaceae Blume, Tribelaceae Airy Shaw)†Bruniales Dumort.Bruniaceae R.Br. ex DC.§Columelliaceae D.Don (including Desfontainiaceae Endl.)†Paracryphiales Takht. ex Reveal§Paracryphiaceae Airy Shaw (including *Quintiniaceae Doweld, Sphenostemonaceae P.Royen & Airy Shaw)Dipsacales Juss. ex Bercht. & J.PreslAdoxaceae E.Mey.§Caprifoliaceae Juss. (including Diervillaceae Pyck, Dipsacaceae Juss., Linnaeaceae Backlund, Morinaceae Raf., Valerianaceae Batsch)Apiales NakaiApiaceae Lindl. (including Mackinlayaceae)Araliaceae Juss.Griseliniaceae J.R.Forst. & G.Forst. ex A.Cunn.Myodocarpaceae DoweldPennantiaceae J.AgardhPittosporaceae R.Br.§Torricelliaceae Hu (including Aralidiaceae Philipson & B.C.Stone, Melanophyllaceae Takht. ex Airy Shaw)Apodanthaceae Takht. (three genera, now in Cucurbitales)Cynomoriaceae Endl. ex Lindl.Gumillea Ruiz & Pav.Petenaea Lundell (now in Huerteales)Nicobariodendron (see Simmons, 2004; probably in Celastraceae).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.
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.