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In the APG system, genus Carya ( and the whole Juglandaceae family ) has been recently moved to the Fagales order.
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APG and system
Asparagales is the name of an order of plants, used in modern classification systems such as the APG III system ( which is used throughout this article ).
The families of the Asparagales, as set out in the APG III system, are briefly surveyed below.
The Angiosperm Phylogeny Group system ( APG ) of 1998 and APG II ( 2003 ) assigned the Alismatales to the monocots, which may be thought of as an unranked clade containing the families listed below.
The APG III system ( 2009 ) differs only in that the Limnocharitaceae are combined with the Alismataceae ; it was also suggested that the genus Maundia ( of the Juncaginaceae ) could be separated into a monogeneric family, Maundiaceae, but the authors noted that more study was necessary before Maundiaceae could be recognized.
The families given at right are those recognized in the APG III system.
The order Apiales is placed within the asterid group of eudicots as circumscribed by the APG III system.
The name and order Asterales is botanically venerable, dating back to at least 1926 in the Hutchinson system of plant taxonomy when it contained only five families, of which only two are retained in the APG III classification.
Under the Cronquist system of taxonomic classification of flowering plants Asteraceae was the only family in the group, but newer systems ( such as APG II and APG III ) have expanded it to eleven.
The family is solidly placed within the Apiales order in the APG III classification system.
The APG III system ( 2009 ) places the genus in the family Xanthorrhoeaceae, subfamily Asphodeloideae .< ref >
The order is not recognized in the APG II system, of 2003, which places the plants involved in the order Poales.
The Brassicales are an order of flowering plants, belonging to the eurosids II group of dicotyledons under the APG II system.
The family is included in Brassicales according to the APG system.
The APG II system, therefore, has merged the two families under the name ' Brassicaceae '.
The APG III system has recently adopted this last solution, but this may change as a consensus arises on this point.
This is unchanged from the APG II of 2003, but different from the older APG system of 1998, which did not include Hanguanaceae.
The APG II system, used here, assigns the plants involved to the order Poales.
In APG II system, of 2003, this order was placed in the clade monocots and comprised the families Burmanniaceae, Dioscoreaceae and Nartheciaceae.
Under the APG system of 1998, the order was placed in the clade monocots and comprised the families Burmanniaceae, Dioscoreaceae, Taccaceae, Thismiaceae and Trichopodaceae
Under the more recent Angiosperm Phylogeny Group ( APG II ) system, the circumscription of the order is much the same but the families are circumscribed differently.
The APG II system assigns these plants to the order Poales.
Those marked with an asterisk are recognized in the APG III system.
APG and genus
The APG II system elevates the first of these three families to become an order Acorales of its own ( consisting of one genus only!
In the APG III system, the genus is placed in the family Asparagaceae, subfamily Nolinoideae ( formerly the family Ruscaceae ).
Dipteronia is a genus of two living and one extinct species, regarded in the soapberry family Sapindaceae sensu lato after Angiosperm Phylogeny Group ( APG I 1998, APG II 2003 ) and more recently ( Harrington et al.
More recently, the APG III system of 2009 included a second genus, Sparganium, in this family.
Of these, many, including the type genus Flacourtia, have now been transferred to the Salicaceae in the molecular phylogeny-based classification, known as the APG II system, established by the Angiosperm Phylogeny Group.
The APG II system, of 2003, has accepted this genus as constituting its own family Xeronemataceae.
The second edition of the Jepson Manual places the genus in Agavaceae ( equivalent to the APG III subfamily Agavoideae ).
In the APG III system several genera were moved to the Montiaceae, Didiereaceae, Anacampserotaceae and Talinaceae, thus making the family monotypic and only containing the genus Portulaca.
They are treated within the Sterculiaceae by the most of the authors, in the tribe Fremontodendreae together with the genus Chiranthodendron, but also included in the family Malvaceae ( fide APG ).
The APG II system of 2003 recognises the family, but in a new circumscription in that it includes the genus Didymeles ( two species of evergreen trees from Madagascar ).
However, APG II does allow the option of segregating this genus as family Didymelaceae, as an optional segregate.
The goosefoot subfamily ( Chenopodioideae ) of the Amaranthaceae, in which the genus Atriplex is placed in the APG II system, was formerly considered a distinct family ( Chenopodiaceae ).
The APG III system recognized this genus as a part of the family Centroplacaceae.
This genus was traditionally treated as belonging to the family Liliaceae, but the APG II system of 2003 placed it in the family Nartheciaceae.
This genus was previously recognized in its own family, Rhoipteleaceae, but the APG III system of 2009 placed it in the Juglandaceae family.
By the APG III system of 2009, Sparganium had been found to be fairly closely related to Typha, and so was placed with that genus in family Typhaceae.
APG and Juglandaceae
In the APG II system these two families are united into family Juglandaceae ( with the split into two families being optional ), and the family is placed in the order Fagales.
APG and family
Based on phylogenetic research, the latest ( 2009 ) revision of the APG classification supports the use of a single broadly defined family, Asparagaceae sensu lato.
Successive revisions of the influential Angiosperm Phylogeny Group ( APG ) classification have changed the circumscription of the family.
In APG II, the family Thismiaceae has been included in family Burmanniaceae and the families Taccaceae and Trichopodaceae have been included in family Dioscoreaceae.
In APG III, the family Luzuriagaceae is combined with the family Alstroemeriaceae and the family Petermanniaceae is recognized.
The APG system ( 1998 ) also placed the order in the clade monocots, but with a slightly different circumscription ( missing the family Corsiaceae ):
The dominant family in the APG II-system is the extended Malvaceae ( Malvaceae sensu lato ) with over 4000 species, followed by Thymelaeaceae with 750 species.
The difference from the APG II system is not as large as may appear, as the plants in the families Aceraceae and Hippocastanaceae stay in this order at APG II ( both included in family Sapindaceae ).
The species now composing the family Nitrariaceae in APG II also belonged to this order in the Cronquist system as part of the family Zygophyllaceae, while those now in the family Kirkiaceae were present as part of the family Simaroubaceae.
The APG II system placed the family in Malpighiales, based on a DNA sequence for the rbcL gene from Whittonia.
The AP-Website indicates that Olacaceae ( sensu APG II ) is not a good family and should be split.
Studies based on DNA sequences also indicate that the family Schoepfiaceae should be resurrected ( as has been done in the updated APG III-publication ) to accommodate Schoepfia ( formerly in Olacaceae ), Arjona and Quinchamalium ( both previously in Santalaceae ).
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