Author:
Jan Scholten
Book:
Qjurement
Type:
Theory
Chapter:
Apg2 classification
The second version of the Apg classification, Apg2, was published in 2003. Many families and orders of uncertain place in Apg1 received a place in the Apg2 classification.
The highers clades, such as monocots, eudicots, rosids, asterids are treted teh same as in Apg1, without a qualificatiuons of the level of the clades
The Apg2 system recognized 45 orders, five more than the Apg1 system. The new orders were Austrobaileyales, Canellales, Gunnerales, Celastrales, and Crossosomatales, all of which were families unplaced as to order, although contained in supra-ordinal clades, in the Apg1 system. Apg2 recognized 457 families, five fewer than the Apg1 system. 39 families were not placed in any order, but 36 of the 39 were placed in a supra-ordinal clade within the angiosperms. 55 families came to be known as "bracketed families". They were optional segregates of families that could be circumscribed in a larger sense.
The Apg2 system was influential and was adopted in whole or in part, sometimes with modifications, in a number of references.
Angiosperms
Magnoliids: Laurales, Magnoliales, Piperales, Canellales.
Magnoliids basal: Austrobaileyales, Ceratophyllales.
Magnoliids basal: Amborellaceae, Chloranthaceae, Nymphaeaceae.
Monocots: Acorales, Alismatales, Asparagales, Dioscoreales, Liliales, Pandanales
Monocot basal: Petrosaviaceae
Commelinoids: Arecales, Commelinales, Poales, Zingiberales
Eudicots
Eudicots: Ranunculales, Proteales
Eudicots basal: Buxaceae, Didymelaceae, Sabiaceae, Trochodendraceae
Core eudicots: Caryophyllales, Saxifragales, Santalales, Gunnerales
Core eudicots basal: Aextoxicaceae, Berberidopsidaceae, Dilleniaceae, Myrothamnaceae, Vitaceae
Rosids
Rosids basal: Aphloiaceae, Geissolomataceae, Strasburgeriaceae, Vitaceae, Ixerbaceae, Picramniaceae.
Rosids basal: Myrtales, Crossosomatales, Geraniales
Eurosids I basal: Zygophyllaceae, Huaceae.
Eurosids I: Celastrales, Oxalidales, Malpighiales, Fagales, Fabales, Roslaes, Cucurbitales
Eurosids II basal: Tapisciaceae
Eurosids II: Malvales, Sapindales, Brassicales
Asterids
Asterids basal: Cornales, Ericales
Euasterids I: Garryales, Gentianales, Lamiales, Solanales.
Euasterids I basal: Boraginaceae, Icacinaceae, Oncothecaceae, Vahliaceae
Euasterids II: Aquifoliales, Campanulales, DIpsacales, Apiales.
Euasterids II basal: Bruniaceae, Carlemanniaceae, Columelliaceae, Eremosynaceae, Escalloniaceae, Bruniaceae, Paracryphiaceae, Polyosmaceae, Sphenostemonaceae, Tribelaceae.
Angiosperm Phylogeny Group (2003). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG II". Botanical Journal of the Linnean Society 141(4): 399-436.
Angiosperm Phylogeny Group; An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG II; Botanical Journal of the Linnean Society 141(4), 399-436; 2003.