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.