APG

Proper noun

 * 1)  Any classification (of the Angiosperms) conforming to the publications of the Angiosperm Phylogeny Group.
 * 2)  The Angiosperm Phylogeny Group: an international group of botanists.
 * 3)  The classification (of the Angiosperms) in the first, 1998, publication by the Angiosperm Phylogeny Group, as distinct from APG II (2003).