Mesangiospermae

Mesangiospermae is a group of flowering plants, informally called "mesangiosperms". They are one of four clades of angiosperms. It was a name first described for the PhyloCode system of phylogenetic nomenclature. There are about 350,000 species of mesangiosperms. The mesangiosperms contain about 99.95% of the flowering plants, assuming that there are about 175 species not in this group and about 350,000 that are. While such a clade with a similar circumscription exists in the APG III system, it was not given a name.