Subgenus Iris is one subgenus of Iris,The genus was originally classified by Carl Linnaeus, but then further organised by Brian Mathew between 1981 and 1987. It has been divided into six sections; bearded irises (or pogon irises), Psammiris, Oncocylclus, Regelia, Hexapogon and Pseudoregelia. Sections Oncocylclus and Regelia are also called aril irises.