There are more than 200 species of Iris.
Most irises grow from thick, underground stems or rhizomes.
A few species are bulbous. An iris flower typically consists of 6 segments. The 3 inner segments, which are generally upright, are referred to as standards. The drooping, outer 3 segments are known as falls. Bearded irises are one of the most popular and widely grown perennials in the home landscape.