The inflorescences are in the shape of a fan and contain one or more symmetrical six-lobed flowers. The bulbous species have cylindrical, basal leaves. The rhizomatous species usually have 3–10 basal sword-shaped leaves growing in dense clumps. They have long, erect flowering stems which may be simple or branched, solid or hollow, and flattened or have a circular cross-section. Irises are perennial plants, growing from creeping rhizomes (rhizomatous irises) or, in drier climates, from bulbs (bulbous irises). Illustration of an iris flower with highlighted parts of the flower Three Iris varieties are used in the Iris flower data set outlined by Ronald Fisher in his 1936 paper The use of multiple measurements in taxonomic problems as an example of linear discriminant analysis. dichotoma) are currently included in Iris. tuberosa), and Pardanthopsis (vesper iris, I.
domestica), Hermodactylus (snake's head iris, I. The often-segregated, monotypic genera Belamcanda (blackberry lily, I. A common name for some species is 'flags', while the plants of the subgenus Scorpiris are widely known as ' junos', particularly in horticulture. As well as being the scientific name, iris is also widely used as a common name for all Iris species, as well as some belonging to other closely related genera. Some authors state that the name refers to the wide variety of flower colors found among the many species. It takes its name from the Greek word for a rainbow, which is also the name for the Greek goddess of the rainbow, Iris. Iris is a genus of 260–300 species of flowering plants with showy flowers.
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