dietes bicolor (variously known as african iris or fortnight lily) is a clump-forming rhizomatous perennial plant with long sword-like pale-green leaves, growing from multiple fans at the base of the clump. this species belongs to the iridaceae (iris) family. it can form large clumps if left undisturbed for years. this species is common in horticulture in its native south africa, where it is often used in public gardens, beautification of commercial premises and along roadsides.