Iris albicans, also known as the Cemetery Iris, White Cemetery Iris, or the White Flag Iris, is a species of iris which was planted on graves in Muslim regions and grows in many countries throughout the Middle East and northern Africa. It was later introduced to Spain, and then other European countries. It is a natural hybrid.
It grows to 30–60 cm tal. The leaves are grey-green, and broadly sword-shaped. The inflorescence is fan-shaped and contains two or three fragrant flowers. The flowers are grey or silvery in bud, and are white or off-white and 8 cm wide in bloom. It is a sterile hybrid, and spreads by rhizomal growth and division, as it cannot produce seeds. Source