Abstract
Iris koyuncui, a new species of subgenus Scorpiris, is described and illustrated from Hakkâri Province, Turkey. From the morphological point of view, Iris koyuncui appears to be similar to Iris pseudocaucasica Grossh., but from which it differs in several morphological features including plant height, leaf size/number and flower colour/size. A comprehensive description of this species is provided, including detailed illustrations and photographs, geographical distribution, habitat and ecology, vernacular name and IUCN conservation status.