Cousinia kilouyensis, from the SW Iranian province of Boyer Ahmadi va Kohkilouyeh, is described as a species new to science and illustrated. It belongs to C. sect. Leiocaules, which is easily recognized by entirely glabrous, ivory white stems, shining, glabrous, not-decurrent leaves, small heads with few flower and few, lacerate, acuminate-spinose involucral bracts. The new species is compared with the morphologically nearest species, C. quettensis from Afghanistan and Pakistan and C. beauverdiana from Kerman province, Iran.
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