Iris cedreti Dinsmore belongs to the Oncocyclus irises, a group of "royal irises" endemic to the Near East and known since antiquity. It grows in the wild on one stretch of the Mount Lebanon range, between 1,200 and 2,000 metres, alongside three other irises found nowhere else but Lebanon. Its single-bloom-per-stem flower stands out for a near-white background entirely veined in dark purple to black, unlike the more evenly coloured garden irises. Growing from a short rhizome rather than a bulb, it goes dormant through summer before flowering again in May. Listed as critically endangered by the IUCN, more than half of its habitat is threatened by the Cedrar project. Doctor Youssef Tawk has spent years working to save it.