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Hypericum sechmenii (Seçmen's St John's wort) is a rare species of flowering plant in the St John's wort family that is found in Eskişehir Province in central Turkey. It was first described and assigned to the genus Hypericum in 2009, and was later placed into the section Adenosepalum. H. sechmenii is a perennial herb that grows 3 to 6 centimeters (1 to 2 inches) tall and blooms in June and July. The stems of the plant are smooth and hairless, while the leaves are leathery and lack leafstalks. Its flowers are arranged in corymbs, and each has five bright yellow petals. Similar species are H. huber-morathii, H. minutum, and H. thymopsis. Found among limestone rocks, H. sechmenii has an estimated distribution of less than 10 square kilometers (4 square miles), with fewer than 250 surviving plants. Despite containing druse crystals and toxic chemicals that may deter herbivory, the species is threatened by overgrazing, as well as climate change and habitat loss.