Hypericum formosissimum

Hypericum formosissimum is a species of flowering plant in the St John's wort family Hypericaceae. Found in the cracks of limestone rocks, it is a small perennial herb that grows in a pillow-like shape, has yellow flower petals, and blooms in the late summer. The plant is rare and has a limited habitat in Turkey, Armenia, and Azerbaijan. It is threatened by rock collapses, urbanization, and road construction; it is not protected by conservation efforts.

The species was first described as Hypericum formosum by Soviet-Armenian botanist Armen Takhtajan and was later excluded from a genus-wide monograph of Hypericum by English botanist Norman Robson. When the species was reviewed by Robson, he was uncertain whether it belonged in section Origanifolia or section Adenosepalum. In a 2013 online publication, Robson placed the species in a Hypericum huber-morathii group within section Adenosepalum alongside several related species.