Ferula mervynii M. Sagiroglu & H. Duman, sp. nov. from north-east Anatolia in Turkey (A8: Artvin & Erzurum) is described and illustrated. It is closely related to F. coskunii H. Duman & M. Sagiroglu, from which it differs mainly in its habit, basal leaves, umbel, and mericarp features. Diagnostic morphological characters are discussed. Notes are also presented on its ecology and conservation status, together with scanning electron micrographs of the surface of the mericarps and of a somatic metaphase plate showing the chromosome number. (c) 2007 The Linnean Society of London, Botanical Journal of the Linnean Society, 2007.