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Peucedanum guvenianum Yıldırım & H.Duman is described as a species new to science. It is endemic to the West Anatolia region of Turkey. It is known from a single locality in İzmir Province. P. guvenianum shows similarities to P. longifolium, P. ruthenicum, and P. vourinense. Diagnostic morphological characters are discussed and compared with those of closely related taxa. | Turkish Journal of Botany Turk J Bot (2017) 41: 600-608 © TÜBİTAK doi:10.3906/bot-1701-56 http://journals.tubitak.gov.tr/botany/ Research Article Peucedanum guvenianum (Apiaceae), a new species from West Anatolia, Turkey 1, 2 Hasan YILDIRIM *, Hayri DUMAN Department of Biology, Faculty of Science, Ege University, Bornova, İzmir, Turkey 2 Department of Biology, Faculty of Science, Gazi University, Teknikokullar, Ankara, Turkey 1 Received: 27.01.2017 Accepted/Published Online: 16.07.2017 Final Version: 22.11.2017 Abstract: Peucedanum guvenianum Yıldırım & H.Duman is described as a species new to science. It is endemic to the West Anatolia region of Turkey. It is known from a single locality in İzmir Province. P. guvenianum shows similarities to P. longifolium, P. ruthenicum, and P. vourinense. Diagnostic morphological characters are discussed and compared with those of closely related taxa. It is easily distinguished from related species especially by its stem 130–220 cm tall, distinctly striate, densely branched from below the middle to upper part; basal leaves 28–40 cm long and 20–70 cm wide; bracts linear-lanceolate and erect; petals emarginate at apex; mericarp 7.2–14 × 4.3–8 mm, oblong to oblong-orbicular, ±two times longer from pedicel. Key words: Taxonomy, Peucedanum, İzmir, Turkey 1. Introduction The family Apiaceae comprises 100 genera and a total of 505 taxa (477 species) in Turkey, where 167 of the taxa are endemic (Güner et al., 2012). The genera Aegokeras Raf., Ekimia H.Duman & M.F.Watson, Postiella Kljuykov, Microsciadium Boiss., and Crenosciadium Boiss. & Heldr. ex Boiss. are endemic for Turkey (Pimenov and Leonov, 1993). The genus Peucedanum L., represented by ca. 100–120 species and mainly distributed in Eurasia and Africa, is characterized by flattened fruits with well-developed lateral wings and without prominent dorsal ribs (Pimenov and Leonov, 1993; Ostroumova and Pimenow, 1997). It is a very complex and heterogeneous genus in the .