Two new Cephalaria Schrad. ex Roem. et Schult. species (Caprifoliaceae) from Turkey, Cephalaria davisiana Göktürk & Sümbül and Cephalaria sumbuliana Göktürk, are described and illustrated. A map showing their distribution and other related taxa is given. | R. S. GÖKTÜRK, H. SÜMBÜL, A. ÇELEBİ, L. AÇIK Research Article Turk J Bot 36 (2012) 311-321 © TÜBİTAK doi: Two new species of Cephalaria (Caprifoliaceae) from Turkey Ramazan Süleyman GÖKTÜRK1,*, Hüseyin SÜMBÜL1, Ayten ÇELEBİ2, Leyla AÇIK3 1 Department of Biology, Faculty of Science, Akdeniz University, Antalya - TURKEY 2 Department of Biology, Faculty of Science and Arts, Kırıkkale University, Kırıkkale - TURKEY 3 Department of Biology, Faculty of Science, Gazi University, Teknikokullar, Ankara - TURKEY Received: Accepted: Abstract: Two new Cephalaria Schrad. ex Roem. et Schult. species (Caprifoliaceae) from Turkey, Cephalaria davisiana Göktürk & Sümbül and Cephalaria sumbuliana Göktürk, are described and illustrated. A map showing their distribution and other related taxa is given. The morphological differences of the 2 new species are discussed and comparisons are made with the similar Cephalaria speciosa Boiss. & Kotschy and Cephalaria elmaliensis . & . In addition to morphological observations, C. davisiana, C. sumbuliana, C. elmaliensis, and C. speciosa were analysed by applying RAPD-PCR techniques. RAPD methods clearly distinguished between the new species and the 2 species that they resemble. Key words: Caprifoliaceae, Cephalaria, new species, RAPD-PCR, taxonomy Türkiye Cephalaria (Caprifoliaceae) cinsinden iki yeni tür Özet: Türkiye’den iki yeni Cephalaria Schrad. ex Roem. et Schult. (Caprifoliaceae) türü, Cephalaria davisiana Göktürk & Sümbül ve Cephalaria sumbuliana Göktürk tanımlandı ve çizildi. Bu yeni türlerin ve akraba türlerin yayılışını gösteren bir harita verildi. Yeni türlerin morfolojik farklılıkları, akraba olan Cephalaria speciosa Boiss. & Kotschy ve C. elmaliensis . & ile tartışıldı ve karşılaştırıldı. C. davisiana, C. sumbuliana, C. elmaliensis ve C. speciosa türlerinin morfolojik incelemelerine ilave olarak RAPD-PCR tekniği ile de analizleri .