Ann. Bot. Fennici 48: 145–154 ISSN 0003-3847 (print) ISSN 1797-2442 (online) Helsinki 29 April 2011 © Finnish Zoological and Botanical Publishing Board 2011 Helichrysum unicapitatum (Asteraceae), a new species from Turkey Serdar G. Şenol 1, *, Özcan Secmen 1 , Bintuğ Öztürk 2 & Mercè Galbany-Casals 3 1) Ege University, Faculty of Science, Department of Biology, 35100 Bornova, İzmir, Turkey (*corresponding author’s e-mail: sgsenol@yahoo.com) 2) Ege University, Faculty of Pharmacy, Department of Pharmaceutical Botany, 35100 Bornova, İzmir, Turkey 3) Institut Botànic de Barcelona (CSIC-ICUB), Psg. Migdia s/n, ES-08038 Barcelona, Spain Received 8 Jan. 2009, revised version received 18 Sep. 2009, accepted 22 Sep. 2009 Şenol, S. G., Secmen, Ö., Öztürk, B. & Galbany-Casals, M. 2011: Helichrysum unicapitatum (Asteraceae), a new species from Turkey. — Ann. Bot. Fennici 48: 145–154. Helichrysum unicapitatum S.G. Şenol, Ö. Seçmen & B. Öztürk (Asteraceae) is described and illustrated from the SW province of Anatolia, Turkey. It grows on crys- talline calcareous rocks between Evran Tepe and Karababa Tepe (1800–2300 m), situ- ated within the Denizli Babadağ (Cadmus) Mountain Range. Helichrysum compactum seems to be its closest relative and their affnities are discussed based on morphologi- cal data and DNA sequences (nrDNA ITS and ETS). Introductıon The tribe Gnaphalieae of Asteraceae comprises 185 genera and about 1240 species; it is cos- mopolitan, but most diverse in the southern hemisphere (Bayer et al. 2007). Helichrysum is the largest genus of this tribe, with about 600 species, occurring in Europe, Asia, Africa and Madagascar (Bayer et al. 2007). Since Helichrysum was revised by Davis and Kupicha (1975) and Davis et al. (1988), 18 spe- cies have been recognized in Turkey. Besides these works, one new subspecies and four new species have been described from the country: H. plicatum subsp. isauricum (Parolly 1995), H. kitianum (Yıldız & Kit Tan 1988), H. sivasi- cum (Yıldız & Kit Tan 1988), H. orbicularifo- lium (Sümbül et. al. 2003) and H. yurterianum (Gemici et al. 2008). However, according to Parolly and Eren (2006) H. orbicularifolium is a synonym of H. chasmolycicum. The author M. Galbany-Casals and her colleagues, who are currently working on a taxonomic revision of Helichrysum sect. Helichrysum, think that H. kitianum is a synonym of H. graveolens, H. chionophilum a synonym of H. pallasii, and H. rubicundum should be considered at the species level. After these amendments, the total number of Helichrysum species known from Turkey is 20. Some specimens of Helichrysum originally identifed as H. chionophilum were frst collected by S. Oluk from Denizli (Babadağ), Turkey, in 1996 (EGE 34743). The authors of the present contribution examined that specimen, which lacks fowers and fruits. At frst sight, the basal part looked similar to H. compactum, but the morphology of the capitula and especially the