Psephellusvanensis (Asteraceae), a new species from east Turkey.

A new species, Psephellusvanensis A.Duran, Behçet & B.Dogan (Asteraceae) from Anatolia, Turkey, is described and illustrated. The species grows on the serpentine stony field of the village of Çaldiran in the district of Baskale (Van province) in eastern Anatolia. It is morphologically similar to Psephelluspyrrhoblepharus (Boiss.) Wagenitz. Diagnostic characters are discussed, and a key to the most similar species is provided. Ecology, conservation status and notes on biogeography of the species are also presented. In addition, the geographical distribution of the new species and other related species in Turkey is mapped.