A taxonomic synopsis of Klasea Cass. sect. Schumeria (Iljin) L. Martins (Asteraceae, Cardueae) is presented. One new species, K. Khorasanica Ranjbar & Negaresh, collected from Khorasan Province in northeastern Iran, is described and illustrated. Serratula calcarea Mozaff. is transferred here as K. calcarea (Mozaff.) Ranjbar & Negaresh. Also transferred from Serratula L. is K. litwinowii(Iljin) Ranjbar & Negaresh [[ S. litwinowii in contrast to Serratula s. str., for which the base Iljin], which is lectotypified description. The two species are closely related to K. latifolia (Boiss.) L. Martins, lectotypified herein, and characters to distinguish these species are given. A description of Klasea sect.Schumeria, an enumer- somal DNA, from external and internal transcribed ation, and a taxonomic key to its 10 species are provided. The name K. viciifolia (Boiss. & Hausskn.) characters. Klasea ranges from the Iberian Peninsula L. Martins [[ S. viciifolia Boiss. & Hausskn.] is and northern Africa through southern and eastern.
