Centaurea yaltirikii subsp. dumanii subsp. nov. (C. sect. Pseudoseridia, Asteraceae) in Marmara region of Turkey

A new subspecies of Centaureayaltirikii N. Aksoy, H. Duman and A. Efe subsp. dumanii N. Aksoy and A. Efe (C sect. Pseudoseridia Wagenitz, Asteraceae), is described and illustrated with diagnostic characters and taxonomie comments. The characteristics of the new subspecies are compared with those of the type subspecies from which it differs mainly in the hair of the leaves, stomata types, length and width of the pappus and surface of achene. In addition, the geographic distribution of the new subspecies is mapped