This study concerned the taxonomic revision of Astragalus L. section Onobrychoidei DC in Turkey. The morphological, cytological, and phenological characteristics of 29 species in this section are discussed. | Turkish Journal of Botany Turk J Bot (2015) 39: 708-745 © TÜBİTAK doi: Research Article Taxonomic revision of Astragalus L. section Onobrychoidei DC. (Fabaceae) in Turkey 1 2 1, Murat EKİCİ , Hasan AKAN , Zeki AYTAÇ * Department of Biology, Faculty of Science, Gazi University, Ankara, Turkey 2 Department of Biology, Faculty of Science and Arts, Harran University, Şanlıurfa, Turkey 1 Received: Accepted/Published Online: Printed: Abstract: This study concerned the taxonomic revision of Astragalus L. section Onobrychoidei DC in Turkey. The morphological, cytological, and phenological characteristics of 29 species in this section are discussed. Moreover, 11 names at specific levels are reduced to synonymy: Astragalus eskishehiricus, A. hololeucoides, A. sakaryaensis, A. phanothrix, A. canescens, A. robertianus, A. rausianus, A. tunceliensis, A. pseudovegetus, A. bingoellensis, and A. bithynicus. The conservation statuses based on the IUCN Red List categories are mentioned for endemic taxa. Key words: Anatolia, Leguminosae, systematics synonym, conspectus 1. Introduction The first classification of the genus Astragalus L. (Fabaceae) was presented by Tournefort and followed by de Candolle (1802) for considering several nonvalid series and some sections, including the sect. Onobrychoidei DC. The classification of the genus was divided into eight subgenera and several sections, but ignored the valid names introduced by de Candolle (1802). Therefore, the members of the sect. Onobrychoidei have been classified under the sect. Onobrychium Boiss. for a long time (Bunge, 1868, 1869). Astragalus includes about 2438 species, which are classified into 10 subgenera and 130 sections according to Maassoumi (1998), and 2398 species and 136 sections according to Podlech and Zarre (2013) in the world. Turkey has 63 sections and 457 taxa and the endemism rate is about 51% (Aytaç et al.,
