Phylogenetic relationships among 30 species of sect. Onobrychoidei and some related sections are investigated using nrDNA ITS and morphological data. Based on Maximum Parsimony and Bayesian analyses the morphological characters are useful at the sectional level but not at lower taxonomic ranks. Astragalus sect. Onobrychoidei at the current status is not monophyletic. Some members of the section are well intermixed with members of related sections. Another species of the section, A. oligoflorus, is well allied with species of the sect Erioceras at the base of the resulting phylogenetic trees. Analyses confirmed that debatable species A. goktschaicus and A. scapiger are belonging to the sect. Onobrychoidei. A. huthianus (of sect. Craccina) was also placed within sect. Onobrychoidei and it should be classified as a member of latter section.
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