Yellow-flowering Achillea L. is a group of hardly distinguishable taxa of kind Achillea, which doesn’t have any taxonomic range. At present it includes 5 species: A. micrantha Willd.,
A. biebersteinii Afan., A. leptophylla M. Bieb., A. taurica M.Bieb. and A. micranthoides Klokov. Diagnoses of these taxa were given by single exemplar and without considering intraspecific polymorphism, which as herbarium material and our gather shows, is very wide. Herewith, the most studied taxa have short diagnoses and information about origin of authentic samples is very scant. Description of many taxa adduced by authors of the XIX – XX century is out of sync with protologues of species. Taxonomy of group is very confused as some species have invalid names in literature. For example, name «A. micrantha» presents three taxa with different signs. Two of them were described by C.L. Willdenow (1789, 1804) and one was described by M. Bieberstein. Afterwards, taxon described in 1804, got name «A. biebersteinii» in 1961, taxon of 1808 doesn’t still have a valid name. Herbarium samples and material of our gather show high similarity of the species under study. Analysis of qualitative signs doesn’t allow to make a clear board between taxa as examples with an eclectic set of characters are often come across. Assuming that taxa of the group don’t differ authentically we can conclude that A. biebersteinii, A. leptophylla and A. taurica should be regarded as synonyms A. micrantha. Just one taxon – A. micranthoides – shows a greater degree of self-support authentically differing from the other species with a range of signs (including signs of generative organs) and so it can be regarded as a separate taxon.