First insight into the phylogeny of fine-leaved in the Altai Mountain Country based on genome-wide genotyping.

is one of the largest genera within the Poaceae family. Molecular phylogenies demonstrate that s.l. comprises two groups: broad- and fine-leaved species. The latter is the species-richest and taxonomically complicated group due to being paraphyletic. Here, we provide the first insight into the phylogeny of 17 fine-leaved species of Altai fescues. Based on genome-wide genotyping, the examined taxa were divided into three markedly differentiated clusters. The first cluster comprises species from the complex, the second cluster includes the complex, and the third cluster contains taxa from the groups , , and . Importantly, we detected a complex genetic pattern within the groups of and . Moreover, our findings underline a discrepancy between morphological and molecular data for some species distributed within the Altai Mountain Country. We suggest that in order to validate the current findings on the fine-leaved fescues, additional comprehensive research including morphological, karyological, and molecular methods is required. Nonetheless, our work provides a baseline for further investigations on the genus and studies on the floral diversity of Asia.