2.1 Plant sampling
Three accessions of the new species were sampled, with each accession representing one sample point based on distinct locality and/or altitude (Table S1). Twelve StY genome species from the genusRoegneria and 33 diploid taxa representing 19 basic genomes in Triticeae were included in this study, and their DNA sequences for phylogenetic analyses were obtained from published data (Huang et al., 2002; Mason-Gamer, 2004; Fan et al., 2013; Lei et al., 2022) (Table S1). The plants and voucher specimens are deposited at Herbarium of Triticeae Research Institute, Sichuan Agricultural University, China (SAUTI).