Hybridization is an important part of species evolution. The hybrid progeny population had rich genetic and phenotypic variation, which made the boundaries between them and their parents blurred and difficult to distinguish. There was little research on the origin of natural hybrids of Triticeae. In this study, we found a large number of putative hybrids of Roegneria in West Sichuan Plateau, China. The hybrid plants showed strong heterosis in plant height, tiller number and floret number. Morphologically, the putative hybrids showed intermediate of Roegneria stricta Keng and Roegneria turczaninovii (Drob.) Nevski. Hybrids had 28 chromosomes corresponding to that of R. stricta and R. turczaninovii (2n=4x=28). Meiotic pairing in hybrids were less regular than those of R. stricta and R. turczaninovii. GISH analysis showed that the hybrid plants had the same genome as that of R. stricta and R. turczaninovii (StY). Phylogenetic analysis based on the single copy nuclear gene DMC1 and chloroplast gene rps16 showed the plants were closely related to R. stricta and R. turczaninovii. This study indicated that the plants were hybrids of R. stricta and R. turczaninovii. The results provided data for the utilization of hybrid. This study provided a case study of natural hybrids.