Background. Triticum sinskajae A. Filat. et Kurk. was discovered in the early 70th in the last century at the regular reproduction in the Central Asian and Dagestan VIR-stations of T. monococcum samples. Materials and methods. The objects of the study were 4 species of diploid wheat — Triticum urartu Thum. ex Gandil. (lines k-62477, k-62465), Triticum monococcum L. (lines k-20970, k-39471), Triticum boeoticum Boiss. (lines k-59161, k-28132, k-40118) and Triticum sinskajae A. Filat. et Kurk. (line k-48993). Results. We found differences between T. sinskajaeand T. monococcum in the variable region of the histone gene H3.2, and the RAPD analysis showed the presence of unique polymorphic loci in T. sinskajae. Conclusion. In gene ral, T. boeoticum, T. monococcum, and T. sinskajae are most likely to be closely related species of diploid wheat, whereas T. urartu is quite significantly different from them.