The purpose of this article is the study of morphological features variability elements flowers daylily species (H. middendorffii Trautv. & CA Mey., H. minor Mill., H. dumortieri C. Morr., H. esculenta Koidz., H. citrina Baroni and H. thunbergii Baker) at the introduction into Yakut Botanical Garden. Metric characteristics, received and processed by program PAST, found mostly low and middle variability of biometric features of flowers daylilies. It was found out that the early summer flowering species of daylilies (H. minor, H. middendorffii, H. dumortieri) have low variability of the complex morphological characters, medium- and late flowering species (H. esculenta, H. citrine, H. thunbergii) have an average volatility. A high coefficient of variation of some traits observed in species later timing of flowering: the diameter of the flower, the width of the outer tepals and the length of the perianth tube of H. citrina, the length of the perianth tube and width of the anther of H. esculenta, the width of the anther of H. thunbergii. The qualitative characteristics of daylily flowers are very varied. Monotonous color of the tepals is noted among the plants of H. middendorffii. The rare flowers anomalies are documented, such as the reduction of tepals (to 2) of H. esculenta, the formation of additional leaflets of the inner circle (to 4) of H. esculenta and H. minor; fused filaments of H. esculenta, the different height stigmas location on the styloids of H. middendorffii. The data on the variation of flowers of species Hemerocallis can be used for selection of interesting shapes and expansion of the range of ornamental plants for landscaping in Central Yakutia.