EN
Koeleria species are long-lived bunchgrass native to North America, Eurasia and Africa. Found through open prairie and parkland regions, but less common in open-bush areas. Above genus is considered to be a morphologically complicated one and it is difficult to find any useful characters for discrimination of either the species or the infraspecific taxa (FREY, 1993). The aim of above studies was to define variability of some ecotypes from genus Koeleria for the purpose of further work on selecting material as a turf grass. The analysis of phenological and morphological variation of 11 ecotypes of three species: Koeleria macrantha, Koeleria pyramidata, Koeleria vallesiana were carried on. It was concluded that ecotypes from Koeleria pyramidata are the most homogenous group from all examined. Two groups in Koeleria macrantha species wcre selected on the basis of heading date: very early and very late (difference of mean heading date between – 6.3). Variation observed in three Koeleria species is essential to further experiments and creation of forms with expected turf quality.