The experiment object were 154 sunflower hybrids developed by research institutes and international breeding companies and intended for growing in the agroecotogical conditions of Europe, the Americas, Australia, Asia and Africa. The hybrids were tested for the following characters: plant height, head diameter, number of leaves and the sums of effective temperatures to budding, flowering and maturation. Statistical calcutations included the cluster analysis with the Euclidean distance treated as a metric distance. Despite a large variability in all the characters tested, the majority of the hybrids were grouped in two clusters. An exception in that sense were the sums of effective temperatures io maturity which were grouped in four out of the five clusters.