Coefficients of originality of Hippophae rhamnoides L. by phenological dates.

Sea buckthorn is often perceived and used precisely as a fruit crop, but it also has decorative qualities. When choosing varieties for gardening, it is important to know the phenological dates of the onset of decorative phases, but literary sources often indicate only one phenophase - the period of fruit ripening. The purpose of this work is to analyze 18 varieties of sea buckthorn of the average ripening period according to the degree of originality of the onset of a number of phenophases. Female sea buckthorn plants are in the collection of the Main Botanical Garden. N.V. Tsitsina (Moscow, Russia). Annually from 2014 to 2019, 16 phenodates were noted (swelling and blooming of buds, appearance and blooming of leaves, complete leafing, yellowing of leaves, leaf fall, beginning of budding, mass budding, beginning of flowering, mass and end of flowering, fruit setting, single ripening, mass ripening , fruit fall). Originality coefficients were calculated by a statistical method for assessing the modality weight. It was found that among the varieties of the average ripening period, the Chuiskaya and Gus-Khrustalnaya varieties have a high degree of originality of the complex of phenological dates, and the overwhelming majority of varieties are the most typical in the sample. Keywords: HIPPOPHAE RHAMNOIDES L., ORNAMENTAL PLANTS, ORIGINALITY, VARIETY, SEA BUCKTHORN, PHENODATES, PHENOLOGY