Studying the phenology of Cardiocrinum cordatum var. glehnii growing in the vicinity of Yuzhno-Sakhalinsk

This study aims to study the processes of wilting of narrow-leaved (first year) seedlings and heart-leaved (second year) seedlings of relic plant Cardiocrinum cordatum after the flowering phase, as well as to study the factors affecting the number of Sakhalin (northern) population of Cardiocrinum cordatum, growing in the neighborhood of Yuzhno-Sakhalinsk. Yuzhno-Sakhalinsk and at the expositions of the Sakhalin branch of the Botanical Garden-Institute of the Far East Branch of the Russian Academy of Sciences (BSI FGBN FEB RAS). The scientific significance of this study lies in the establishment of approximate dates of the end of vegetation of singleleaved seedlings, i.e. determination of the start and end dates of wilting of seedlings of the first and second years of life of Cardiocrinum cordatum. Consequently, the values given in this scientific work will help to form new knowledge about the main features of vegetation of the relic plant, which directly affect the regulation of the number of Sakhalin populations of Cardiocrinum cordatum. As a result of the study, new data on the dynamics of wilting of plants of different age categories were obtained, as well as, an extremely rare phenomenon of fasciation was registered and described, which was not previously noted in scientific sources.