To the introduction of the Dracocephalum jacutense (Lamiaceae) in the Yakut Botanical Garden

Dracocephalum jacutense Peschkova is a narrow-locality endemic to Eastern Siberia, classified in the Red book of the Republic of Sakha (Yakutia) as a rarity category 1 - a species under threat of extinction. Only two locations of the species are known in the vicinity of the village of Sangar in the Kobyai district in the territory of the Sakha Republic. The introduction experiment, which began in 2009, showed the possibility of cultivating the species outside of its natural habitat. Imported specimens from the third year of vegetation go through a full cycle of development of shoots, bloom and give mature seeds. The ontogenesis of D. jacutense was studied on plants obtained from these seeds. In terms of culture, the ontogenesis of the species is complete, 4 periods and 8 ontogenetic states are identified: 1) latent period - fruits (eremes); 2) pregenerative period - seedlings, juvenile, virginal; 3) generative period -young, middle - aged and old generative; 4) postgenerative period - sub-senile and senile. In comparison with natural populations in favorable conditions , the duration of ontogenesis is reduced: the pregenerative period is only one growing season, the generative period is 7-8 seasons, and the postgenerative period is 2-3 seasons. In the old generative ontogenetic state, senile partikulation occurs. Rejuvenation of the obtained particulates does not occur. A critical point in the cultivation of introduced populations is seed propagation due to low seed productivity, since the reproduction of the species occurs then only with the help of seeds.