Ontogeny essential oil plant Monarda didyma L. in the conditions of Omsk region

This article examines the life form and ontogeny specifics of the advanced essential oil variety of Oswego tea ( Monarda didyma L. ) in conditions of West Siberia. The manuscript defines and characterises four ontogeny periods (latent, pre-generative, generative, and post-generative) and ten conditions of the plant (dormant seeds, seedlings, juvenile, immature, virginal, young generative, middle-generative, generative old, sub-senile, senile), also includes illustrations of those periods. During the first year of live varieties of Oswego tea completes two ontogeny periods (latent, pre-generative) and has four conditions (seedlings, juvenile, immature, virginal). First-year plant life varies from 165 to 174 days; the generative period is 3-5 years. Synflorescence of the plant is a closed truss type with 3-9 frondose-bract form capituliform or spicigerous thyrsus, which has a shape of sub-opposite multi-layered dichasial cyme. Young and middle-generative varieties represented by a flower bed. The third and the fourth year of the generative old condition of the plant can be characterised by full particulation and as a period when the slope is emerging. Over the final two or three years of the post-generative period, variety starts dramatically ageing. It was found that the average plant life of M. didym in Omsk region is 7-9 years. The research has revealed that in the course of the individual development in the regional soil and climate conditions the plant covers full ontogeny and builds elongaterhizome-taproot life form, the main structural unit of which is a forked dicyclic elongate orthotropic stem with a full and semi-full development cycle.