Data on the dynamics of the ontogenetic structure of two cоenopopulations (CP) of Dracocephalum fruticulosum located in various ecological and cenotic conditions of Tuva are presented. The changes in the type of the ontogenetic spectrum and the density index of individuals were analyzed. A sharp decrease in density was revealed in both CP during 18 years. The monomodality of the ontogenetic spectrum was established during all the years of our study. There was a change in the type of the cenopopulations, namely, from transient to aging in CP 1 and from transient to mature in CP 2. The calculated demographic indicators and the rate of development reflect the unidirectional dynamics of the CP structure, namely, a successive type in CP 1, and a wave-fluctuation type in CPU 2. CP analysis showed significant vulnerability of demographic indicators. Changes in the coenopopulations are due to different causes: overgrowth of Selaginella sanguinolenta communities in CP 1, anthropogenic impact (grazing) in CP 2, weak seed setting and germination.

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The features development and branching pattern of N. manchuriensis individuals in the conditions of the Far East were studied. It is established that ontogeny consists the ontogeny of the seed individual and the private ontogeny of the ramet. The seed individual pass through the following stages of development: primary shoot-main axis-primary bush-clump-system of partial shoots; ramet: system of partial shoots. Individuals develop according to the sympodial long shooted model of the shoot formation. Basis structure the whole plant is a consistent development of dicyclic rhizomatous-long shoots. The branching pattern is determined by the functioning the buds the first annual growth of the dicyclic shoot. The mechanism of branching occurs according to dychasial type. The geophilic parts of the shoots form a rhizome.

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