The results are obtained which expand understanding of the semi-woody plant structure. Ontomorphogenesis and life form of Ziziphora interrupta Juz., growing in Tajikistan, were studied. It was established that the ontogenesis of individuals is simple, incomplete, its duration is at least 14-16 years. The multivariance of ontogenesis is revealed, expressed in the rates of development and omissions of ontogenetic states. The description of the formation shoot showed that the individual is characterized by a basisympodial growth and the formation of the life form of a dwarf subshrub.

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The structure of five Ziziphora interrupta coenopopulations in Tajikistan was described in the article. It was found that most coenopopulations are stable, have a centered ontogenetic spectrum with a maximum on mature generative individuals. This is due to the slow rates rates of plant development in the middle and fast at the beginning and end of ontogenesis. The deviation from the typical centered spectrum is associated with the irregularity of seed renewal and the polyvariant ontogeny of individuals growing on mobile substrates and steepness of slopes. The right-sided spectrum is formed as a result of anthropogenic impact (collection of medicinal raw materials), what leads to a gradual aging of the coenopopulation and its loss from the community.

The article deals with the seasonal rhythm of development of the bulbaceous acrosympodially accreting polycarpic Allium trautvetterianum Regel (the subgenus Melanocrommyum) when growing in the Kulyab Botanical Garden of the Khatlon Scientific Center, Academy of Sciences of Tajikistan in 2010-2015. Duration of vegetation and phenological phases is described. The species is characterized on the phenorhytmotype as a shortgrowing ephemeroid. Influence of weather conditions on duration of phenological pahses is shown. It is established that the rhythm of development completely corresponds to the eastern variant of Mediterranean climate.

Superior/CAPES (finance code 001) to the first author, and financial support from Conselho Nacional de Desenvolvimento Científico e Tecnológico/CNPq (Project "História filogenética e fatores bióticos associados ao endemismo restrito em Angiospermas do Cerrado"/428673/2016-3) to the last author.