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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.