The ontogenetic structure of the сoenopopulation of Thymus roseus was studied in different conditions of East Kazakhstan. It is established that in the steppes at the foothills and along the mountain tops of the biomorph of the species – monocentric, in the steppes along the slopes of the mountains – implicitly polycentric, in the communities of alpine meadows – explicitly polycentric. In individuals of the species of different biomorphs, biological features have been identified that determine the type of the characteristic ontogenetic spectrum of the coenopopulation. All the investigated coenopopulations are normal, in most cases they are full-membered. Their ontogenetic spectrums basically do not coincide with the characteristic type. Changes in the ontogenetic spectrum are associated with the conditions of growth (lack of a free substratum, high phytocenotic competition) and features of ontogenesis (skipping the mature generative state).Key words: Thymus roseus, life form, сoenopopulation, ontogenetic structure, ontogenetic spectrum, East Kazakhstan.