Plant communities with Fornicium uniflorum (L.) Zuev have been analyzed. Studied species characterized by wide ecological range and grew in meadow and typical steppes, light-coniferous forest. High constancy is observed in meadow steppes with dominating of Filifolium sibiricum, Carex pediformis and Stipa baicalensis. DCA-ordination revealed differences between main types of plant communities with F. uniflorum, described floristic difference of Western and Eastern Transbaikalia phytocoenoses. Eco-topological models showed that plant communities on flat slopes characterized by high species richness and vegetation projective cover. Studied coenopopulations has unsufficient and bimodal age spectra. High number of species individuals after steppe fires can be connected with decrease of species competition that lead to active occupation of territory by F. uniflorum.Key words: Asteraceae, Fornicium uniflorum, plant communities, ordination, hill modeling, coenopopulation structure.