Th e issue contains research papers of the 23th International Scientifi c and Practical conference«Problems of Botany of South Siberia and Mongolia» in the following directions: geobotany andresource management; study of vegetation in Altai, Siberia and Mongolia; molecular methods ofstudying plants and chemosystematics; morphology and biology of individual species; plant protection;the role of botanic gardens in the study and reservation of plant biodiversity; fl ora of southern Siberia,Mongolia and neighboring countries; plant ecology and phytoindication; systematics of individualFor specialists in the fi eld of botany, ecology, environmental protection and for all interested inquestions of the study, protection and rational use of fl ora.