Includes many families of monocotyledonous plants like the Orchidaceae, Juncaceae, Cyperaceae, and Commelinaceae. It describes 51 genera and 326 species of the wild, cultivated, as well as adventive plants growing in the European part of Russia and bordering regions, their systematics, habitat conditions, ranges, and chromosome numbers. Also provided are the keys for idintification of the genera and species.