The contents and structure of adventive flora element of the Republic of Buryatia and Zabaykalsky region

The data on the results of inventory and regular-ities of formation of adventive flora of the Republic of Buryatia and Zabaykalsky region were provided in the article. Historical aspects of formation of ad-ventive flora were considered. Initial materials for research were received from the extensive report, and numerous primary sources. Adventive types were divided on a way, time of drift and extent of naturalization. It was shown that the number of ad-ventive plants did not depend on a floristic variety of Transbaikal territory. Possibly, it was defined by degree of an urbanization of the territory, a habitant environment, existence of ways of drift or their proximity. As a result of the analysis of adventive flora on the allocated 10 elementary floristic areas 3 large clusters were allocated: mountain, low-mountain and flat. Distribution of adventive views of territories of Transbaikal territory happened accord-ing to the ways of migration of the person on the southeast coast of Baikal and on basins of the large rivers, at the same time drift to mountainous areas happened probably more slowly on valleys of the small rivers. Steppe floristic complex (area UD - 12,5 %) was subjected to the greatest degree of synanthropization.