The relics in vegetation of Baikal Siberia: criteria of their identification and some theoretical aspects

The article contains the data on the relics in vegetation of Baikal Siberia, the most important criteria of their selection are substantiated, such as disjunctions of area, phenological arrhythmia, the presence of historically associated species in biota, ecology-biological and paleogeographic features. The most detailed landscape - ecological and floristic description of vegetation structure has been examplified by the analysis of relic apricot associations Armeniaca sibirica (Г.) Tam of Selenginsk middlemountains in Buryatia.