Abstract
In the course of field research, analysis of previously published works and review of materials stored in well-known collection funds of Siberia (LE, NS, HGU), information on the distribution of rare adventitious and native plant species in the Upper Yenisei basin was clarified. For the first time, Chenopodiastrum badachschanicum, Galinsoga quadriradiata, Knautia arvensis, and Polygonum rectum were noted for the flora of the Republic of Tuva. Amaranthus albus, Festuca gigantea turned out to be new for the flora of the Sayano-Shushensky Reserve. In 11 rare species, new locations were noted and range boundaries were specified: Aconogonon diffusum, Amaranthus albus, Astragalus suffruticosus, Ciminalis squarrosa, Fagopyrum esculentum, Heteropappus biennis, Lappula tuvinica, Linaria melampyroides, Platanthera fuscescens, Portulaca oleracea, Potentilla virgata, and Rosa majalis. 
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