The features of species composition of weed flora of Krasnoyarsk natural district

The results of generalized survey of the territory of the forest-steppe (Emelyanovsky and Suhobuzimsky districts) and taiga, podtaiga (Kazachinsky and Yenisei districts) of Krasnoyarsk Region are presented. In all areas among weed component the most numerous are the families: Asteraceae Dumort., Brassicaceae Burnett., Poaceae Bernhart., Lamiaceae Lind l; Chenopodiaceae Vent., Caryophyllaceae Juss., Fabaceae Lindl., Polygonaceae Juss. and Boraginaceae Juss., including from 70.2 to 77.9 % of the species, the rest include one or two species. Segetal and segetal-ruderal species account for 38.4-39 % of the total number of weeds. Amongsegmentally-ruderal weeds the most representative are the families Poaceae Bernhart., Asteraceae Dumort., Brassicaceae Burnett., Polygonaceae Juss., Lamiaceae Lindl. Significant differences of structural composition of weeds flora on the area have not been identified. It should be noted that in recent years such species as Galium aparine L., Amaranthus blitoides S. Wats. abundantly grow in the crops of field crops, Erodium cicutarium (L.) L'Her is stable; more frequent occurrences of Chenopodium aristatum L. may be noted. In addition, single plants of Artemisia vulgaris L. are quite common in spring grain crops. Such species as Galium aparine L., Amaranthus blitoides S. Wats. have not been found in the podtaiga zone in surveyed territories of the Yenisei and Kazachinsky districts.