Weeds of lawns of Petrodvorets (Saint Petersburg)

The purpose of the study is to identify the feature of the species composition of weeds of lawns in Petrodvorets. Lawn monitoring for weeds, floristic analysis of the obtained data, calculation and assessment of species occurrence were carried out. The analysis revealed 90 species of weed plants from 71 genera and 22 families. Most species belong to 6 families. The main number of genera belongs to 5 families. Perennial species predominate in life expectancy (55.56 %). According to the occurrence indicators, species are distributed according to the classes of constancy (V class - 4, IV - 4, III - 12, II - 25, I - 46 species). A group of 20 dominating species by occurrence was identified (V, IV, III classes of constancy). Identified A group of 25 associated species by occurrence was identified (II constancy classes). It was revealed that 82% of weed plant species dominating the fields of row crops in the Leningrad Region are present to varying degrees on the surveyed lawns