Flora of Tver: dynamics of composition and structure

Dynamics of structure and structure of flora of a city of Tver for the 200-year-old period is analysed. The specific structure natural and adventure components at different stages of a development of the city is revealed. Botaniko-geographical specificity of historical and modern fractions natural and adventure flora components is found out. For the 200-year-old period 1143 kinds of vascular plants are registered (675 natural, 468 adventive). It is lost more than 30% of specific structure of natural flora. The adventivne component of modern city flora (427 kinds) is comparable on volume with natural (479 kinds). Level of specific riches adventive component has increased almost in 4 times, and the number of protected plants has decreased more, than in 4 times. Now 6 plants from the basic list of the Red book of the Tver region and 18 of the additional have remained only.