SOME STRUCTURAL FEATURES OF SHOOT SYSTEMS AND CROWN DEVELOPMENT OF THE GENERATIVE <i>TILIA PLATYPHYLLOS (TILIACEAE) </i>TREES OF THREE AGE STATES IN TEMPERATE CONTINENTAL CLIMATE
The structure of the upper crown is studied in generative trees Tilia platyphyllos Scop. of three age states: young, mature, old. The study was made of annual shoots, biennial shoot systems, axes of all orders of branching, branches rising from the trunk. Three types of biennial shoot systems are distinguished, which form the main and skeletal axis in branches and are specific to the certain age states, namely two growth types and one structural type. Changes at different studied levels of the organization are revealed, which lead to the formation of the crown shape characteristic of each generative age state.