Phytodiversity of Eastern Europe

32-47

Authors: Shcherbakov A.V.

The list of 51 species of vascular aquatic plants, detailed to the level of separate administrative districts or locations, the growth of 49 on the territory of the Yamal-Nenets Autonomous Okrug is confirmed by herbarium collections. In addition, hybrids, species that are known only from literature are listed, as well as those included in the flora of the re-gion by mistake.

55-61

Authors: Savinov I.A.

Current actual data on the distribution of Euonymus europaeus L. in the Middle Russia are presented, with details for individual regions and areas. The materials are based on a critical study of modern literary sources, existing herbarium materials, as well as the author's own field trips. The need for new field studies in a number of areas to clarify the extreme limits of the its distribution at the north-eastern border of its range and confirmation of old collections late 19th century is noted.

66-90

Authors: Stamenov M.N.

From the perspective of the modular concept the variability of crown architecture of virginal and young reproductive individuals of Quercus robur L. has been researched. The individuals grow in phytocenoses of the Upper and Middle Oka river. The plant communities are subdivided into three groups accordingly to their light level (% of the full light): mesophytic meadows (100%), grass birch stands and pineries with small gaps (35–55%), closed canopy pineries (15–30%). The total amount of individuals is 210. In each individual, the configuration, growth and branching of the axes of the main structural units of the crown are considered. Meanings of quantitative parameters of shoot systems were selectively measured. Four architectural types have been distinguished: "Мeadow", "Мargin", "Forest 1", "Forest 2". The individuals of the meadow and margin types grow within the 1st and 2nd light level group communities respectively. The individuals of the forest types grow within the 3rd light level group community. In a series from the meadow type to the forest types ramification of biennial shoot systems simplifies while shape and structure of the branches from the trunk and trunk itself get more complex. Thus we figured out that Q. robur has a significant polyvariance of shoot systems, which leads to formation of qualitatively different types of habitus.