Th e results of the study of algal fl ora saltish Lake Listvenki are presented. Th ere are 104 species, varieties of the species
and forms from 6 devisions (Cyanophyta - 13, Bacillariophyta - 75, Dinophyta - 1, Euglenophyta - 4, Chlorophyta -
10, Charophyta - 1). Th e fl ora revealed is analysis ecological and geographical.
On the basis of long-term investigations the data on productivity and variability of bracken Pteridium pinetorum
populations are represented in the paper. Th e forest communities and habitats optimal for bracken growing are
revealed.
A revision of taxonomical structure of the section Crystallophlomis in the genus Primula on the basis of studying the
herbarium collections, supervision over the plants in natural conditions and in the conditions in introduction, with
using of the seed surface sculpture characters and defi nitions of nucleotide sequences of ITS-region of nuclear rDNA
was carried out. Th e conspectus of species of section Crystallophlomis of the genus Primula for fl ora of Russia
including 2 subsections, 4 species and 3 subspecies was made. Th e new subsection Tschuktschorum Kovt. is described,
the new combination is off ered and lectotypus for 1 species was chosen.
In 15.2 % (88 species and subspecies) flower plants of subclass Lamiidae in Siberia have 4 forms of sexual
differentiation: monoecy, andromonoecy, gynomonoecy and gynodioecy. The most frequent form of a sexual
expression is gynodioecy (57 species, 9.8 %). From 19 families are richest with species with sexual diff erentiation
Callitrichaceae, Hippuridaceae, Lamiaceae, Rubiaceae.
The ontogeny, biological characters, ontogenetic structure of coenopopulations of rare species Rhinactinidia
eremophila (Bunge) Novopokr. ex Botsch. (Asteraceae) was studied in Chuyskaya depression in Kosch-Agachskii
region Republic of Altai.
Relationships of crossability among biotypes E. caninus from diff erent points of the area, including morphologically
deviating forms, were studied. Ninety one hybrid plants F1 in 42 cross combinations have been grown up. Data about
morphological features and reproductive properties of hybrids in generations F1 and F2 are obtained. Th e estimation
of inheritance of some morphological characters, important in taxonomy, was carried out. It was shown that
E. caninus as the species is formed not only by typical individuals with the limited range of morphological variation,
but also by the big number of the morphotypes mismatching the standard diagnosis of the species. Some deviating
morphotypes are expedient to classify as varieties of E. caninus s. l.
Additions and changings in the fl ora of Novosibirskaya oblast during last 40 years are observed. New adventive
species and disappearing ones are analysed.
Th e relief of steppe belt of Iyus-Shira depression (400-600 m a.s.l.) is the alternation of plain areas, cuestas and little
ridges. Th e main vegetation of plain areas is polydominant bunchgrass steppe. Th e vegetation of little ridges and
cuestas depends on steepness and exposition of their slopes. On steep sun-exposed slopes short grass petrophytic
steppes are located. On gentle shadowed slopes the herb bunchgrass steppes predominate.
Th e basic types of vegetation communities on Taradanovsky, Azhendarovsky and Saltymakovsky mountain ridges are
described. Th ey belong to 5 associations and 1 community from 4 classes of Braun-Blanquet classifi cation. Th e spatial
structure of every mountain ridge is characterized.
Th e histochemical analysis of the mature ovule was performed in the species of Trollius asiaticus L. and T. ledebourii
Reichenb. Distribution of carbohydrates and RNA/DNA ratio were studied. It was found that halazal nucellus area
had a complex organization, and formed an atypical podium consisting of morphologically different cells.
Histochemical diff erences in them are minimal.
