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Th e ontogeny of Gueldenstaedtia verna (the rare species of Eastern Asia fl oristic region) was studied and the life-form of this species was described. Th e ontogeny duration is more than 35 years. Four periods and nine ontogenic stages are distinguished.

Morphology, areas, composition and content of the fl avonoid aglycons have been studied in A. adsurgens Pallas, A. austrosibiricus Schischkin, A. inopinatus Boriss. and A. onobrychis L. of the section Onobrychium Bunge of the genus Astragalus L. Quercetin and kaempferol were found in composition of the aglycons in A. adsurgens; quercetin, kaempferol, isorhamnetin and rhamnocitrin − in the other species of the section. Th e ratio quercetin/kaempferol in A. adsurgens correlates with diagnostic characters - short bracts and teeth of the calyx. In A. austrosibiricus and A. inopinatus correlation between of their diagnostic characters is weak, there are no in the composition of the fl avonoid aglycons and quantitative relationship. A. onobrychis has an aglycon ratio distinct from other species and clearcut morphological characters.

The results of detailed SEM study of mericarp morphology and surface of Galium verum, G. wirtgenii, G. ruthenicum, G. densifl orum species of the typical section оf the genus Galium (Rubiaceae) are presented. Species G. verum and G. wirtgenii have glabrate surface of mericarp, G. ruthenicum, G. densifl orum have bristly surface of mericarp. Identical netted pericarp sculpture for all species shows their relationship.

Morphology features and seed surface of coat structure of the genus Iris L. were examined using the scaning electron microscope. In seeds of I. humilis present well expressed aril, in seeds of I. tigridia and I. potaninii it is poorly formed but for seeds of I. glaucescens it was absent. Treatment of steam I. glaucescens seeds having of thik cuticle led to the elimination of cuticle.

It is reported on the distribution of new for the Altai Republic species: Vicia hirsuta, Sinapis alba, Senecio vulgaris, Solidago canadensis, Xanthium albinum, as well as the rare for Altai species: Brassica napus, Raphanus sativus, Thladiantha dubia, Centaurea pseudomaculosa, Lapsana communis. It is noted that active distribution and naturalization of Sisymbrium offi cinale and Lactuca serriola take place in the northern parts of the Altai Republic.

In this article the data on 45 endemic and subendemic geophytes of Ferghana valley fl ora is given. Type, habitat and
distribution for any of them are given.

A list of protected and endemic species qualifying the Important Plant Areas (IPA) of the Tuva Republic was compiled.
A database of herbarium specimens and coordinates of their locations for these species was developed. By means of
the database supplemented lists of protected and endemic species for the previously singled out Tuvinian IPA are
compiled, representativeness of the IPA in respect of the given species was estimated, new IPA were proposed.

In this study we determined the concentration of fl avonoids and tannins in Salix alba, S. alba var. vitellina, and S. alba  S. blanda. Th e highest concentrations of these compounds were observed in leaves. In infl orescences, the concentration of fl avonoids and tannins is at maximum during the full bloom; in leaves, during the phase of active growth and in the end of the vegetation period before defoliation.

Th e concentration of 59 macro- and microelements in herbs of 55 species, 34 genera, 13 tribes and 3 subfamilies of family Boraginaceae from diff erent habitats had been determined. Th e eff ectiveness of clade analysis using for study of elements content in plants of Boraginaceae for the purpose of chemosystematics was established. Th e dependence of content of biogenous and abiogenous elements from taxonomical position of species was established. Evolutionary age and phylogenetic connections render the biggest infl uence for microelements spectrum as had been showed. Th e hypothesis about existence of genetically determining of plant elements homeostasis has been spoken out.

Intrazonal grass vegetation of the territory of research is presented by two groups of plant communities. Communities of short-grass cryophitic meadows are presented by three new associations (Cerastio maximi-Salicetum nummulariae ass. nova hoc loco, Antennario lanatae-Arctoetum alpinae ass. nova hoc loco and Diantho repentis-Festucetum ovinae ass. nova hoc loco) which belongs to new alliance Oxytropido sordidae-Tanacetion bipinnati all. nova hoc loco. Subarctic meadows are presented by one new association (Polemonio acutifl ori-Veratretum lobeliani acc. nova hoc loco) which is included in new alliance Polemonio acutifl ori-Veratrion lobeliani all. nova hoc loco.