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Ключевые слова: Spiraea, фенолкарбоновые кислоты, коричная кислота, флавоноиды, флавонолы, кверцетин, кемпферол, изорамнетин. Key words: Spiraea, phenolic acids, cinnamic acid, flavonoids, flavonols, quercetin, kaempferol, isorhamnetin.Поступило в редакцию 11.04.201311.04. Submitted 11.04.2013 from natural and introduced populations were studied by HPLC. The total phenolic content of samples ranged from 3 to 7% of dry weight, flavonoids 43 content was 1-2%. The representatives of the subgenus Protospiraea are characterized a relatively uniform phenolic composition combining phenolic acids and flavonoids, from 50% to 90% of the latter is quercetin. The rest of the flavonoids is kaempferol, in some species there are kaempferol and isorhamnetin. The baseline and the most primitive species of the subgenus Metaspiraea on phenolic composition are S. media and S. flexuosa as the most similar to the species of the subgenus Protospiraea. Spiraea ussuriensis, S. elegans, S. trilobata, S. crenata seem as the most highly evolved species, these contain aglycone AII or cinnamic acid. The ratio of quercetin, kaempferol and cinnamic acid is considered as the main marker of natural groups within the subgenus Metaspiraea. Four types of phenolic composition in the samples of S. chamaedryfolia, S. ussuriensis, S. flexuosa and S. elegans are revealed: the composition with the dominance of quercetin (S. ussuriensis), kaempferol (S. elegans), cinnamic acid (S. chamaedryfolia) and without obvious dominance (S. flexuosa). This is the reason to consider all four taxa as independent species. Significant differences in the phenolic composition of S. humilis and S. salicifolia were found to give consideration to S. humilis as separate species. Any characters of unique for S. sericea is not found. Any characters of the section Glomerati separating the S. hypericifolia from other studied species of the subgenus Metaspiraea is not revealed. In S. nipponica, the characters of the section Chamaedryon are found.

We studied the leaves of Begonia grandis Dryand. subsp. grandis, the northernmost and most cold-resistant representative of the predominantly tropical genus Begonia, by histochemical methods. In glandular and nonglandular trichomes as well as in the epidermal cells of B. grandis Dryand. subsp. grandis leaves, phenolic compounds, including flavonoids, as well as terpenoids and carbonyl compounds were detected. The patterns of phenolic compounds in the acetone and ethanol leaf exudates and in leaves as a whole were similar and contained oxalic, citric, and gallic acids, isoquercitrin, and orientin. Concentrations of phenolic compounds in the acetone and ethanol exudates constituted 0.10 % and 2.59 % of all phenolic compounds in the leaves, respectively. Antimicrobial effects of the aqueous ethanol extract and of the ethanol exudate against reference strains of Bacillus subtilis, Staphylococcus aureus, and Candida albicans were detected at the disc con tents of 50.0 and 45.8 μg, respectively. The observed set of characteristics can be used in a targeted search for highly antimicrobial species of Begoniaceaе.